【C Primer Plus】编程练习第七章

#include <stdio.h>
#include <string>

int main()
{
    char ch;
    int space_1 = 0;
    int break_1 = 0;
    int other_1 = 0;
    printf("请输入字符：");
    while ((ch=getchar()) != ‘#‘)
    {
        if (ch == ‘ ‘)
            space_1++;
        else if (ch == ‘\n‘)
            break_1++;
        else
            other_1++;
        
    }
    printf("空格有%d个，换行符有%d个，其他字符有%d个", space_1, break_1, other_1);

    getchar();
    getchar();
    return 0;
}

#include <stdio.h>
#include <string>

int main()
{
    char ch = 0;
    int i = 0;

    printf("请输入字符:");
    while ((ch = getchar()) != ‘#‘)
    {
        if ((i % 8 == 0) && (i != 0))
        {
            putchar(‘\n‘);
        }
        i++;
        if (ch != ‘\n‘)
            printf("%c:%d ", ch, ch);
    }
    getchar();
    getchar();
    return 0;
}

#include <stdio.h>
#include <string>

int main()
{
    int in = 0;
    int odd = 0;
    int even = 0;
    int sum_e = 0;
    int sum_o = 0;
    double odd_mean = 0;
    double even_mean = 0;
    printf("请输入整数:");
    while ((in = getchar()) != ‘0‘)
    {
        if ((in % 2 == 0)) {
            
            even++;
            sum_e = in + sum_e;
            even_mean = sum_e / even;
        }
        else {
            odd++;
            sum_o = in + sum_o;
            odd_mean = sum_o / even;
        }
    }
    printf("输入的偶数个数有%d,偶数平均值为%lf,输入的奇数个数有%d,奇数平均值为%lf", even, even_mean, odd, odd_mean);
    getchar();
    getchar();
    return 0;
}