文件输入输出

#include <iostream>
using namespace std;
int main(){ 
	string a;
	freopen("C:/Users/Administrator/Desktop/in/in.txt","r",stdin);
	freopen("C:/Users/Administrator/Desktop/out/out.txt","w",stdout);
	cin>>a;
	cout<<a<<endl<<"\n";// \ 转义字符 
	fclose(stdin);
	fclose(stdout);
	return 0;
}