求2个数的最大公约数

#include <stdio.h>int HCF(int x,int y){int tem;if(x==0||y==0)return 0;if(x<y){tem=x;x=y;y=tem;}if(x%y==0)return y;else{return HCF(y,x%y);}} int main (){printf("%d\n",HCF(11,7));return 0;}