Vars

ID:1936297
 
Sep 15 2015, 5:33 am
(See the best response by Ter13.)
Heya, so Imagine these 2 situations:

Situation A
var/Pi = 3.14


Situation B
var/const/Pi = 3.14


Pi is a cosntant value and so it should be defined as a const var (Situation B). This is logical, but couldn't I just define it as a normal variable, like in Situation A?

What is the difference between those 2 situations? Will those vars be handled differently by the computer?

I do understand that if I define a variable as constant I can't change its value but is that the only difference between a const var and a non const var?

Thanks as always,
,MistY
Sep 15 2015, 6:09 am
Best response
const values can't be changed, and when they belong to objects, aren't saved. That's the only difference.
Sep 15 2015, 6:12 am
Oh Thanks Ter.
Sep 15 2015, 9:53 am
IMO, you're better off using a #define for this--and of course using more digits of precision. Using #define means that any math that needs to be done with the value can be done at compile time. For instance, in x*PI/180, the fraction PI/180 can be done beforehand if you enclose it in parentheses. This reduces both the size of your code and the work done at runtime.