Greatest common divisor of two non-negative numbers

#include<stdio.h>

//main function

main ()

{

     int u, v;

     printf("\nEnter the two numbers to find GCD.\n");

     scanf("%d%d",&u,&v);

     gcd(u,v);

     getch();

}

//calling function

gcd(u,v)    //gcd(u,v) being called by main function

{

int temp;

printf("The gcd of %d and %d is ",u,v);

while(v!=0)

    {

    temp=u%v;

    u=v;

    v=temp;

    }

printf("%d\n",u);

}