C语言生成随机数和随机数组

C语言生成随机数和随机数组

---

time函数要包含头文件<time.h>
rand函数要包含头文件<stdlib.h>

随机数

int a;
srand((unsigned)time(NULL)); // 播种
a = rand() % 200 + 1;

---

随机数组

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

// 生成元素为1-200的随机数组
int main()
{
	int a[100],aa;
	int i;
	int count = 0;

	// 按时间重新播种
	srand((unsigned)time(NULL));

	for (i = 0; i < 100; i++)
	{
		aa = rand() % 200 + 1;
		a[i] = aa;
	}

	for (i = 0; i < 100; i++)
	{
		printf("%-5d", a[i]);
		count++;
		if (count == 10)
		{
			printf("\n");
			count = 0;
		}
			
	}

	system("pause");
	return 0;
}