Highest Common factors of two input numbers

Factor of number are integers when divided with the number lives no reminder or 0 as reminder.

Example :

1,3 & 5 are three factors of number 15.
1,2,3,4,6 are factors of number 12

Common factors are
We will ask user to enter two input numbers and then findout the highest common factors of both.
#include <stdio.h>
int main(void){
int i;
int num1,num2,highest_number,highest_common=0;
printf("Enter the first number ");
printf("Enter the second number ");


for ( i=1;i<highest_number;i++){
if(num1 % i ==0 && num2 % i==0){
 printf("Common factor = %d \n",i);
 highest_common=i; // common factor is passed
printf("Highest common factor %d",highest_common);
return 0;
Output is here
Enter the first number 12
Enter the second number 18
Common factor =1
Common factor=2
Common factor=3
Common factor=6

Highest common factor of two Numbers


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