What will the given code print?

#include <iostream>

struct A {
  char a;
  int b;
  char c;
};

int main() {
  std::cout << sizeof(A);
}

1
6
9
12
Code does not compile
Depends on platform, compiler and its settings

Explanation

The size of the int type varies on different platforms. The size of the structure containing data types of various sizes depends on the type of alignment used by the compiler. The type of alignment may depend on the compiler settings.
Read more: Typical alignment of C structs on x86