C primer plus 第七章 练习5： 用swich重做练习3

#include <stdio.h>
#include <ctype.h>
int main(void)
{
    int c;
    int n_ou=0, n_ji=0, n_oushu=0, n_jishu=0;
    float n_oup=0, n_jip=0;

    printf("请输入一些整数: ");
    while((scanf("%d", &c)) == 1)
    { 
        if(c == 0)
            break;
        switch(c % 2)
        {
        case 0:
            n_ou++;
            n_oushu += c;
            n_oup = (n_oushu / n_ou);
            break;
        case 1:
            n_ji++;
            n_jishu += c;
            n_jip = (n_jishu / n_ji);
            break;
        }
    }
    printf("有%d个偶数，偶数平均值为%.2f.\n", n_ou, n_oup);
    printf("有%d个奇数，奇数平均值为%.2f.\n", n_ji, n_jip);
    return 0;
}