enum musings

[Gavin Pinto]

You might look at this ccs thread and ask many questions

https://www.ccsinfo.com/forum/viewtopic.php?t=23400

Now I will show some interesting enum statements that compile with ccs.



1. enum{u,v,w};

2. enum {a,b,c} *ep;

3. enum ee{x,y,x}*ez;

4. enum xy{i,j,k}uv;

5.enum {a=0xFFFFFFFF};

6.enum{a=0xFFFFFFFF}ep;

7.enum{a=4294967298}ep; // Compiles in #device ANSI mode (signed)why ?????

8. enum{a=0b11111111111111111111111111111111}ep; //Compiles in #device ANSI mode (signed) why?????

9.enum{a=-2147483649}ep;//Compiles in #device ANSI mode (signed) why?????

10. enum{a=-214748364987654321}ep;//Compiles in #device ANSI mode (signed) why?????

11. enum{a=023}ep; //Octal representation

12. enum{a=023}*ep; //Octal representation

13. enum{q=-2.51432};

14. enum{q='u'};

15. enum{a=023+1.1257-0x555+0b101110}ep;





Those that do not compile

1. enum {a=0xFFFFFFFF}*ep;

*** Error 84 : Pointers to bits are not permitted

2.enum{a=0x100000000}ep;

***Error 103 : Constant out of the valid range

enum{a=040000000000}ep; //Octal representation

***Error 103 : Constant out of the valid range



CCS compiler version 4.104 PCH command-line running in MPLAB. Processor PIC18F8722


Any questions or discussions on the above statements?

C Enumeration Declarations

http://msdn.microsoft.com/en-us/library/whbyts4t.aspx
_________________
Clear Logic

[Gavin Pinto]

compiler version PCH 4.104
_________________
Clear Logic

[Wayne_]

Octal representation begins with a 0 not an O

[Gavin Pinto]

[GPinto]

I will now examine what is actually in the enumerated constants as no type checks were done and compiler accepted all sorts of big or wrong values