初学者 C - 以相反的顺序打印用户的浮点输入 [英] Beginner C - Print user's float inputs in reverse order

问题描述

我正在编写一个程序，它使用 1 条语句从用户那里读取 6 个浮点数.然后让它在 3 行中打印 6 个数字，并满足以下所有要求:

I'm writing a program that uses 1 statement to read 6 floating numbers from user. Then have it print the 6 numbers in 3 lines, with all of following requirements:

(1) 数字以与读入相反的顺序打印

(1) the numbers are printed in the reverse order that they are read in

(2) 它们分 3 行:第一行 1 个数字，下一行 2 个数字，最后一行 3 个数字

(2) they are on 3 lines: 1 number on the first line, 2 numbers on the next line, 3 numbers on the last line

(3) 将数字排列成列格式，右对齐，小数点后保留 1 位

(3) line up the numbers so they are in column format, right justified, with 1 digit after the decimal point

这是我对前两个要求的尝试

Here's my attempt for the first 2 requirements

#include <stdio.h>

int main(void)

{
    //variable definitions
    float f1,f2,f3,f4,f5,f6;

    printf ("Enter 6 float numbers, separated by commas: ");

    scanf ("%f1,%f2,%f3,%f4,%f5,%f6",&f1,&f2,&f3,&f4,&f5,&f6);

    printf ("%f6\n",f6);
    printf ("%f5,%f4\n",f5,f4);
    printf ("%f3,%f2,%f1\n",f3,f2,f1);

    return 0;

}

在我的初学者看来，这是完全合理的.

To my beginner mind, it makes perfect sense.

运行结果如下

输入 6 个浮点数，以逗号分隔:0.2,3.2,0.1,0.5,0.6,0.7

Enter 6 float numbers, separated by commas: 0.2,3.2,0.1,0.5,0.6,0.7

数字是:

-107374176.0000006

-107374176.0000006

-107374176.0000005,-107374176.0000004

-107374176.0000005,-107374176.0000004

-107374176.0000003,-107374176.0000002,0.2000001

-107374176.0000003,-107374176.0000002,0.2000001

按任意键继续...

除了最后一个，其他都是垃圾输出.感谢所有帮助！

All of them are garbage outputs except for the last one. Appreciate all the helps!

推荐答案

你的格式

scanf ("%f1,%f2,%f3,%f4,%f5,%f6",&f1,&f2,&f3,&f4,&f5,&f6);

期望在第一个 float 之后和下一个逗号之前有一个 1，在下一个等之后有一个 2.

expects a 1 after the first float and before the following comma, a 2 after the next etc.

应该是

scanf ("%f,%f,%f,%f,%f,%f",&f1,&f2,&f3,&f4,&f5,&f6);

由于未提供分隔数字，因此第二次转换(以及以下转换)失败，其他 float 仍未初始化.

Since the separating digits weren't provided, the second conversion (and the following) failed, and the other floats remained uninitialised.

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