#include

#include

using namespace std;

class Header{

private:

char used;

int payloadsize;

char* data;

public:

Header (){

used = 0, payloadsize = -1, data = NULL;

}

Header (int ps, char initvalue = 0){

used = 0;

payloadsize = ps;

data = new char [payloadsize];

memset (data, initvalue, payloadsize);

}

int getsummation (){

int sum = 0;

for (int i=0; i

sum += data [i];

}

return sum;

}

};

int main (){

Header h1;

Header h2 (10);

Header* h3 = new Header (20);

cout << "Header type size " << sizeof (Header) << endl; // 1. explain

cout << "Header oject size " << sizeof (h1) << endl; // 2. explain why

cout << "Header object h2 size "<< sizeof (h2) << endl; // 3. explain why

cout << "Header object pointer size " << sizeof (h3) << endl; // 4. why

// 5. now allocate memory big enough to hold 10 instances of Header

// 6. Put 10 instances of Header in the allocated memory block, one after another wihtout overwriting

// The instances should have payload size 10, 20,..., 100 respectively

// and they should have initial values 1,2,...10 respectively

// 7. now call getsummation() on each instance using a loop, output should be:

// 10, 40, 90, ...., 1000 respectively

Header* ptr = h3 + 100;

cout <<"Printing pointer h3: " << h3 << endl;

cout <<"Printing pointer ptr: " << ptr << endl;

// 8. explain the output you see in the following

cout << "Difference " << (ptr - h3) << " objects" << endl;

cout << "Difference " << ((char*) ptr - (char *)h3) << " bytes" << endl;

}