文件重定向函数freopen

#include<iostream>
#include<stdio.h>
using namespace std;
int main()
{
    const char * in ="E:\\in.txt";
    const char * out="E:\\out.txt";
    if(freopen(in,"r",stdin)==NULL)
    {
        cout<<"in.txt 打开失败"<<endl;
        return 0;
    }
    if(freopen(out,"w",stdout)==NULL)
    {
        cout<<"out.txt 打开失败"<<endl;
        return 0;
    }
    int n;
    cin>>n;
    cin.get();
    cout<<n;
    char str[50];
    while(n)
    {
        cin.getline(str,8);
        cout<<str<<endl;
        n--;
    }
    return 0;
}