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C stdlib srand() 函数

❮ C stdlib 库


例子

显示 1 到 100 之间的 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);
}
自己试一下 »

定义和用法

The srand() 函数用种子初始化 rand() 函数。 种子指定 rand() 函数将遵循的数字序列。 这意味着相同的种子将始终导致相同的随机数序列。

The srand() 函数在 <stdlib.h> 头文件中定义。


语法

srand(unsigned int seed);

参数值

参数 描述
种子 指定 rand() 函数将遵循的数字序列的数字。

更多例子

例子

两次显示相同的随机数序列

// Initialize the randomizer with a fixed value
srand(10000);

// Generate 5 random numbers
for (int i = 0; i < 5; i++) {
  int num = rand() % 100 + 1;
  printf("%d ", num);
}
printf("\n");

// Initialize the randomizer with the same value
srand(10000);

// Generate 5 random numbers
for (int i = 0; i < 5; i++) {
  int num = rand() % 100 + 1;
  printf("%d ", num);
}
自己试一下 »

❮ C stdlib 库

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