c++ what is #define
// #define is a macro that lets you use an alias name to
// make code more readable. During C++'s preproccessing stage, your macro
// will be replaced with the suitable code needed for proper compiling.
#include <iostream>
// used to define constants, types, functions and more....
#define SIZE 5
#define MacroInt int
#define getmax(a,b) ((a)>(b)?(a):(b))
int main(){
MacroInt myIntAsMacro = 7;
std::cout<< getmax(SIZE, myIntAsMacro); // will return 7
}