format number in String?

[patrick]

Hello

I have a variable of string type.
String str1 = "312.455"
String str2 = "5"
String str3 = "2.1"
this is a number, declared as a character.

str1 = "312.45"
str2 = "5.00"
srr3 = "2.10"

I want to set the number of decimal places to the second digit from the back

Do you have example code?

 

[patrick]

Hello

I have a variable of string type.
String str1 = "312.455"
String str2 = "5"
String str3 = "2.1"
this is a number, declared as a character.

str1 = "312.45"
str2 = "5.00"
srr3 = "2.10"

I want to set the number of decimal places to the second digit from the back

Do you have example code?

I want to a number Format like this.
However, it is declared as a string format

31,456.234 <===== i wannt to this format.
NumbeeFormat : #,###.00# <== it is correct?

 

[jmcilhinney]

You can't format a string as though it were a number. If you want to use numeric formatting then you have to have a number to format. If the data represents numbers then it should be numbers in the first place, if at all possible. text can be used for serialisation and display but, otherwise, numbers should be numbers. Assuming you can't change that, you will need to convert the string you have to a double or decimal and then convert it back to a string using the appropriate numeric format specifier. Otherwise, you'd just have to perform string manipulation, which would be messy.

If you want to know how many decimal places there are in the original data, you can use string.IndexOf and string.Length with a bit of simple arithmetic.

 

[Skydiver]

Unfortunately, you'll need to first parse the string into a double or a decimal. Then once you have a numeric value, you can use ToString() with either a standard or custom format string. I suggest using a standard format string like "F2".

 

[Skydiver]

Standard numeric format strings

In this article, learn to use standard numeric format strings to format common numeric types into text representations in .NET.

learn.microsoft.com

 

[cjard]

I suggest using a standard format string like "F2".

Note that that won't insert the thousands groupings implied as required by the final paragraph of the question

31,456.234 <===== i wannt to this format.
NumbeeFormat : #,###.00# <== it is correct?

You probably want #,##0.00 , if you want 0.10 etc

 

[jmcilhinney]

Note that that won't insert the thousands groupings implied as required by the final paragraph of the question



You probably want #,##0.00 , if you want 0.10 etc

var n = 123456.789;

Console.WriteLine(n.ToString("N2"));
Console.WriteLine(n.ToString("F2"));
Console.WriteLine(n.ToString("#,##0.00"));
Console.WriteLine(n.ToString("#,0.00"));

Output:

123,456.79
123456.79
123,456.79
123,456.79

 

[cjard]

Thanks John, couldn't remember how many hashes were needed

 

[gulshan212]

Hello this is Gulshan Negi
Well, I searched about it and I found that you can try below code to get what you are looking for.

using System;

public class DecimalPlacesExample
{
    public static void Main(string[] args)
    {
        string str1 = "312.455";
        string str2 = "5";
        string str3 = "2.1";

        // Convert strings to decimal for precise decimal manipulation
        decimal decimal1 = decimal.Parse(str1);
        decimal decimal2 = decimal.Parse(str2);
        decimal decimal3 = decimal.Parse(str3);

        // Set the number of decimal places to the second digit from the back
        decimal rounded1 = Math.Round(decimal1, 2);
        decimal rounded2 = Math.Round(decimal2, 2);
        decimal rounded3 = Math.Round(decimal3, 2);

        // Convert the rounded decimal values back to strings
        string result1 = rounded1.ToString();
        string result2 = rounded2.ToString();
        string result3 = rounded3.ToString();

        // Print the results
        Console.WriteLine("str1 = " + result1);
        Console.WriteLine("str2 = " + result2);
        Console.WriteLine("str3 = " + result3);
    }
}

Thanks