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strings in structs

 
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deperkin



Joined: 04 Feb 2009
Posts: 83
Location: PA

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strings in structs
PostPosted: Mon Dec 17, 2012 7:51 pm     Reply with quote
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";

I have tried this:
Code:

struct TestInput FWAClutch = 2,6,18,1,0,39,6,"3115","MIXER & FWA CLUTCH";

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";

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
deperkin



Joined: 04 Feb 2009
Posts: 83
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brackets
PostPosted: Mon Dec 17, 2012 8:36 pm     Reply with quote
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.
deperkin



Joined: 04 Feb 2009
Posts: 83
Location: PA

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another trial
PostPosted: Mon Dec 17, 2012 9:38 pm     Reply with quote
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
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Dec 17, 2012 11:09 pm     Reply with quote
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); 
}
deperkin



Joined: 04 Feb 2009
Posts: 83
Location: PA

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thanks
PostPosted: Mon Dec 17, 2012 11:12 pm     Reply with quote
Thanks PCM programmer...

you are correct as usual!

I appreciate the help.
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