Thread: initializer element is not constant...

Originally Posted by John Connor

Ok.
As a matter of fact I want them to be global and static as well.
I read about the #define environment to create macros but I'm not sure if

Code:

#define t_max  t_max 2.0*3.1415926535897932384626433832795

results in a floating point t_max or what.

Thanks.

That's going to get you a lot of errors.

#define macros are just search-n-replace; if you did

Code:

#define t_max (2.0*3.1415926535897932384626433832795)

would simply make the preprocessor remove all occurrences of the token t_max and replace it with that ... thing on the right. The compiler would never see a variable t_max at all.

Originally Posted by tabstop

That's going to get you a lot of errors.

#define macros are just search-n-replace; if you did

Code:

#define t_max (2.0*3.1415926535897932384626433832795)

would simply make the preprocessor remove all occurrences of the token t_max and replace it with that ... thing on the right. The compiler would never see a variable t_max at all.

Thanks I realised my mistake in the previos reply and removed the t_max t_max...

Now, if I use the expression

Code:

#define t_max 2.0*3.1415926535897932384626433832795

Can i call t_max expecting it to be double precision?

Thanks

Originally Posted by tabstop

Yes, in that any constant with a decimal point in it in a C program is double unless you tag it otherwise: 1.0 is double, 1.0f is float.

Thanks a lot! That really helped me.