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Compiler error

 
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Christophe



Joined: 10 May 2005
Posts: 323
Location: Belgium

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Compiler error
PostPosted: Fri May 20, 2005 9:37 am     Reply with quote
Float Vbat;
int floatgrootte = sizeof(Vbat);

? Why do I get an error ?

I want to get the size of a float (should return '4' bytes)


thx
valemike
Guest
PostPosted: Fri May 20, 2005 12:04 pm     Reply with quote
I'm pretty sure that
sizeof(float) will work.

or if you have

struct mystruct
{
...
...
};

you can do a sizeof(mystruct) i think.

i guess its a c syntax thing. since i don't have a k&r book in front of me, i can't tell you for sure.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri May 20, 2005 12:47 pm     Reply with quote
Christophe, the answer is "go simple", and "make a test program".
The following program displays this result: 4

Code:
#include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

void main()
{
int floatgrootte;
float Vbat;

floatgrootte = sizeof(Vbat);

printf("%d", floatgrootte);

while(1);
}
Ttelmah
Guest
PostPosted: Fri May 20, 2005 2:18 pm     Reply with quote
I think the problem is between the difference in 'runtime' code, and 'compile time' code. Sizeof(Vbat), requires that the variable 'Vbat' actually exists (which is not true at 'compile time'), while 'Sizeof(float)', only requires the understanding of the data type. Sizeof(Vbat), will work fine at runtime (as PCM programmer points out).
So the two choices are:
1)
Code:

Float Vbat;
int floatgrootte = sizeof(Float);


or 2):
Code:

Float Vbat;
int floatgrootte;
floatgroote = sizeof(Vbat);


The second evaluates 'sizeof', at runtime, rather than at compile time, and again will work.

Best Wishes
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