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Richter
Joined: 18 Mar 2005
Posts: 8
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| size of int, chars displaying big numbers!! |
 Posted: Fri May 13, 2005 7:13 am |
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Hi there I`ve got another problem:
I`m using PIC 18f6720 and the newest CCS C Compiler (finally)!
Where should I start?
1. Is there a difference between an interger and a char?
when I use the sizeof() function and print it on screen it will always say 1 Byte!
2. When I try to search the maximum of the number, an integer can display it s always 127, it doesn t matter if it s signed or unsigned...
3. When I use the function of malloc(), It will allocate memory till 199 Bytes I think so...
I have tried with this structure:
| Code: |
struct message_Handler
{
int type;
int value;
int status;
char text[196];
struct message_Handler* next;
};
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I have raised the number of the array and when I insert a number over 196 the programm will crash!!
I know the manual says when I try to allocate more than a integer can represent as a number it won t go!
Is my struct about the limit of an integer???
But why these different numbers???
plz help me guys I don t understand these irregularities!
_________________
Why I get all these strange problems ? |
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Humberto
Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata
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| Posted: Fri May 13, 2005 8:20 am |
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| Quote: |
1. Is there a difference between an interger and a char?
when I use the sizeof() function and print it on screen it will always say 1 Byte!
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Integer size depends of the implantation. In CCS int, int8, byte and char are 8 bit integers.
See Data Types in Page 81 pdf CCS Manual.
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2. When I try to search the maximum of the number, an integer can display it s always 127, it doesn t matter if it s signed or unsigned...
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??? Tell us where/how do you search that.
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3. When I use the function of malloc(), It will allocate memory till 199 Bytes I think so...
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#device *=16 is the trick.
Read this topic regarding allocating variables and RAM banks in Page 247
Best wishes,
Humberto |
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Ttelmah
Guest
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| Posted: Fri May 13, 2005 10:04 am |
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I suspect the '127', probably comes from using printf, with the wrong conversion. If he is printing the numbers with %d, the maximum that can be printed from a value, will be 127, since this is the print conversion for a signed integer. If instead he uses %u, the value allowed will go up to 255.
Best Wishes |
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Guest
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| Posted: Tue May 17, 2005 5:24 am |
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Thnx Humberto and Ttelman.
1. Is ok. How couldn t see this topic in the manual??
2. It s like Ttelman said i tried to print thenumbers and used %d
@ 3. U mean to read the example programs? The page is about them...
I suspect u mean #define a numeber and use them in the malloc function except the function sizeof() !??!
Thnx again!  |
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