[c++] symbolic constants - Tilted Forum Project Discussion Community

Locke · 02-16-2005, 07:55 PM

I'm having trouble figuring out how to represent the value of pi in two different ways using symbolic constants. The book is giving me no useful info. Could I get some help? Thanks.

username · 02-16-2005, 08:09 PM

Symbolic constants are just defines.

So #define PI 3.14 is one way to represent PI

Locke · 02-16-2005, 08:29 PM

hey thanks. Could I also do something like: Const PI = 3.14 as the second way. Or can I just do #define PI 3.1415?

username · 02-16-2005, 08:48 PM

#define PI 3.1415 is the same method as #define PI 3.14 and Const PI = 3.14 wouldn't be a symbolic constant. Think about what #define does. It replaces the token PI in the source code with the number 3.14 before the code is compiled. Using this idea, a #define could be more than a number...

Molo · 02-16-2005, 09:34 PM

Keep in mind though that if you are using the term const, you need a type, it would be

const double PI = 3.14

02-16-2005, 07:55 PM	#1 (permalink)
Locke Insane Location: The reddest state ever. :(	[c++] symbolic constants I'm having trouble figuring out how to represent the value of pi in two different ways using symbolic constants. The book is giving me no useful info. Could I get some help? Thanks. __________________ CUBS WIN, CUBS WIN!!!! - Pat Hughes "Don't surround yourself with yourself." Yes

02-16-2005, 08:29 PM	#3 (permalink)
Locke Insane Location: The reddest state ever. :(	hey thanks. Could I also do something like: Const PI = 3.14 as the second way. Or can I just do #define PI 3.1415? __________________ CUBS WIN, CUBS WIN!!!! - Pat Hughes "Don't surround yourself with yourself." Yes

02-16-2005, 09:34 PM	#5 (permalink)
Molo Upright Location: Waterloo	Keep in mind though that if you are using the term const, you need a type, it would be const double PI = 3.14 __________________ Everyone on the Universal Serial Bus!

02-16-2005, 08:09 PM	#2 (permalink)
username Insane	Symbolic constants are just defines. So #define PI 3.14 is one way to represent PI

02-16-2005, 08:48 PM	#4 (permalink)
username Insane	#define PI 3.1415 is the same method as #define PI 3.14 and Const PI = 3.14 wouldn't be a symbolic constant. Think about what #define does. It replaces the token PI in the source code with the number 3.14 before the code is compiled. Using this idea, a #define could be more than a number...