Question

How to get the first digit of int number in C#

Answer 1

using System;

class Program
{
    static void Main() {
        int i = 97253;
        string s = i.ToString();
        
        Console.WriteLine(s[0]);
    }
}



/*
run:

9

*/

 

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Answer 2

using System;

class Program
{
    static void Main() {
        int i = 97253;
        string s = i.ToString();
        int num = (int)s[0] - 48;
        
        Console.WriteLine(num);
    }
}



/*
run:

9

*/

 

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Answer 3

using System;

class Program
{
    static void Main() {
        int i = 87253;
        string s = i.ToString();
        int num = s[0] - '0';
        
        Console.WriteLine(num);
    }
}



/*
run:

8

*/

 

70+ SQL courses for beginners and professionals

Answer 4

using System;

class Program
{
    static void Main() {
        int i = 87253;
        int first_digit = i;
 
        while(first_digit >= 10) {
            first_digit = first_digit / 10;
        }

        Console.WriteLine(first_digit);
    }
}



/*
run:

8

*/

 

70+ SQL courses for beginners and professionals