C语言程序填空：用辗转相除法求两个整数的最大公约数 帮帮

C语言程序填空：用辗转相除法求两个整数的最大公约数 帮帮 #includevoid main(){int a,b,r;int *p1,*p2;p1=&a;p2=&b;printf("input a,b:");scanf("%d,%d",p1,p2);if(*p1>*p2) ________________;while(____________){*p1=__________;*p2=________;r=___________;}printf("result is:%d\n",*p2);else printf("error!");}