枚举算法1

#include <stdio.h>int main(){int c1,c2,c3,n;printf("请输入一个整数：");scanf("%d",&n);printf("\n");c1=n%3==0;c2=n%5==0;c3=n%7==0;switch((c1<<2)+(c2<<1)+c3){case 0:printf("能被3，5，7整除\n");break;case 1:printf("仅被7整除\n");break;case 2:printf("仅被5整除\n");break;case 3:printf("仅被5，7整除\n");break;case 4:printf("仅被3整除\n");break;case 5:printf("仅被3，7整除\n");break;case 6:printf("仅被3，5整除\n");break;case 7:printf("能同时被3，5，7整除\n");break;}return 0;}