随机字符串的生成方法

C/C++ code

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

char * rand_str(int in_len) 
{ 
  char *__r = (char *)malloc(in_len + 1); 

  int i; 

  if (__r == 0) 
  { 
    return 0; 
  } 

  srand(time(NULL) + rand());    //初始化随机数的种子
  for (i = 0; i  < in_len; i++) 
  { 
    __r[i] = rand()%94+32;      //控制得到的随机数为可显示字符
  } 

  __r[i] = 0; 

  return __r; 
} 

void main() 
{ 
    int i=0;
    while(i++<10)
    {
        char *p = rand_str(15);
        printf("group %02d: %s\n", i, p);
        free(p);
    }
}

vc6编译通过，输出：
group 01: *P *w^57wa&b#82
group 02: Rb5Q1CvGwL{pylS
group 03: bI:ZL1!sMYS,ma]
group 04: ;va0/ Z|*{B]=o%
group 05: yGm;h=F`nq"[Vpq
group 06: P0wWS\Q?}/y{{i:
group 07: #-`1:bJJ]/`$IdA
group 08: AoHuc=>`a_Y%kn/
group 09: >) group 10: U%iol;?]^T_\;(u