The Types Program

Your mission:

Write a C or C++ program that creates three structures
Print out information about those structures
Discover how the compiler works in laying out structures

Does it ever pad a structure?
Does it ever reorder a structure?
How many bytes does an int, float, short, char, long, and double need?
What are the allignment restrictions of a char, an int, and a double.

Extra Credit

Run it on more than one type of machine.
Run it with more than one compiler.

Here are the three structures you should use:

struct one {
      int a;
      char b;
      double c;
};

struct two {
      char d;
      short e;
       long f;

Make up one yourself.

Here is a sample program using structures

#include <iostream.h>

main() {
        struct one {
                char a;
                int b;
                float c;
        };

        struct one o;
        cout << "O is " << sizeof(o) << " bytes large\n";
        cout << "O starts at " << (unsigned int)&(o) << endl;
        cout << "o.a starts at " << (unsigned int)&(o.a) << endl;
        cout << "o.a is " << sizeof(o.a) << " bytes large\n";
        cout << "o.b starts at " << (unsigned int)&(o.b) << endl;
        cout << "o.b is " << sizeof(o.b) << " bytes large\n";
        cout << "o.c starts at " << (unsigned int)&(o.c) << endl;
        cout << "o.c is " << sizeof(o.c) << " bytes large\n";
}