gcd of two numbers in c

1#include <stdio.h>
2int main()
3{
4    int n1, n2, i, gcd;
5
6    printf("Enter two integers: ");
7    scanf("%d %d", &n1, &n2);
8
9    for(i=1; i <= n1 && i <= n2; ++i)
10    {
11        // Checks if i is factor of both integers
12        if(n1%i==0 && n2%i==0)
13            gcd = i;
14    }
15
16    printf("G.C.D of %d and %d is %d", n1, n2, gcd);
17
18    return 0;
19}
20

1#include <stdio.h>
2int main()
3{
4    int n1, n2;
5    
6    printf("Enter two positive integers: ");
7    scanf("%d %d",&n1,&n2);
8
9    while(n1!=n2)
10    {
11        if(n1 > n2)
12            n1 -= n2;
13        else
14            n2 -= n1;
15    }
16    printf("GCD = %d",n1);
17
18    return 0;
19}