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Dumb-struct

 
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Guest
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Dumb-struct
PostPosted: Mon Jun 14, 2004 9:43 am     Reply with quote

Searched on "struct initialize" and didn't find much.

I tried to clean up a project (PCM 3.185 on a PIC16F877) that works fine. Wanted to put some of my constants in structures like:

struct axisconsts
{
float offset;
float sense;
} x_axis, y_axis;

x_axis.offset = 3.1459;
x_axis.sense = 2.71828;
.... and so forth.

The compiler complains that the line with x_axis.offset needs a "(". This is right out of the book, basically. What is wrong? Take out the struct initialization lines and it compiles fine.

Thanks.
LloydSargent



Joined: 11 Jun 2004
Posts: 13

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PostPosted: Mon Jun 14, 2004 9:57 am     Reply with quote

Hmm...

I tried it and it worked fine (not the answer you want to hear!).

Where do you have

x_axis.offset = 3.1459;
x_axis.sense = 2.71828;

In your code?

Cheers,

Lloyd
SteveS



Joined: 27 Oct 2003
Posts: 126

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PostPosted: Mon Jun 14, 2004 9:57 am     Reply with quote

You need to put the initializations inside a function or main.

-or initialize them like this (based on K&R)-

Code:

struct axisconsts
{
float offset;
float sense;
};

struct axisconsts x_axis = {3.1459 , 2.789 };
struct axisconsts y_axis = {1.23, 4.56 };


- SteveS
LloydSargent



Joined: 11 Jun 2004
Posts: 13

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PostPosted: Mon Jun 14, 2004 10:09 am     Reply with quote

Okay, before you get too confused, HERE are the only valid ways to initialize the struct.

1ST
Code:


struct axisconsts
{
float offset;
float sense;
};

struct axisconsts x_axis= {3.1459, 2.71828};

main()
{
}


2ND
Code:


struct axisconsts
{
float offset;
float sense;
} x_axis, y_axis;

main()
{
  x_axis.offset = 3.1459;
  x_axis.sense = 2.71828;
}


3RD
Code:


main()
{
  struct axisconsts
  {
    float offset;
    float sense;
  } x_axis, y_axis;

  x_axis.offset = 3.1459;
  x_axis.sense = 2.71828;
}


4th

Code:


struct axisconsts
{
float offset;
float sense;
} x_axis= {3.1459, 2.71828};

main()
{
}


This is off the top of my head. I may have missed one...

Cheers,

Lloyd
Guest
Guest







Struct initialization
PostPosted: Mon Jun 14, 2004 10:39 am     Reply with quote

OK folks -

Thanks very much and let me try some of these suggestions.

Michael
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