ifstream的用法#include<fstream.h>#include<iostream.h>//usingnamespacestd;staticcharch;main(){ifstreaminfile(filename,ios::in);if(!infile){cout<<"openerror!"<<endl;exit(1);}infile.get(ch);cout.put(ch);cout<&

Question

ifstream的用法#include<fstream.h> #include<iostream.h> //usingnamespacestd; staticcharch; main() { ifstreaminfile(filename,ios::in); if(!infile) { cout<<"openerror!"<<endl; exit(1); } infile.get(ch); cout.put(ch); cout<<endl; system("pause"); } 为何我这样写的时候程序说ifstream没有定义呢？

Answer 1

#include #include #include usingnamespacestd; staticcharch; main() { ifstreaminfile(filename,ios::in); if(!infile) { cout