How to use flag in c language

In C language, flag is a Boolean value used to indicate whether a certain condition is true. To declare a flag, you can use the following syntax: int flag = 0; (0 means false); to set the flag to true, use flag = 1; (1 means true); to get the current value of the flag, use if (flag) {} (executed when flag is true).

Using flag in C

What is flag?

flag is a Boolean value that indicates whether a condition is true.

Using flag in C language

In C language, you can use the following syntax to declare a flag:

<code class="c">int flag = 0; // 初始化为假，0 表示假</code>

To set the flag to true, You can use the assignment operator:

<code class="c">flag = 1; // 1 表示真</code>

To get the current value of flag, you can use a Boolean expression:

<code class="c">if (flag) {
    // 当 flag 为真时执行此代码块
} else {
    // 当 flag 为假时执行此代码块
}</code>

Example

The following example shows How to use flag in C language:

<code class="c">#include <stdio.h>

int main() {
    int is_true = 0; // 初始化为假

    // 设置 is_true 为真
    is_true = 1;

    // 检查 is_true 是否为真
    if (is_true) {
        printf("is_true is true\n");
    } else {
        printf("is_true is false\n");
    }

    return 0;
}</code>

Output:

<code>is_true is true</code>

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