Scanf("%c %f %d %c") 返回奇怪的值 [英] Scanf("%c %f %d %c") Returning weird values

问题描述

我的课堂作业要求我提示用户在一个输入行中输入四个变量，char float int char.

My class assignment asks me to prompt the user to input four variable, char float int char, in one input line.

完整代码如下:

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <math.h>

int main(void){
    char h = 'a';
    char b, c, d, e;
    int m, n, o;
    float y, z, x;
    short shrt = SHRT_MAX;
    double inf = HUGE_VAL;

    printf("Program: Data Exercises\n");

    printf("%c\n", h);
    printf("%d\n", h);

    printf("%d\n", shrt);

    printf("%f\n", inf);

    printf("Enter char int char float: ");
    scanf("%c %d %c %f", &b, &m, &c, &y);
    printf("You entered: '%c' %d '%c' %.3f \n", b, m, c, y);

这部分代码是我遇到问题的地方.

This section of code is where I am having the issue.

    printf("Enter char float int char: ");
    scanf("%c %f %d %c", &d, &z, &n, &e);
    printf("You entered: '%c' %f %d '%c' \n", d, z, n, e);

如果我隔离上述部分，这部分工作.

This part works if I isolate the above section.

    printf("Enter an integer value: ");
    scanf("%d", &o);
    printf("You entered: %15.15d \n", o);

    printf("Enter a float value: ");
    scanf("%f", &x);
    printf("You entered: %15.2f \n", x);

    return 0;
}

由于代表不够高而无法发布图片，我将在运行程序时提供指向控制台屏幕截图的链接.

Seeing as I cannot post images due to not having a high enough rep, I will provide a link to a screen-cap of the console when running the program.

如果有人能向我解释为什么程序无法正常工作，我将不胜感激.提前致谢.

I would really appreciate if someone could explain to me why the program is not working correctly. Thanks in advance.

推荐答案

你在这一行有一个错误:

You have an error in this line:

scanf("%c %d %c %f", &b, &m, &c, &y);

%c前需要加一个空格.
试试这一行

You need to add one space before %c.
Try this line

scanf(" %c %d %c %f", &b, &m, &c, &y);  // add one space %c
scanf(" %c %f %d %c", &d, &z, &n, &e);

这是因为输入数字并按回车后，新行会留在缓冲区中，并会被下一个scanf处理.

This is because after you input the number and press ENTER, the new line stays in the buffer and will be processed by the next scanf.

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