c include

Explanation of the "c include" in C++

The #include directive in C++ is used to include the contents of another file in the current file. This is typically used to include header files that contain function prototypes, definitions, and other declarations that are necessary for the program to compile and run correctly.

When you use the #include directive, the preprocessor replaces the directive with the contents of the specified file. This allows you to use the functions, variables, and other declarations from the included file in the current file.

For example, the following code includes the contents of the <iostream> header file:

#include <iostream>

After this directive, you can use the functions and other declarations from the <iostream> header file in your program.

It's important to note that the angle brackets (<>) are used to include system header files, while double quotes ("") are used to include user-defined header files.