Macro in C

A macro in programming refers to a fragment of code that has been given a name.

It is valid but not recommended to override inbuilt functions due to name collision, and you can’t access the default function let . for within the program

#define for(n) for(int i=0; i<n; i++) ✅

Preferred to use different name for macro

#define for_up(n) for(int i=0; i<n; i++) ✅
#define for_down(n) for(int i=n-1; i>=0; i--) ✅