#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)); //用時間做種,每次產生隨機數不一樣
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);
}
運行結果:
./test
line=PSJJZ
每次運行結果不一樣,也可以改成隨機數
比如說產生4位隨機數,代碼如下:
#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);
}
運行結果每次不一樣