assig array != struct ?

[langog.info]

hi:
in c,i use :

int a[5],b[5]={1,2,3,4,5};
struct {
int c[5];
}aaa,bbb;

bbb.c[0]=bbb.c[1]=bbb.c[2]=bbb.c[3]=bbb.c[4]=2;

1) a=b; //compile error;
2) aaa=bbb

1.what's differ between 1),2)?
2.why i can't init bbb by bbb.c[5]={2,2,2,2,2};

thx!!

 

[Richard Heathfield]

(e-mail address removed) said:

hi:
in c,i use :

int a[5],b[5]={1,2,3,4,5};
struct {
int c[5];
}aaa,bbb;

bbb.c[0]=bbb.c[1]=bbb.c[2]=bbb.c[3]=bbb.c[4]=2;

1) a=b; //compile error;
2) aaa=bbb

1.what's differ between 1),2)?

You can't assign to an array. You /can/ assign to a struct. Why? Well,
because. There doesn't seem to be any better reason than that. It's
just one of them things.

2.why i can't init bbb by bbb.c[5]={2,2,2,2,2};

struct {
int c[5];
} aaa, bbb = { { 2, 2, 2, 2, 2 } };

 

[langog.info]

(e-mail address removed) said:

hi:
in c,i use :

int a[5],b[5]={1,2,3,4,5};
struct {
int c[5];
}aaa,bbb;

bbb.c[0]=bbb.c[1]=bbb.c[2]=bbb.c[3]=bbb.c[4]=2;

1) a=b; //compile error;
2) aaa=bbb

1.what's differ between 1),2)?

You can't assign to an array. You /can/ assign to a struct. Why? Well,
because. There doesn't seem to be any better reason than that. It's
just one of them things.

2.why i can't init bbb by bbb.c[5]={2,2,2,2,2};

struct {
int c[5];

} aaa, bbb = { { 2, 2, 2, 2, 2 } };

thx rjh!!
but the answer without reason.
if i want to change the value of bbb ,how to do it simply?
can u figure the c's object modle in memory?

 

[Nick Keighley]

Could you not not use abbreviations like "u"? It is clearer if you use
"I"
rather than "i". Things are clearer if you use standard english rather
than
txt-speak.

Also don't post the same thing multiple times.

int a[5],b[5]={1,2,3,4,5};
struct {
int c[5];
}aaa,bbb;

bbb.c[0]=bbb.c[1]=bbb.c[2]=bbb.c[3]=bbb.c[4]=2;

1) a=b; //compile error;
2) aaa=bbb

1.what's differ between 1),2)?

You can't assign to an array. You /can/ assign to a struct. Why? Well,
because. There doesn't seem to be any better reason than that. It's
just one of them things.

2.why i can't init bbb by bbb.c[5]={2,2,2,2,2};

struct {
int c[5];

} aaa, bbb = { { 2, 2, 2, 2, 2 } };

don't quote .sigs (anything after "--<space>") unless you are
commenting
on them

but the answer without reason.

yep. The answer is "because" or "ask Dennis" (the designer of the
language).

if i want to change the value of bbb ,how to do it simply?

I suppose you could set up a default value.

struct
{
int c[5];
} aaa, bbb, def_bbb = { { 2, 2, 2, 2, 2 } };

/* do things to bbb */

/* reset to default */
bbb = def_bbb;

can u figure the c's object modle in memory?

"model"? Why? Why do you need to know this? What are you trying to do?
The ints of C will be in increasing order in memory. Some types may
need padding
between the array elements, but this is unlikely with ints.