Question

How to get the first digit of int number in Java

Answer 1

public class MyClass {
    static int first_digit(int n) { 
        int digits = (int)(Math.log10(n)); 
      
        n = (int)(n / (int)(Math.pow(10, digits))); 
      
        return n; 
    } 

    public static void main(String args[]) {
        int n = 8274;
     
        System.out.println(first_digit(n));

    }
}



/*
run:

8

*/

 

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Answer 2

public class MyClass {
    static int first_digit(int n) { 
         while (n >= 10)  
            n /= 10; 
      
        return n; 
    } 

    public static void main(String args[]) {
        int n = 5274;
     
        System.out.println(first_digit(n));

    }
}



/*
run:

5

*/

 

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Answer 3

public class MyClass {

    public static void main(String args[]) {
        int n = 7274;
     
        System.out.println(Integer.parseInt(Integer.toString(n).substring(0, 1)));

    }
}



/*
run:

7

*/

 

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