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Aug 31st, 2009

basic issues with struct

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I'm having some trouble using struct which I can't seem to figure out. it seems to be following all the examples perfectly, i've tried to break it down to it's simplest block and nothing. Can somebody please tell me why this won't compile?

C Syntax (Toggle Plain Text)
#include <stdio.h>
 
typedef struct a{
	char a[25][12]={"a", "b", "c"};
	int b[12]={10, 5,1};
};
 
struct test{
	char a[25][12]={"a", "b", "c", "d"};
	int b[12]={2, 1,1,3};
	int c[12]={1,1,1,2};
};
 
int main (){
 
 
	return 0;
}
#include <stdio.h>

typedef struct a{
	char a[25][12]={"a", "b", "c"};
	int b[12]={10, 5,1};
};

struct test{
	char a[25][12]={"a", "b", "c", "d"};
	int b[12]={2, 1,1,3};
	int c[12]={1,1,1,2};
};

int main (){


	return 0;
}

I get this error
error C2143: syntax error : missing ';' before '='

but this error doesn't make much sense to me.

TIA.

Last edited by MaestroRage; Aug 31st, 2009 at 6:30 pm.

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MaestroRage

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Aug 31st, 2009

Re: basic issues with struct

You can't assign anything inside a structure declaration. A structure declaration just defines a type. It's like a blueprint; you're telling the compiler, "if I ask you to create a Something, this is what I want it to look like." An example of a structure declaration would be

C Syntax (Toggle Plain Text)
struct Something {
    int x, y;
    double zoom;
};
struct Something {
    int x, y;
    double zoom;
};

When you declare an instance of a structure, you're actually using memory. Here I create a variable of type Something:

C Syntax (Toggle Plain Text)

struct Something variable;

Since this is a variable, it can be initialized as you were doing above.

C Syntax (Toggle Plain Text)
struct Something variable = {1, 2, 5.0};
struct Something variable = {1, 2, 5.0};

Of course, you can always do it manually too.

C Syntax (Toggle Plain Text)
struct Something variable;
variable.x = 1;
variable.y = 2;
variable.zoom = 5.0;
struct Something variable;
variable.x = 1;
variable.y = 2;
variable.zoom = 5.0;

Just think of a structure as a new type, like int or char -- not a built-in type, but rather a type you've defined in terms of built-in types (or other structures).

dwks

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Aug 31st, 2009

Re: basic issues with struct

aaah!

I knew it had to be something simple like that. I'm having a terrible off day I can't believe I didn't see that.

Thanks a lot for the quick and very informative post!

MaestroRage

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