in c++ main function is the entry point to program how i can change it to an other function?

Question

I was asked an interview question to change the entry point of a C or C++ program from main() to any other function. How is it possible?

Answer 1

It's very simple:

As you should know when you use constants in c, the compiler execute a kind of 'macro' changing the name of the constant for the respective value.

just include a #define argument in the beginning of your code with the name of start-up function followed by the name main:

Example:

#define my_start-up_function (main)