生成固定范围内的随机数

关键字： 随机数    范围#include "stdio.h"
#include "math.h"
#include "windows.h"
#include "time.h"
#define N 10
int x
;

void main()
{

 DWORD dwSeed ;
 for (DWORD i=0;i<N;i++)
 {
     x[i]=i;                    }

 if (dwSeed == 0) dwSeed = time(NULL);
 srand(dwSeed);

 for (i=N-1; i > 1; i--)
 {
  DWORD index = (DWORD)floor((i+1)*(float)rand()/RAND_MAX);

  printf("%d   %f/n", index, (float)rand()/RAND_MAX);

  DWORD tmp = x[i];
  x[i] = x[index];
  x[index] = tmp;
 }

 FILE *fw;
 fw = fopen("rand.dat","w");
 for( i=0;i<N;i++)
  fprintf(fw,"%d  ", x[i]);
 fclose(fw);
// return;

}