Write a C program to find HCF (GCD) of two numbers

Find HCF (GCD) of two numbers

Sample Output

Find HCF (GCD) of two numbers.

Enter first number: 153
Enter second number: 81

GCD: 9

Source Code

#include<stdio.h>
 
int main()
{
    int dividend, divisor, remainder = 1;
 
    printf("Find HCF (GCD) of two numbers.\n\nEnter first number: ");
    scanf("%d", &dividend);
 
    printf("Enter second number: ");
    scanf("%d", &divisor);
 
    while(remainder != 0)
    {
        remainder = dividend % divisor;
        dividend = divisor;
        divisor = remainder;
    }
    printf("\nGCD: %d\n", dividend);
 
    return 0;
}

Sample Output

Find HCF (GCD) of two numbers.

Enter first number: 30
Enter second number: 12

GCD: 6