1,2,3,4,6 are factors of number 12

Common factors are

`1,3`

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 ");
scanf("%d",&num1);
printf("Enter the second number ");
scanf("%d",&num2);
if(num1>num2){
highest_number=num1;
}else{highest_number=num2;}
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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