Printf for struct? (C/C++, VC2008)

Question

Just build&run this in VC2008:

struct A
{
   int a;
   int b;
   int c;
};
A a = { 10, 20, 30 };
printf("%d %d %d\n", a);

Is it normal?

10 20 30

I'd like to cast! but it don't works:

struct A
{
   int a;
   int b;
   int c;
   operator int()
   {
      return a + b + c;
   }
};
A a = { 10, 20, 30 };
printf("%d\n", a);

output is only:

10

I need auto-casting for template-utility. Here it is: https://code.google.com/p/boolib/source/browse/boolib/crypt/ShakedValue.h It should hide in memory value, that any hack-programms (ArtMoney) can't find value.

And one more trick usage: Print private members of the struct/class

Answer 1

If you want a cast, then cast it:

struct A
{
   int a;
   int b;
   int c;
   operator int()
   {
      return a + b + c;
   }
};
A a = { 10, 20, 30 };
printf("%d\n", (int)a);

the output will be

60