Pointers to structures

[kidburla]

Again I am having pointer troubles.

#include <stdio.h>

typedef struct {
int a;
char c; } Test;
typedef Test *TestPtr;

int main ()
{
  Test t;
  TestPtr p;

  p = &t;
  *p.a = 2;
  *p.c = 'k';
  printf("%d",t.a);
  printf("%c",t.c);

  getchar();
  return 0;
}

The compiler returns the following errors:

• request for member `a' in something not a structure or union
• request for member `c' in something not a structure or union

I found in a Google search a way to do this in Classic C, but not in ANSI C. Not sure I know the correct way to do this, and my book (although otherwise brilliant) doesn't either.

Adam.

[Prelude]

Member access binds more tightly than dereferencing in this case, so you need to use parens:

(*p).a = 2;
(*p).c = 'k';

Or you could use the funny little arrow thingie:

p->a = 2;
p->c = 'k';

p.s. You shouldn't hide a level of indirection with a typedef, it's confusing.