c语言编程问题

#include "stdio.h" void main( ) { long int m,m1,n,a,b; scanf("%ld",&m); m1=m; n=m*m1; while(m1) { a=m1%10; b=n%10; if(a!=b) break; m1=m1/10; n=n/10; } if(m1!=0) printf("%d不是一个同构数",m); else