Question

How to add leading zeros to number in C#

Answer 1

using System;

class Program
{
    static void Main() {
        int num = 7;

        Console.Write(num.ToString().PadLeft(3, '0'));
    }
}



/*
run:

007

*/

 

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Answer 2

using System;

class Program
{
    static void Main() {
        int num = 7;

        Console.Write(num.ToString("D3"));
    }
}



/*
run:

007

*/

 

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Answer 3

using System;

class Program
{
    static void Main() {
        int num = -4;

        Console.Write(num.ToString("D3"));
    }
}



/*
run:

-004

*/

 

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