What stream do files use?

When reading data 开发者_如何转开发through cin, the stdin stream is used. How about files? Do they use a particular stream object?

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There is a complete hierarchy of stream classes, you can see the doccumentation here.

Most notable amongst them are ifstream and ofstream for reading and writing to files respectively.

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They use what you choose :)

#include <fstream>
#include <iostream>


std::ifstream input("test.txt");

int i;
if (input >> i)
    std::cout << i << std::endl;


std::string s;
if (std::getline(input, s))
    std::cout << s << std::endl;

You could replace the name input by a name of your own chosing: it's just an identifier.

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You can use std::ifstream and std::ofstream for reading and writing files. You have to include fstream.