Introduction - If you have any usage issues, please Google them yourself
Tsinghua university ACM team training materials
All c++ program consists of function, the function is called subroutines, and each c++ program must contain a main function, the compiler (program) to translate source code into object code after the translation of the target code and some startup code, generate an executable file, the main function is the entry of the executable file, so that every c++ program one and only one main function.