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Introduction to Convert String to Double in C#

In C#, almost all types of data can be converted to any other type. In the same way, we can convert a string to double using a method present inside the “Convert” class called ToDouble() method. There are many overloaded forms of this method and among those overloaded forms, we have two forms to convert a string representation of a number to its equivalent double-precision floating-point number.

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Those two overloaded forms are as follows:

ToDouble(String);

ToDouble(String, IFormatProvider);

Both these methods return a double value after converting the string value to double.

Syntax with Explanation:

The syntax of Convert.ToDouble() method in both its overloaded forms for converting a string to double is as follows:

public static double ToDouble(string strValue);

In the above syntax, ToDouble() method takes one argument of type string (strValue) which is nothing but a string containing a number to convert to double.

public static double ToDouble(string strValue, IFormatProvider provider);

In the above syntax, ToDouble() method takes two arguments; the first is the string representation of a number which needs to be converted to double and second is an object which provides culture-specific formatting information. After conversion both these methods return the equivalent double value for the string passed as the argument.

How to Convert String to Double in C#?

In C#, the “System” namespace contains a class called “Convert” which contains the ToDouble() method in many overloaded forms to convert the specified type of data to its equivalent double value. Among these overloaded forms, two forms allow us to convert a string representation of a number to its equivalent double-precision floating-point number.

These two forms are as follows:

1. ToDouble(String);

Let us understand the working of the above method with the help of the below example:

double doubleVal = Convert.ToDouble("855.65");

In the above statement, we have passed a number i.e. “855.65” as a string to ToDouble() method which will be converted to double by the method and the resulted value will be stored in a variable of type double (doubleVal).

2. ToDouble(String, IFormatProvider);

Let us now understand the working of the above method with the help of the below example:

NumberFormatInfo provider = new NumberFormatInfo(); provider.NumberDecimalSeparator = "."; provider.NumberGroupSeparator = ","; double doubleVal = Convert.ToDouble("855.65", provider);

In the above statements, we first created an object of IFormatProvider using the class NumberFormatInfo which implements IFormatProvider. Then, we set some important properties for this object like NumberDecimalSeparator and NumberGroupSeparator.

NumberDecimalSeparator is used to get or set a string that can be used as the decimal separator in numeric values.

NumberGroupSeparator is used to get or set a string that separates groups of digits at the left of the decimal in numeric values.

Now, Convert.ToDouble() method will convert the given string to double using the formatting information provided by the object of NumberFormatInfo and the resultant value will be stored in the variable “doubleVal”.

If the value of the string in both of the above methods is “null” then these methods will return zero.

In C#, there exists another common way of converting a string to double which can be done by using Double.Parse() method and Double.TryParse() method.

Double.Parse(String) method works similarly to Convert.ToDouble() method as it takes a string representation of a number as an argument and converts it to a double-precision floating-point number. The difference is that if the string is “null” then this method does not return zero instead it returns ArgumentNullException.

Double.TryParse(String, Double) method works the same as Double.Parse() method except it returns a Boolean value which indicates whether the conversion has been done successfully or not. On success, it returns true and the respected double value gets stored in the ‘out’ parameter.

Examples of Convert String to Double in C#

Example showing the conversion of string to double using Convert.ToDouble() method.

Example #1

Code:

using System; using System.Globalization; namespace ConsoleApp4 { public class Program { public static void Main(string[] args) { string[] strValues = {"85545.624", "34567.6790", "5689.1234"}; double doubleVal = 0; try { NumberFormatInfo provider = new NumberFormatInfo(); provider.NumberDecimalSeparator = "."; provider.NumberGroupSeparator = ","; Console.WriteLine("Equivalent double value of " + "specified strings: "); for (int i = 0; i < strValues.Length; i++) { doubleVal = Convert.ToDouble(strValues[i], provider); Console.WriteLine("{0}", doubleVal); } Console.ReadLine(); } catch (Exception ex) { Console.WriteLine(ex.Message); Console.ReadLine(); } } } }

Output:

Example #2

Example showing the conversion from string to double using Double.TryParse() method.

using System; using System.Globalization; namespace ConsoleApp4 { public class Program { public static void Main(string[] args) { string[] strValues = {"2,6893.57", "$2,6893.57", "-2.948e6", "-1.79769313486232E+308", "456BE6", null, String.Empty, "JKLMN"}; Double doubleVal = 0; Console.WriteLine("Equivalent double value of " + "specified strings: "); Console.WriteLine("n"); for (int i = 0; i < strValues.Length; i++) { if (Double.TryParse(strValues[i], out doubleVal)) else Console.WriteLine("Not able to convert '{0}'", strValues[i]); } Console.ReadLine(); } } }

Output:

Example #3

Example showing scenario when the string to be converted to double is either ‘null’ or empty.

Code:

using System; using System.Globalization; namespace ConsoleApp4 { public class Program { public static void Main(string[] args) { string[] strValues = {null, String.Empty}; Double doubleVal = 0; NumberFormatInfo provider = new NumberFormatInfo(); provider.NumberDecimalSeparator = "."; provider.NumberGroupSeparator = ","; Console.WriteLine("Result of conversion using " + "Double.TryParse() method: "); Console.WriteLine("n"); for (int i = 0; i < strValues.Length; i++) { if (Double.TryParse(strValues[i], out doubleVal)) { } else { Console.WriteLine("Not able to convert '{0}'", strValues[i]); } } Console.WriteLine("Result of conversion using " + "Convert.ToDouble() method: "); Console.WriteLine("n"); try { for (int i = 0; i < strValues.Length; i++) { doubleVal = Convert.ToDouble(strValues[i], provider); } Console.ReadLine(); } catch(Exception exception) { Console.WriteLine(exception.Message); Console.ReadLine(); } } } }

Output:

Conclusion

String value can be converted to double using Convert.ToDouble() or Double.Parse() method.

These methods take string representation of a number as input and return its equivalent double-precision floating-point number.

Both these methods return FormatException if the string argument doesn’t represent the number in a valid format.

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Split() String Method In Java: How To Split String With Example

What is split() string in Java?

StrSplit() method allows you to break a string based on specific Java string delimiter. Mostly the Java string split attribute will be a space or a comma(,) with which you want to break or split the string

split() function syntax public String split(String regex) public String split(String regex, int limit) Parameter

Regex: The regular expression in Java split is applied to the text/string

Limit: A limit in Java string split is a maximum number of values in the array. If it is omitted or zero, it will return all the strings matching a regex.

How to Split a String in Java with Delimiter

Below example shows how to split string in Java with delimiter:

Suppose we have a string variable named strMain formed of a few words like Alpha, Beta, Gamma, Delta, Sigma – all separated by the comma (,).

Here if we want all individual strings, the best possible pattern would be to split it based on the comma. So we will get five separate strings as follows:

Alpha

Beta

Gamma

Delta

Sigma

Use the string split in Java method against the string that needs to be divided and provide the separator as an argument.

In this Java split string by delimiter case, the separator is a comma (,) and the result of the Java split string by comma operation will give you an array split.

class StrSplit{ public static void main(String []args){ String strMain = "Alpha, Beta, Delta, Gamma, Sigma"; String[] arrSplit = strMain.split(", "); for (int i=0; i < arrSplit.length; i++) { System.out.println(arrSplit[i]); } } }

The loop in the code just prints each Java split string to array after the split function in Java, as shown below-

Expected Output: Alpha Beta Delta Gamma Sigma Example: Java String split() method with regex and length

Consider a situation, wherein you require only the first ‘n’ elements after the split function in Java but want the rest of the string to remain as it is. An output something like this-

Alpha

Beta

Delta, Gamma, Sigma

This can be achieved by passing another argument along with the split() string in Java operation, and that will be the limit of strings required.

Consider the following code of split method in Java –

class StrSplit2{ public static void main(String []args){ String strMain = "Alpha, Beta, Delta, Gamma, Sigma"; String[] arrSplit_2 = strMain.split(", ", 3); for (int i=0; i < arrSplit_2.length; i++){ System.out.println(arrSplit_2[i]); } } } Expected Output: Alpha Beta Delta, Gamma, Sigma How to Split a string in Java by Space

Consider a situation, wherein you want to split a string by space. Let’s consider an example here; we have a split string Java variable named strMain formed of a few words Welcome to Guru99.

public class StrSplit3{ public static void main(String args[]){ String strMain ="Welcome to Guru99"; String[] arrSplit_3 = strMain.split("\s"); for (int i=0; i < arrSplit_3.length; i++){ System.out.println(arrSplit_3[i]); } } } Expected Output: Welcome to Guru99

 

How To Reverse A String In Python In 5 Ways?

Python is one of the most popular programming languages used in various domains such as data science, web development, and automation. One of the fundamental operations in programming is reversing a string, and Python provides several ways to achieve this task. Reversing a string in Python is a basic operation that every Python developer should be familiar with, and in this guide, we will explore python reverse string!

Why Do We Need Python Reverse String?

The ability to reverse and return string is not only useful in programming but can also come in handy in everyday life. For example, you may want to reverse the order of characters in a string to create a palindrome, which is a word that is the same when read forwards and backwards. Or, you may want to reverse the order of words in a sentence to get a different perspective on its meaning. Whatever your reason for wanting to reverse a string, python provides many ways to do it.

In this article, we’ll go over five distinct approaches to string reversal in Python, each having pros and cons. Starting with the simplest and most direct method—using slicing to reverse the string—we’ll move on to more complex strategies, such employing built-in functions and recursion. We’ll also go through the time and spatial complexity of each strategy along the way so you can pick the one that best suits your requirements. We’ll also include code samples and detailed instructions for each method so you can follow along and practice the skills yourself.

Whether you’re a beginner just starting with Python or an experienced developer looking for a new perspective, this guide has something to offer. By the end of this guide, you will have a better understanding of the different ways to reverse a string in Python, and you’ll be able to choose the most appropriate approach for your specific use case. So, let’s dive into the world of Python string reversal and discover the many ways to do it!

Challenges for Reversing a String in Python How to Reverse A String in Python?

There are several ways to reverse an input string in Python, including using loops, slicing, recursion, and built-in methods. In this guide, we will explore five methods that can be used to reverse a string in Python.

1. Using a Loop

One way to reverse a string is to use a loop. We can iterate over the string from the end and add each character to a new string in reverse order. Here’s an example:

This code iterates over the original string from the last character to the first, adding each character to a new string. The range() function is used to create a sequence of indices in reverse order. You can also utilize the ‘while loop’ in this method.

2. Using Slice Operator

Another way to reverse a string is to use the extended slice syntax of the slice operator. We can slice the string with a step of -1, which reverses the order of the characters. Here’s an example:

This code uses slicing to create a new string that is a reversed version of the original string. The [::-1] notation means to slice the string from the end to the beginning with a step of -1.

3. Using Recursion

We can also use recursion to reverse a string. Here’s an example:

This code uses a recursive function to reverse the string. The function returns the output by checking the length of the string and returns the empty string if the length is 0. Take a note when you return a string, otherwise, it calls itself with a slice of the string that excludes the first character and concatenates the first character to the end of the result.

4. Using join() and reversed()

We can also use the built-in join() and reversed() functions to reverse a string. Here’s an example:

This code uses the reversed() function to create a reverse iterator over the characters in the string, and then joins the characters together using the join() function calls.

5. Using List Comprehension

We can also use list comprehension to reverse a string. Here’s an example:

This code uses a list comprehension to create a Python list of the reversed characters in the string, and then joins the characters together using the join() function.

Method 1: Reversing a String Python by Method A

Define the string to be reversed.

Create an empty string to hold the reversed string.

Iterate through the original string in reverse order to print the end of the string first.

Append each character to the new string.

Print the reversed string.

Code for Reversing a String Using Loop Output Process of Reversing a String Using Loop

Define the original string: Set the original string as “Hello World.”

Create an empty string: Initialize an empty string called “reversed_string” to hold the reversed string.

Iterate through the original string in reverse order:

Start a for loop using the range() function.

Set the starting index as len(string)-1, which is the index of the last character in the string.

Set the ending index as -1, indicating that we iterate up to but not including the first character.

Set the step value as -1 to iterate in reverse order.

Append characters to the new string:

Inside the loop, use the += operator to append each character to the reversed_string.

The += operator is shorthand for reversed_string = reversed_string + string[i], where string[i] represents the current character in the iteration.

Print the reversed string: Use the print() function to display the reversed string.

Method 2: Reversing a String Python by Method B

Define the string to be reversed.

Slice the string from the last character to the first character.

Print the reversed string.

Code for Reversing a String Using String Slicing Output

dlroW olleH

Details on the Process

Define the original string: Set the original string as “Hello World.”

Use string slicing:

Apply string slicing to the original string using the syntax string[start:stop:step].

Set the step value as -1 to slice the string in reverse order.

Since we don’t specify the start and stop indices, Python uses the default values of 0 and the length of the string, respectively.

Retrieve the reversed string: The string slicing operation will extract the reversed version of the original string.

Print the reversed string: Use the print() function to display the reversed string.

Conclusion

In conclusion, we have discussed five Python reverse string methods to reverse a string in Python code. These methods include:

Loops,

String slicing,

Recursion,

Built-in methods.

To learn more about reversing a string in Python, you can use audiovisual resources such as video tutorials and interactive courses. Analytics Vidhya (AV) is a leading platform for data science and machine learning enthusiasts to learn, share, and collaborate on various data science and analytics-related topics. They offer a wide range of resources, including articles, tutorials, courses, and competitions, that can help you learn more about reversing a string in Python.

Here are some ways Analytics Vidhya can help you learn about this topic:

Articles: AV offers a vast library of articles on various topics like data type, data science, data structures, and analytics. You can find several articles on string manipulation in Python, including how to reverse a string. These articles cover various methods, including the ones discussed in this guide, and provide step-by-step instructions on how to implement them.

Tutorials: AV also offers several tutorials on Python programming, including string manipulation. AV also offers several Python tutorials, including string manipulation. After watching a Python tutorial and exercises, you can practice and apply what you have learned.

Frequently Asked Questions Related

Rust In, C And C++ Out Of Microsoft! For The Sake Of Security

It’s time to halt starting any new projects in C/C++ and use Rust, says Microsoft’s Azure CTO

Mark Russinovich, Microsoft’s Azure CTO, says that C and C++ should not be used for new projects. “It’s time to halt starting any new projects in C/C++ and use Rust for those scenarios where a non-GC language is required. For the sake of security and reliability, the industry should declare those languages as deprecated,” he said on Twitter, expressing a personal opinion rather than a new Microsoft policy. Russinovich’s remarks are notable because Microsoft’s core products, such as Windows, Office, and SQL Server, are largely written in C and C++. So too is Linux, which also has widespread use on the Azure cloud platform. That said, it will soon be possible to write parts of the Linux kernel in Rust, judging by reports from the recent open source summit and an email from Linux creator to journalist Steven Vaughan-Nichols in which he said: “Unless something odd happens, it [Rust] will make it into 6.1.” Rust and C++ are two popular systems programming languages. For years, the focus of C++ has been on performance. Microsoft has been increasingly hearing calls from customers and security researchers that C++ should have stronger safety guarantees in the language. C++ often falls behind Rust when it comes to programming safety. Visual Studio 2023 version 16.7 contains four new rules in C++ Core Check to incorporate some safety features from Rust into C++. This is not the first time Microsoft has championed Rust to improve software security. Three years ago the Microsoft Security Response Center (MSRC) stated “we think that Rust represents the best alternative to C and C++ currently available.” The MSRC team also said that “roughly 70 percent of the security issues that the MSRC assigns a CVE to are memory safety issues. This means that if that software had been written in Rust, 70% of these security issues would most likely have been eliminated.” According to Microsoft, about 70% of the CVEs it has patched since 2006 are due to memory safety issues. Eliminating those bugs would dramatically improve software security while reducing the cost of vulnerability remediation. Apple, Amazon, Google, Meta, and Microsoft, amongst many others, use Rust in some capability or manufacturing. Cloudflare lately gushed about Pingora, its new HTTP proxy constructed utilizing Rust, which has boosted efficiency and lower CPU and reminiscence utilization. Rust appears much less susceptible to potential reminiscence corruption bugs and this makes software programs much less weak. Microsoft has been speaking about dumping C/C++ and exploring Rust at least since 2023 and has been growing its personal cloud-oriented reminiscence-protected programming language known as Undertaking Verona. So Russinovich’s name to deprecate C/C++ shouldn’t be without precedent. Rust is not always memory-safe. Using the unsafe keyword, Rust developers can dereference raw points, call dangerous functions, write to mutable static variables, and more. This is necessary at times; but by isolating such code into specifically marked blocks, Rust improves on C or C++ in this respect. Despite these prominent voices supporting Rust, the language trails well behind both C and C++ in usage surveys such as the Redmonk language rankings, which places C++ 7th, C 10th, and Rust in 19th.

Seeing Double: Bu Twins To Row In Head Of The Charles

Seeing Double: BU Twins to Row in Head of the Charles Kerri and Kelli Wegner compete in women’s championship eights

Kerri (from left) and Kelli Wegner with teammates Caroline Pickett (CGS’15) and Alexandra Campillo (SMG’17) during an early morning practice. Photos by Cydney Scott

When Kelli and Kerri Wegner take to the Charles River every morning, the words of encouragement they hear from their teammates on the Boston University women’s rowing team are the same.

“Yeah, Wegners!” their teammates cheer. “Use that strength!”

Being called collectively by their last name doesn’t bother the two rowers. They are used to it. The identical twins are united not just by DNA, but by a passion for rowing.

The two grew up in Saratoga, N.Y., and not only row in the same boat, but live together as well. While that kind of togetherness might be a problem for some sisters, these two wouldn’t have it any other way.

“It doesn’t affect us,” Kelli says. “We don’t get in fights. We’re best friends.”

Now, Kerri and Kelli are hoping they can use that chemistry to propel them and their teammates to a strong finish during this weekend’s Head of the Charles regatta, the world’s largest rowing event, celebrating its 50th anniversary this year.

“When you’re twins and you think alike and you try to perform the same way, obviously it will affect your rowing style,” Kelli says. “It’s definitely unique, because I always know what she’s thinking. It helps knowing that someone always has your back.” Kerri says that she is able to say things to her sister she wouldn’t feel comfortable saying to other teammates, who might think she was trying to coach them. “We’ll say things to each other, but we don’t get mad at each other.”

“It’s way better to have them together than apart,” says women’s rowing head coach Stacey Rippetoe. “Not that apart they’re bad. It’s just that Kelli and Kerri work really well together. It’s almost like there’s more than two people when they’re together, because there’s this synergy that works.”

The two competed in last year’s Head of the Charles. Out of 42 boats, theirs finished 22nd in the women’s championship eights competition, leaving them one spot short of qualifying for this year’s regatta. Fortunately, they were able to enter the race after a random drawing.

“Time management was a big thing for me,” Kerri acknowledges. “We have our practice times, lift and solo workouts. We have academics, reviews, tutorials, so at the beginning of last year I looked at all the things I had to do and thought, how am I going to get this done? This year I feel way less stressed about that.”

One of the biggest challenges for both women when they arrived at BU was adjusting their rowing technique to mesh with that of the others on the team. The technique—what Rippetoe calls the BU stroke—requires slight modifications that help to improve the scull’s speed. It takes time to master, and the Wegners have come a long way.

“I think it’s a work in progress,” Rippetoe says. “Not just for Kelli and Kerri, but for all the rowers. Everyone on the boat wants to go as hard as they can and move the boat as well as they can. But the team needs to understand that they have to balance that with patience so they’re able to change the way they’re rowing.”

“It takes a lot of focus,” Kelli says. “You can have it for like 10 strokes in an hour and a half practice and then fall back into old problems. But those 10 strokes will turn into 20 and then 30, so you keep at it.”

Neither of the Wegners grew up planning to row competitively. As youngsters, their preferred sport was soccer. It wasn’t until the summer before eighth grade, when Kerri participated in a rowing camp, that she became hooked. “I did it as a fun thing to do and loved it,” she recalls. “It was a very quick and crazy decision. I had played soccer my whole life.”

Kelli took up rowing after going with Kerri on a training trip to Florida during their freshman year of high school.

The sisters credit their ability to excel in the sport so quickly to their synergy. They competed in their first Head of the Charles as high school students, and it was then that they fell in love with Boston.

“We would look forward to the Head of the Charles every year like it was Christmas,” Kerri says. “We’d say, ‘We’re going to row on the Charles; we’re going to be rowing in the middle of Boston and all the buildings are going to be around us.’”

But now the race has a deeper, more personal resonance. “It’s cool to have the Head of the Charles be a home race,” says Kerri. “This is our water.”

The Wegners are quick to credit the team’s camaraderie to their Terrier teammates. “Our team has chemistry and it rubs off just as much as us being twins,” Kelli says. “We do have good chemistry, but it comes from other places, too, not just between us. It comes from our coaches and our team.”

Andre Khatchaturian can be reached at [email protected].

Explore Related Topics:

How To Add A Period For Double

How to Add a Period for Double-Tapping the Spacebar Use the Windows Settings or a third-party tool

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X

Double-tap to enter a period or full stop will help you type your sentences faster.

However, many do not know how they can do it on their Windows 11 PC.

This guide shows you three different ways to enter a period when you double-tap the space bar.

X

INSTALL BY CLICKING THE DOWNLOAD FILE

To fix Windows PC system issues, you will need a dedicated tool

Fortect is a tool that does not simply cleans up your PC, but has a repository with several millions of Windows System files stored in their initial version. When your PC encounters a problem, Fortect will fix it for you, by replacing bad files with fresh versions. To fix your current PC issue, here are the steps you need to take:

Download Fortect and install it on your PC.

Start the tool’s scanning process to look for corrupt files that are the source of your problem

Fortect has been downloaded by

0

readers this month.

There are some user reports that bring to light that they are not able to apply a period when they double-tap the space bar on their Windows 11 PCs. Some have even reported that for them the option to add a period when they double-tap the space bar isn’t visible on their Windows 11 PCs.

Well, if you are also experiencing the same issues, then either you are not looking at the correct place for the setting or you have recently discovered that you can add a period when you double-tap the space bar in Windows 11.

For both cases, we have mentioned some solutions in this guide that will help you get rid of the query in your head.

How do I add or stop the period after double spacing on Windows 11? 1. Use the Settings menu

Once you have enabled the above-mentioned option, you can now apply a period when you double-tap the space bar on your keyboard. This solution works for those who are facing the double tap space bar period not working on Windows 11 issue.

2. Use Registry Editor

In order to remove this feature of adding a period when you double-tap the space bar on Windows 11, you can simply change the DWORD value to 0.

3. Use a third-party tool

This is another way to run other different scripts and get the option that isn’t available under the Windows Settings menu.

AutoHotkey is a pretty small-sized app and runs like a charm. There isn’t a learning curve apart from the steps mentioned above to run scripts and in our case, double-tap the space bar in Windows 11 to enter period.

If you are expending an issue where the keyboard isn’t working on your laptop or PC, then we would suggest you check out our guide that mentions some of the best solutions to fix the problem.

For some users, the keyboard switches language on its own, which could be a frustrating issue. Such users should check out the guide on how to fix keyboard switches language on its own guide.

The mouse and keyboard are two of the most important input devices on a PC. In case, you are having issues with it or your PC isn’t detecting the connected devices, then you can check out our guide to resolve the problem.

Still experiencing issues?

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