因数分解

#include<stdio.h>#include<math.h>int factor(int n){int i;for(i=2;i<n/2;i++){if(n%i==0){n=n/i;printf("%d*",i);i--;}}printf("*");return n;} int main(){int i;i=90;printf("%d=",i);int ret=factor(i);printf("%d",ret);return 0;}