C语言程序，编译没错误但是一运行系统就提示错误

#include"stdio.h" long k(long *); int main() { long m,n,h,*pm,*pn,*ph; long A; pm=&m; //指针要初始化，才能输入值 pn=&n; scanf("m=%d,n=%d",pm,pn); h=m-n; ph=&h; A=k(pm)/k(ph); printf("%d",A); } long k(lo