Hàm tìm UCLN cua hai so nguyen !!!!

#include<stdio.h>
#include<conio.h>
int ucln(int a, int b)
{
while (a!=b)
{
if (a>b) a=a-b;
else b=b-a;
}
return b;
}

void main ()
{
int x,y,uc;
printf("Nhap hai co can tin uoc chung cua tui no: ");
scanf("%d%d",&x,&y);
printf("Uoc chung cua tui no ne:%d",ucln(x,y));
printf("\nNhan ENTER de ket thuc");
getch();
}