c++从文档中读入数据和把输出数据写入文档

#include <iostream>#include <fstream>using namespace std;int main(){    int a[737][2];      ifstream fin("/home/wxq/桌面/datatest/intree.txt");      for(int i=0;i<737;i++)      {          for(int j=0;j<2;j++)          {              fin>>a[i][j];          }      }      ofstream fout("/home/wxq/桌面/datatest/intree1.txt");      for(int i=0;i<737;i++)      {          cout<<a[i][0]<<endl;          fout<<a[i][0]<<endl;      }}