C语言——产生一个随机字符或者随机数

来源：互联网发布：征途2怎么延时网络编辑：程序博客网时间：2024/05/16 12:53

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

void genRandomString(char* buff, int length)
{
char metachar[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
int i = 0;
srand((unsigned) time(NULL)); //用时间做种，每次产生随机数不一样
for (i = 0; i < length; i++)
{
buff[i] = metachar[rand() % 62];
}

buff[length] = '\0';

}

void main()
{
char line[64] = {0};
genRandomString(line, 5);
printf("line=%s\n", line);

}

运行结果：

./test
line=PSJJZ

每次运行结果不一样，也可以改成随机数

比如说产生4位随机数，代码如下：

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

void genRandomString(char* buff, int length)
{
char metachar[] = "0123456789";
int i = 0;
srand((unsigned) time(NULL));
for (i = 0; i < length; i++)
{
buff[i] = metachar[rand() % 10];
}

buff[length] = '\0';

}

void main()
{
char line[64] = {0};
genRandomString(line, 4);
printf("line=%s\n", line);
}

运行结果每次不一样

阅读全文

0 0