# <iostream>

**[<iostream>](https://en.cppreference.com/w/cpp/header/iostream)** provides `std::cin`, `std::cout`, `std::cerr`, `std::clog` for standard I/O. It's the C++ way to read from stdin and write to stdout/stderr.

Use `std::cout` for normal output, `std::cerr` for errors, and `std::cin` for input. For formatted output, prefer `std::format` in C++20, but iostream is portable and widely used.

## Example

This example reads a line from standard input and echoes it back, demonstrating basic stream input/output.

```cpp
// compile: g++ -std=c++11 -o iostreamexample iostreamexample.cpp
// run: ./iostreamexample
// description: reading and printing with iostream

#include <iostream>
#include <string>

int main() {
    std::cout << "enter your name: ";
    std::string name;
    std::getline(std::cin, name);
    
    std::cout << "hello, " << name << "!\n";
    
    return 0;
}
```