用c++处理文件流

#include<bits/stdc++.h>
using namespace std;
struct Bian
{
    int num;
    string name;
}b[60];
int main()
{
    ifstream fp("bianhao.txt");
       if (! fp.is_open())
       { cout << "Error opening file"; exit (1); }
    for(int i=0;i<22;i++)
        fp>>b[i].num>>b[i].name;
    for(int i=0;i<22;i++)
        cout<<b[i].num<<"   "<<b[i].name<<endl;
    Bian a[15427];
    fp.close();
    fp.open("source.txt");
    if (! fp.is_open())
       { cout << "Error opening file"; exit (1); }
    for(int i=0;i<15427;i++)
    {
        fp>>a[i].name;
        for(int j=0;j<58;j++)
            if(a[i].name==b[j].name){a[i].num=b[j].num;break;}
    }
    cout<<a[15400].name<<"   "<<a[15400].num;
    fp.close();
    ofstream fp2;
    fp2.open("getinzu.txt");
    for(int i=0;i<15427;i++)
    {
        fp2<<a[i].num;
        //fp2<<"  ";
        //fp2<<a[i].name<<endl;
        fp2<<endl;

    }

}