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deperkin
Joined: 04 Feb 2009
Posts: 83
Location: PA
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| strings in structs |
 Posted: Mon Dec 17, 2012 7:51 pm |
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general C question if anyone can help please (using v4.114):
I want to create a struct:
| Code: |
struct TestInput{
int8 count;
int8 addr;
int8 port;
int8 mask;
int8 func;
int16 conn;
char cavity[2];
char circuit[4];
char description[50];
}; |
I plan on having alot of these and in Main() will this be the correct format:
| Code: | struct TestInput FWAClutch;
FWAClutch = 2,6,18,1,0,39,6,"3115","MIXER & FWA CLUTCH";
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I have tried this:
| Code: |
struct TestInput FWAClutch = 2,6,18,1,0,39,6,"3115","MIXER & FWA CLUTCH";
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and I get errors.
I just want to make sure the correct numbers are showing up in the struct correctly.
Unfortunately when I try this:
| Code: |
struct TestInput FWAClutch;
FWAClutch = 2,60000000000000,18,1,0,39,6,"3115","MIXER & FWA CLUTCH";
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I still get it to compile with the same RAM/ROM size....
Thanks for the help.
Last edited by deperkin on Mon Dec 17, 2012 8:59 pm; edited 2 times in total |
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deperkin
Joined: 04 Feb 2009
Posts: 83
Location: PA
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| brackets |
| Posted: Mon Dec 17, 2012 8:36 pm |
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If I try this:
| Code: | struct TestInput FWAClutch;
FWAClutch = {2,6,18,1,0,39,6,"3115","MIXER & FWA CLUTCH"}; |
I get the error: "A numerical expression must appear here." and highlights the first curly bracket. |
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deperkin
Joined: 04 Feb 2009
Posts: 83
Location: PA
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| another trial |
| Posted: Mon Dec 17, 2012 9:38 pm |
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I have also tried this:
| Code: | struct _TestInput{
int8 count;
int8 addr;
int8 port;
int8 mask;
int8 func;
int16 conn;
char cavity[2];
char circuit[4];
char description[50];
};
struct _TestInput FWAClutch = { 2, 6, 18, 1, 0, 39, 6, "3115", "MIXER & FWA CLUTCH" }; |
following some examples and I get an error "Expression must evaluate to a constant" and it highlights the comma after "3115"
also just a note, it doesnt seem to make a difference if I use typedef |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Dec 17, 2012 11:09 pm |
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The program shown below compiles OK with vs. 4.114.
I fixed it mainly by putting braces around all the array init values.
Other comments:
1. You are not allowing enough room in the circuit[] array for the
string terminator byte. I increased the size by 1 to allow for this.
2. You are not initializing the 2nd element in the cavity[] array.
The compiler will then initialize it for you, by setting it to 0.
| Code: |
#include <18F4520.h>
#fuses INTRC_IO,NOWDT
#use delay(clock=4M)
#use rs232(baud=9600, UART1, ERRORS)
struct _TestInput{
int8 count;
int8 addr;
int8 port;
int8 mask;
int8 func;
int16 conn;
char cavity[2];
char circuit[5];
char description[50];
};
struct _TestInput FWAClutch = { 2, 6, 18, 1, 0, 39, {6}, {"3115"}, {"MIXER & FWA CLUTCH"} };
//=========================================
void main()
{
while(1);
} |
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deperkin
Joined: 04 Feb 2009
Posts: 83
Location: PA
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| thanks |
| Posted: Mon Dec 17, 2012 11:12 pm |
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Thanks PCM programmer...
you are correct as usual!
I appreciate the help. |
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