Format number in C#

Format number in C#

In C#, you can format numbers using various format specifiers and methods provided by the ToString method or the string.Format method. The most common numeric format specifiers are:

  1. Standard Numeric Format Specifiers:

    • "C": Currency format
    • "D": Decimal format
    • "E": Scientific (exponential) format
    • "F": Fixed-point format
    • "G": General format
    • "N": Number format with thousands separators
    • "P": Percentage format
    • "X": Hexadecimal format

  2. Custom Numeric Format Specifiers: You can also create custom numeric format strings to format numbers according to your specific requirements.

Here are some examples of how to format numbers in C#:

using System;

class Program
{
    static void Main()
    {
        double number = 12345.6789;

        // Standard Numeric Format Specifiers
        Console.WriteLine(number.ToString("C")); // $12,345.68
        Console.WriteLine(number.ToString("D")); // 12346
        Console.WriteLine(number.ToString("E")); // 1.234568E+004
        Console.WriteLine(number.ToString("F")); // 12345.68
        Console.WriteLine(number.ToString("G")); // 12345.6789
        Console.WriteLine(number.ToString("N")); // 12,345.68
        Console.WriteLine(number.ToString("P")); // 1,234,568.00%
        Console.WriteLine(((int)number).ToString("X")); // 3039

        // Custom Numeric Format Specifiers
        Console.WriteLine(number.ToString("0.00")); // 12345.68
        Console.WriteLine(number.ToString("#,##0.00")); // 12,345.68
        Console.WriteLine(number.ToString("0.00E+00")); // 1.23E+04
    }
}

In this example, the ToString method is used to format the number as a string using various standard and custom numeric format specifiers. Each format specifier represents a different format for the number. You can experiment with different format strings to achieve the desired output.

Keep in mind that the formatting depends on the current culture of the application. If you need consistent formatting, consider specifying a specific culture using the overload of the ToString method that accepts a CultureInfo parameter. For example:

using System;
using System.Globalization;

class Program
{
    static void Main()
    {
        double number = 12345.6789;

        // Specify a specific culture for formatting
        CultureInfo culture = new CultureInfo("en-US");

        Console.WriteLine(number.ToString("C", culture)); // $12,345.68
        Console.WriteLine(number.ToString("N", culture)); // 12,345.68
    }
}

This ensures that the number is formatted using the specified culture's formatting rules, regardless of the current system culture.

Examples

  1. "C# format integer with commas"

    int intValue = 1234567;
string formattedValue = intValue.ToString("N0");

    Description: This code snippet formats an integer (intValue) with commas using the "N0" format specifier to represent a whole number.

  2. "C# format double as currency"

    double doubleValue = 987.65;
string formattedValue = doubleValue.ToString("C");

    Description: This code snippet formats a double value (doubleValue) as currency using the "C" format specifier.

  3. "C# format decimal with specific number of decimal places"

    decimal decimalValue = 543.210987m;
string formattedValue = decimalValue.ToString("0.00");

    Description: This code snippet formats a decimal value (decimalValue) with two decimal places using the "0.00" format specifier.

  4. "C# format number with percentage symbol"

    double percentageValue = 0.75;
string formattedValue = percentageValue.ToString("P");

    Description: This code snippet formats a double value (percentageValue) as a percentage using the "P" format specifier.

  5. "C# format number with scientific notation"

    double scientificValue = 1234567.89;
string formattedValue = scientificValue.ToString("E");

    Description: This code snippet formats a double value (scientificValue) using scientific notation with the "E" format specifier.

  6. "C# format number with custom thousands separator"

    int intValue = 9876543;
CultureInfo customCulture = new CultureInfo("en-US");
customCulture.NumberFormat.NumberGroupSeparator = "'";
string formattedValue = intValue.ToString("N0", customCulture);

    Description: This code snippet formats an integer (intValue) with a custom thousands separator (single quote) using the "N0" format specifier and a custom culture.

  7. "C# format number as hexadecimal"

    int hexValue = 255;
string formattedValue = hexValue.ToString("X");

    Description: This code snippet formats an integer (hexValue) as a hexadecimal string using the "X" format specifier.

  8. "C# format number with fixed width"

    int fixedWidthValue = 42;
string formattedValue = fixedWidthValue.ToString("D4");

    Description: This code snippet formats an integer (fixedWidthValue) with a fixed width of four characters using the "D4" format specifier.

  9. "C# format number with leading zeros"

    int leadingZerosValue = 7;
string formattedValue = leadingZerosValue.ToString("000");

    Description: This code snippet formats an integer (leadingZerosValue) with leading zeros and a fixed width of three characters using the "000" format specifier.

  10. "C# format number as a custom string"

    double customFormatValue = 123.456;
string formattedValue = $"{customFormatValue:###,###.00}";

    Description: This code snippet formats a double value (customFormatValue) with a custom format using string interpolation and a custom format string.

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