Find GCD or HCF of Two Numbers in Java

An H.C.F or Highest Common Factor, is the largest common factor of two or more values.

For example factors of 12 and 16 are −

12 → 1, 2, 3, 4, 6, 12
16 → 1, 2, 4, 8, 16

The common factors are 1, 2, 4 and the highest common factor is 4.

Algorithm

• Define two variables - A, B

• Set loop from 1 to max of A, B

• Check if both are completely divided by same loop number, if yes, store it

• Display the stored number is HCF

Example: Using Java for loop

import java.util.Scanner;
public class GCDOfTwoNumbers {
   public static void main(String args[]){
      int a, b, i, hcf = 0;
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter first number :: ");
      a = sc.nextInt();
      System.out.println("Enter second number :: ");
      b = sc.nextInt();

      for(i = 1; i <= a || i <= b; i++) {
         if( a%i == 0 && b%i == 0 )
         hcf = i;
      }
      System.out.println("HCF of given two numbers is ::"+hcf);
   }
}

Output

Enter first number ::
625
Enter second number ::
125
HCF of given two numbers is ::125