What is the usage of iostream in C++?

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:

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

The basic steps for using iostream are as follows:

  1. Can you lend me a hand with this project?
  2. Input operation can be performed using the cin object, while the output operation can be done using the cout object.
  3. 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.

 

 

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