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C stdlib rand() 函数

❮ C stdlib 库


示例

显示 1 到 100 之间 10 个随机数

// Initialize the randomizer using the current timestamp as a seed
// (The time() function is provided by the <time.h> header file)
srand(time(NULL));

// Generate random numbers
for (int i = 0; i < 10; i++) {
  int num = rand() % 100 + 1;
  printf("%d ", num);
}
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定义和用法

The rand() 函数返回一个随机的非负整数。

此函数生成的数字是伪随机数,这意味着如果拥有足够的信息,就可以预测它们。为了使数字看起来更随机,应使用 srand() 函数为它们设置种子,并且每次程序运行时使用不同的值。

The rand() 函数在 <stdlib.h> 头文件中定义。


语法

rand()

技术细节

返回值 一个 int 值,表示一个随机整数。

❮ C stdlib 库

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