Question

C++ 文件结束判断

ifstream infile("a.txt",ios::in);
if(!infile){
cout<<"open error!"<<endl;
exit(1);
}
char ch;

infile.get(ch);
while(ch!=EOF){
infile.get(ch);
cout<<ch;
}
cout<<endl<<endl;
infile.close();
这样为什么是死循环，怎样利用ch判断文件结束？

Answer 1

ifstream infile("a.txt",ios::in);
char ch;
if(infile.fail()){
cout<<"open error!"<<endl;
exit(0);
}

do
{
infile.get(ch);
cout<<ch;
}while(!infile.eof());
cout<<endl<<endl;
infile.close();

这样使用比较正规，可以试下哈~~祝你好运~~

Answer 2

infile.get(ch);
while(ch!=EOF){
infile.get(ch);
cout<<ch;
}

改为

while(infile>>ch){
cout<<ch;
}

Answer 3

#include <iostream>
#include <iomanip>
#include <fstream>
using namespace std;

int main()
{
ifstream infile("c:\\a.txt",ios::in);
if(!infile){
cout<<"open error!"<<endl;
exit(1);
}
char ch;

while(infile.get(ch)){
//infile.get(ch);
cout<<ch;
}
cout<<endl<<endl;
infile.close();

}

Answer 4

ch!=EOF这个不好用，只有用infile!=EOF