3.13.cpp

c程序设计技巧, c入门和简单算法设计。

#include<stdio.h>
int main()
{
    long n;
    int k;
    printf("Please enter a number:");
    scanf("%d",&n);
    k=(n%3==0)+(n%5==0)*2+(n%7==0)*4;
    switch(k)
    {
             case 7:
                  printf("All\n");break;
             case 6:
                  printf("5 and 7\n");break;
             case 5:
                  printf("3 and 7\n");break;
             case 4:
                  printf("7\n");break;
             case 3:
                  printf("3 and 5\n");break;
             case 2:
                  printf("5\n");break;
             case 1:
                  printf("3\n");break;
             case 0:
                  printf("none\n");break;
                  }
                  scanf("%d",&n);
                  return 0;
}