#include <iostream>
#include <time.h>
#include <assert.h>

using namespace std;

const int size=10000000;
int num[size];

int main()
{
  FILE *fp=fopen("data.txt","w");
  assert(fp);

  for(int n=1; n <= size; n  )
  {
     num[n]=n;
  }

  srand((unsigned)time(NULL));

  for (int n=0; n < size;n  )
  {
      int i=(rand()*RAND_MAX   rand())000000;
      int j=(rand()*RAND_MAX   rand())000000;
      swap(num[i],num[j]);
  }

  for (int n=0; n < size; n  )
  {
      fprintf(fp,"%d ",num[n]);
  }

  fclose(fp);

  return 0;
}

本文由美洲杯赔率发布于计算机教程,转载请注明出处：C 随机生成整数测试磁盘文件排序