• C

Newbie question about structs


// this struct contains pointers (a,b,c,d,e,f,g)  to other structs
// an array of structs?

typedef struct
{
int a
int b
int c
int d
int e
int f
int g
} s;
typedef s *s;

int x;
int y=6;
int *ptr;

// How do I  for next loop associate a ptr to each member of the array ??

for(x=0; x<y;x++)
{
ptr = each succesive member of *s ?????????
// do something with the pointed to structs
}
????????????

Thanks  
theorangeAsked:
Who is Participating?
 
rbrCommented:
thx for the points!
0
 
theorangeAuthor Commented:
should I rephrase this, how do I get each individual pointer ( the array members) successively ???????
0
 
trilloCommented:
Wait, wait wait..... There are a lot of errors in your code and in your comments:

1)
>>// this struct contains pointers (a,b,c,d,e,f,g)  to other structs
I don't see any pointers in your struct, I only see variables, but not pointers

2)
>>// How do I  for next loop associate a ptr to each member of the array ??
I don't see any array. (A struct is NOT the same as an array)

3)
I don't see any declaration of a "s" objcet which can be used.
----------------------------------
If I understand well, you want to make a variable (int), to take the value of each MEMBER of the STRUCTURE. right?

You could use:
typedef struct
{
    int num[7]
} s;
typedef s *s;
int *ptr; //Integer that will take different values
s *any;   //object you'll use

for(int x=0; x<7; x++)
{
    ptr = &any->num[x];
    // do something with the pointed to structs
}

-------------------------
Trillo
0
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scrapdogCommented:
int *temp;
temp = (int*)s;
for(x=0; x<y;x++)
{
  ptr = temp[x];
  // do something with the pointed to structs
}
0
 
rbrCommented:
first use
typedef struct
{
int a;
int b;
int c;
int d;
int e;
int f;
int g;
} s;
typedef s *s;

int x;
int y=6;
int *ptr;

You cant use a direct way to access to pointer in a loop
ptr= &(s->a); will be a pointer to a
ptr=&(s->b); will be a pointer to b and so on.

If you want to use a loop why don`t you use an array in your struct

typedef struct {
int a[6];
} s;
typedef s *s;

int x;
int y=6;
int *ptr;

// How do I  for next loop associate a ptr to each member of the array ??

for(x=0; xa[x]);
}

Thanks  
0
 
rbrCommented:
Sorry mistake
the lines should be
for(x=0; x<y;x++)
{
ptr = &(s->a[x]);
}

0
 
ozoCommented:
typedef s *s;
???
0
 
theorangeAuthor Commented:
to rbr and trillo

I have read your comments and you are right, I have really misrepresented the simile of the real question that myself and my partner have. (frogland, ICQ API question in the windoze section of experts exchange)

If you study that question (I know you may not have 1st hand experience with this particular piece of software) BUT if you read between the lines you might see how I came to ask this lame one !!

We would really apreciate help here and will gladly pool our points to the provider of a solution !!!!!


 
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theorangeAuthor Commented:
to rbr and trillo

I have read your comments and you are right, I have really misrepresented the simile of the real question that myself and my partner have. (frogland, ICQ API question in the windoze section of experts exchange)

If you study that question (I know you may not have 1st hand experience with this particular piece of software) BUT if you read between the lines you might see how I came to ask this lame one !!

We would really apreciate help here and will gladly pool our points to the provider of a solution !!!!!


 

0
 
theorangeAuthor Commented:
Adjusted points to 100
0
 
rbrCommented:
So what is actually your problem?
0
 
theorangeAuthor Commented:
rbr
please collect your points on this one
thanks

0
 
rsongylCommented:
Play around with these

int x[5]={1,2,3,4,5};
int *xptr;
xptr=x;
printf("%d",x[2]);       /*normal array subscript*/
printf("%d",xptr[2]);    /*subscript on pointer*/
printf("%d",*(xptr+2));  /*offset of a pointer*/
printf("%d",*(x+2));     /*offset of the array name*/

All the above statement mean the same thing. Perhaps it can help you understand more.
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