initializing struct

[Carramba]

Hi!
I have a big struct and I want to initialize it at once, but I get parse
error before "{" compiler error. can't it by done?

#include <stdio.h>
#include <stdlib.h>

typedef struct{
int b;
int c;
int d;
int e;
}A;

A *a;

int main(void) {

a = malloc(4 * sizeof (*a));
a = {1,1,4,5}; //there is error from my compiler
printf("%d ; %d\n", a->b+a->d, a->c*a->e);

free(a);
return 0;
}

is this is bad way to init struct how one should do?

[Ian Collins]

Carramba wrote:

Hi!
I have a big struct and I want to initialize it at once, but I get parse
error before "{" compiler error. can't it by done?

#include <stdio.h>
#include <stdlib.h>

typedef struct{
int b;
int c;
int d;
int e;
}A;

A *a;

int main(void) {

a = malloc(4 * sizeof (*a));
a = {1,1,4,5}; //there is error from my compiler

You can't assign a static initialiser to a pointer. You could write

A a[4] = {{1},{1},{4},{5 }};

--
Ian Collins.

[Joachim Schmitz]

"Carramba" <ca******@examp le.comschrieb im Newsbeitrag
news:f4******** **@aioe.org...

Hi!
I have a big struct and I want to initialize it at once, but I get parse

No, you have a pointer to a struct.

error before "{" compiler error. can't it by done?

#include <stdio.h>
#include <stdlib.h>

typedef struct{
int b;
int c;
int d;
int e;
}A;

That's not particulary large...

>
A *a;

A b = {1,2,3,4};

int main(void) {

a = malloc(4 * sizeof (*a));
a = {1,1,4,5}; //there is error from my compiler

drop these 2 lines, replace by
A *a = b;

printf("%d ; %d\n", a->b+a->d, a->c*a->e);

free(a);
return 0;
}

is this is bad way to init struct how one should do?

Can be done only as part of the definition, like I did above. And not to a
pointer to struct.

Bye, Jojo

[Joachim Schmitz]

"Ian Collins" <ia******@hotma il.comschrieb im Newsbeitrag
news:5d******** ******@mid.indi vidual.net...

Carramba wrote:

>Hi!
I have a big struct and I want to initialize it at once, but I get parse
error before "{" compiler error. can't it by done?

#include <stdio.h>
#include <stdlib.h>

typedef struct{
int b;
int c;
int d;
int e;
}A;

A *a;

int main(void) {

a = malloc(4 * sizeof (*a));
a = {1,1,4,5}; //there is error from my compiler

You can't assign a static initialiser to a pointer. You could write

A a[4] = {{1},{1},{4},{5 }};

Which would set a[0].b to 1, a[1].b to 1, a[2].b to 4 and a[3].b to 5,
leaving all the c, d and e members uninitialized resp. set to 0.

A a = {1, 1, 4, 5};
Would do...
Bye, Jojo

[Ian Collins]

Joachim Schmitz wrote:

"Ian Collins" <ia******@hotma il.comschrieb im Newsbeitrag
news:5d******** ******@mid.indi vidual.net...

>Carramba wrote:

>>Hi!
I have a big struct and I want to initialize it at once, but I get parse
error before "{" compiler error. can't it by done?

#include <stdio.h>
#include <stdlib.h>

typedef struct{
int b;
int c;
int d;
int e;
}A;

A *a;

int main(void) {

a = malloc(4 * sizeof (*a));
a = {1,1,4,5}; //there is error from my compiler

You can't assign a static initialiser to a pointer. You could write

A a[4] = {{1},{1},{4},{5 }};

Which would set a[0].b to 1, a[1].b to 1, a[2].b to 4 and a[3].b to 5,
leaving all the c, d and e members uninitialized resp. set to 0.

Correct, that's what I thought the OP wanted.

--
Ian Collins.

[Carramba]

Joachim Schmitz skrev:

"Carramba" <ca******@examp le.comschrieb im Newsbeitrag

news:f4******** **@aioe.org...

>Hi!
I have a big struct and I want to initialize it at once, but I get parse

No, you have a pointer to a struct.

>error before "{" compiler error. can't it by done?

#include <stdio.h>
#include <stdlib.h>

typedef struct{
int b;
int c;
int d;
int e;
}A;

That's not particulary large...

I only wrote compilable small program to show my problem...
I don't think there would by a point to post huge struct then this one
serves purpose.

>A *a;

A b = {1,2,3,4};

>int main(void) {

a = malloc(4 * sizeof (*a));
a = {1,1,4,5}; //there is error from my compiler

drop these 2 lines, replace by
A *a = b;

This doesn't work : "incompatib le types in assignment"

>printf("%d ; %d\n", a->b+a->d, a->c*a->e);

free(a);
return 0;
}

is this is bad way to init struct how one should do?

Can be done only as part of the definition, like I did above. And not

to a pointer to struct.

>
Bye, Jojo

Thank you!

[Ian Collins]

Carramba wrote:

>
Joachim Schmitz skrev:

>drop these 2 lines, replace by
A *a = b;

This doesn't work : "incompatib le types in assignment"

Not surprising, he probably intended to write A *a = *b;

What exactly to do want to do, create a number of structures and
initialise them all to the same value, or different values?

--
Ian Collins.

[Carramba]

Ian Collins skrev:

Carramba wrote:

>Joachim Schmitz skrev:

>>drop these 2 lines, replace by
A *a = b;

This doesn't work : "incompatib le types in assignment"

Not surprising, he probably intended to write A *a = *b;

you mean A *a= &b; ?

What exactly to do want to do, create a number of structures and
initialise them all to the same value, or different values?

[Ian Collins]

Carramba wrote:

Ian Collins skrev:

>Carramba wrote:

>>Joachim Schmitz skrev:
drop these 2 lines, replace by
A *a = b;
This doesn't work : "incompatib le types in assignment"

Not surprising, he probably intended to write A *a = *b;

you mean A *a= &b; ?

>What exactly to do want to do, create a number of structures and
initialise them all to the same value, or different values?

oops...

--
Ian Collins.

[Joachim Schmitz]

"Carramba" <ca******@examp le.comschrieb im Newsbeitrag
news:f4******** **@aioe.org...

Ian Collins skrev:

>Carramba wrote:

>>Joachim Schmitz skrev:
drop these 2 lines, replace by
A *a = b;
This doesn't work : "incompatib le types in assignment"

Not surprising, he probably intended to write A *a = *b;

you mean A *a= &b; ?

Yes, sorry, that's what I meant.