greatest common divisor using User defined function

#include
#include

int gcd(int no1,int no2)
{
    int greater,smaller,c;
    if(no1>no2)
    {
               greater=no1;
               smaller=no2;
               }
               else
               {
                          greater=no2;
                          smaller=no1;
                          }
                          while(smaller!=0)
                          {
                          c=greater%smaller;
                          greater=smaller;
                          smaller=c;
                          } 
    return greater;
}
int main()
{
    int a,b,c;
    printf("please enter two positive integers \n");
    scanf("%i %i",&a,&b);
    c=gcd(a,b);
    printf("GCD of %d and  %d is :%d \n",a,b,c);
    getch();
    return 0;
}