It is a variable type composed of integers, such as 0, 1, 2, 3, 4. ...

For example, the amount of blood and money in a simple game are both integer types.

The return value is integer, which means that after a function is executed, the final result is an integer variable.

You can display this variable directly, or you can use commands such as judgment to process the return value, such as returning 1 execute function 1, returning 2 to execute function 2, and ending the program if the return value is greater than 10.

It is recommended to use it flexibly after thorough understanding, not by rote.