Infix to postfix in c

Question

While writing program for infix to postfix in why we use #define max 50, instead of int max=50

Answer 1

Code manutence. Like with you have a program that defines a x size to read a input but the book is y size and y > x. So you will need tp change and is more easier change the value one time than change multiple values or single but in middle of code.
Here a code of mine:
https://code.sololearn.com/cG7ieJFrOa2J/?ref=app
In this code i needed to test buffer size multiple times. And it was easy because i used #define for this.
Edit: you can use #define for making a macro or define a constant that no will change like PI. In mine code case it was for represent the limit (max and min)