GCD-Euclid's Algorithm

#include<stdio.h>
#include<process.h>
void gcd(int,int);

void main()
{
    int a,b;
    printf("\nEnter the nos ");
    scanf("%d%d",&a,&b);
    gcd(a,b);
}

void gcd(int a,int b)
{
    if(a==0)
    {
        printf("\nGCD is %d",b);
        exit(0);
    }
    a>=b?gcd(a%b,b):gcd(b%a,a);
}