What is the usage of iostream in C++?

6 months ago

2 minutes

The iostream header file in the C++ standard library is used for input and output, containing classes and functions for input and output operations, allowing for console input and output.

Some commonly used iostream classes are:

istream is a class used for input operations, such as cin.
`ostream: a class used for output operations, such as cout`
iostream: a class that contains both istream and ostream at the same time.

The basic steps for using iostream are as follows:

Can you lend me a hand with this project?
Input operation can be performed using the cin object, while the output operation can be done using the cout object.
The sample code is shown below.

#include <iostream>

int main() {
    int num;
    
    std::cout << "请输入一个整数：";
    std::cin >> num;
    
    std::cout << "您输入的整数是：" << num << std::endl;
    
    return 0;
}

In the code above, we utilized std::cout for output and std::cin for input operations. It is important to note that cout and cin are standard output and input stream objects that belong to the std namespace.