存档问题求助(freopen)

#include<bits/stdc++.h>
#define ll long long
using namespace std;
string name;
void cd_put(void)//存档 
{
	freopen("存档.txt","w",stdout);
	cout<<name;
	fclose(stdout); 
}
void dd_put(void)//读档 
{
	freopen("存档.txt","r",stdin);
	cin>>name;
	fclose(stdin);
}
int main()
{
	ll ch,a,b;
	cout<<"1 存档 2 读档"<<endl;
	cin>>ch;
	if (ch==1) cin>>name,cd_put();//将name存入存档 
    else dd_put(),cout<<name;//读入name 
    cin>>a>>b;//a+b 
    cout<<a+b;
}