what's diffs in the prog?

[guoliang]

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!!

 

[Alan Curry]

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)?

One involves arrays, the other involves structs. Assigning structs is legal,
assigning arrays isn't.

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

Pick one of these:

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

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

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

struct { int c[5]; } aaa, bbb;
memcpy(&bbb.c, (int[5]){2,2,2,2,2});

struct foo { int c[5]; } aaa, bbb;
bbb=(struct foo){.c={2,2,2,2,2}};

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

 

[Nick Keighley]

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};

because this is assignment not initialisation, although the syntax
looks superficially similar they are not the same thing.