Question

我正在尝试编写一个存储数组的简单程序，然后返回它。但是，它没有正确返回所有数字，特别是在数组的末尾。以下是输出的示例：

Please enter number of numbers
5
Please enter number 1
2
Please enter number 2
3
Please enter number 3
5
Please enter number 4
6
Please enter number 5
7
Number 1 is 2
Number 2 is 3
Number 3 is 5
Number 4 is 14
Number 5 is 1
logout

[Process completed]

and here is my code:

#include <stdio.h>

int main (void) {
    int i, num;
    int x[num];

    printf("Please enter number of numbers\n");
    scanf("%d",&num);

    for (i = 0; i < num; i++) {
        printf("Please enter number %d\n", i + 1);
        scanf("%d",&x[i]);
    }
    for (i = 0; i < num; i++) {
        printf("Number %d is %d\n", i + 1, x[i]);
    }

    return 0;
}

Answer 1

在扫描num之前，您正在执行int x[num]，而num存储垃圾值，您无法获得正确的输出。

int main (void) {
    int i, num;
   // int x[num]; // num is not defined here

    printf("Please enter number of numbers\n");
    scanf("%d",&num);
     int x[num];

    for (i = 0; i < num; i++) {
        printf("Please enter number %d\n", i + 1);
        scanf("%d",&x[i]);
    }
    for (i = 0; i < num; i++) {
        printf("Number %d is %d\n", i + 1, x[i]);
    }

    return 0;
}

Answer 2

我认为你应该初始化num变量，这样它最初就不会有垃圾值..

程序不能正确存储/返回数组

2 个答案: