c - 在 C 中使用#include

Question

我不知道为什么会这样。有没有人遇到过这个？我使用的是 Netbeans 8.2，程序在 Debug模式下运行。

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define N 100

int main() {
    //all lockers are closed
    bool lockers[N + 1] = {false};

    return 0;
} 

如您所见，Netbeans 表示某些索引保存的似乎是 int 值，而当我将所有值声明为 false 时，突出显示的那个甚至是 true。

Answer 1

boolean 值是一种算术类型，因此，当您没有在初始化程序中提供明确的值时，它们应该像静态一样被初始化。

这在(例如)C11 6.7.9 Initialization 中有详细说明(释义):

21/ If there are fewer initializers in a brace-enclosed list than there are elements or members of an aggregate, the remainder of the aggregate shall be initialized implicitly the same as objects that have static storage duration.

10/ If an object that has static or thread storage duration is not initialized explicitly and if it has arithmetic type, it is initialized to (positive or unsigned) zero.

就正确检查而言，对您的代码进行如下临时更改:

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#define N 100

int main() {
    //all lockers are closed
    bool lockers[N + 1]= {false};

    for (int i = 0; i <= N; ++i)
        if (lockers[i])
            printf("%d is the wrong value\n", i);

    return 0;
}

您根本不应该得到任何输出，如果是这种情况，要么是 NetBeans 调试器错误，要么是您使用错误:-)