find GCD of two numbers

/*P5.8 Program to find GCD of two numbers*/

#include<stdio.h>
int GCD(int a, int b);
int gcd(int a, int b);

main()
{

    int a, b;
    printf("Enter a and b : \n");
    scanf("%d%d",&a, &b);
    printf("%d\n",GCD(a,b));
    printf("%d\n",gcd(a,b));
}/*End of main()*/

/*Recursive*/
int GCD(int a, int b)  
{
    if(b==0)
        return a;
    return GCD(b, a%b);
}/*End of GCD()*/

/*Iterative*/
int gcd(int a, int b)
{
    int rem;
    while(b != 0)
    {
        rem = a%b;
        a = b;
        b = rem;
    }
    return a;
}/*End of gcd()*/