Random string generation function

Author:火影

Wrote for play, Don't laugh at me!

#include "stdafx.h"
#include <stdio.h>
#include "windows.h"
#pragma comment(lib,"winmm.lib")

int main(int argc, char* argv[])
{
  int RanNum;
  int n1,n2;
  int count;
  char *buffer;
  char ch;
  //Generation seed
  srand((unsigned(timeGetTime())));
  RanNum=rand();
  n1=RanNum%10;
  printf("Random number%d\n",n1);
  n1++;
  buffer=(char *)VirtualAlloc(NULL,2*n1,MEM_COMMIT,PAGE_EXECUTE_READWRITE);
  memset((void *)buffer,0,2*n1);
  for (count=0;count<(2*n1-1);count++)
  {
    RanNum=rand();
    n2=RanNum%52;
    printf("Random number%d\n",n2);
    if (n2>=26)
    {
      ch=n2&0x0F;
      ch+=0x47;  //'a'------'z'
    }
    else
    {
      ch=n2&0x0F;
      ch+=0x41;  //'A'-----'Z'
    }
    buffer[count]=ch;
   
  }
  printf("Generate random string%s\n",buffer);
  VirtualFree(buffer,2*n1,MEM_DECOMMIT);
  return 0;
}