B.Tech. (I) - ICP-132 (2009)
				Assignment 10

Level 0
-------

1. Let ptr_i be a pointer to an integer 'i'. Show how to change the 
value of 'i' using the pointer.

2. Print the address of ptr_i and i as given in the above example.

3. Print the address, value stored and the value stored at the pointed 
address for ptr_i using three different functions.


Level 1
-------

1. Let x and y be two integers with values 10 and 20. Write a function 
'swap' that takes the addess of these two integers and swaps their 
values.

2. Let ptr_x and ptr_y be the pointers to x and y as discussed above. 
Write a function ptr_swap that exchanges the address of these two 
pointers using references.

3. Let ptr_x and ptr_y be the pointers to x and y as discussed above. 
Write a function ptr_swap that exchanges the address of these two 
pointers using pointers.


Level 2
-------

1. Let A1 be a 1-dimensional array of size 10. Show how to store the 
first ten odd numbers in the array. Print these values with and without 
using their indices!

2. In the above problem A1 is itself a pointer. Let B1 be a pointer that 
is A1+5. Can one access an element B1-2? Show if it is allowed and find 
the values of *(A1+2) and *(B1-1).

3. Let A2[4][4] be a two-dimensional matrix such that A[i][j]=(10*i)+j. 
What values will be printed? Also write a function mat_add that adds two 
matrices of order 4x5. (See "Pointer Arithmetic and Multiple Indirection"
at http://www.technoplaza.net/programming/lesson9.php)
Code:
	#include <iostream>

	using namespace std;

	int main()
	{
		int A2[4][4];

		for (int i=0; i<4; i++) {
			for (int j=0; j<4; j++) {
				A2[i][j]=10*i+j;
			}
		}

		cout << **(A2+1) << endl;
		cout << *(*(A2+2)+3) << endl;

		return 0;
	}


4. Let A3[4][4][4] be a two-dimensional matrix such that A[i][j]=(10*i)+j.
What values will be printed? (3-D arrays are pointer-of-pointers-of-pointers.)
Code:
	#include <iostream>

	using namespace std;

	int main()
	{
		int A3[4][4][4];

		for (int i=0; i<4; i++) {
			for (int j=0; j<4; j++) {
				for (int k=0; k<4; k++) {
					A3[i][j][k]=100*i+10*j+k;
				}
			}
		}

		cout << ***(A3+1) << endl;
		cout << **(*(A3+2)+3) << endl;
		cout << *(*(*(A3+2)+3)+1) << endl;

		return 0;
	}

5. Let 'add' and 'mult' be two functions with same type of arguements. 
Demonstrate usage of switch and pointers to function by executing add to 
do something if a bool variable is true and mult if it is false.

6. Let 'add' and 'mult' be two functions with same type of arguements. 
Demonstrate usage of switch and pointers to function by executing add to 
do something if a there are even number of 1s in the binary 
representation of an integer 'n' given as input and mult otherwise. (For 
instance, if 5 is stored as an integer and if integer has 4 bytes, then 
the binary representation could be 00000000 00000000 00000000 00000101. 
Here there are 2 ones and the rest 16 are zeros.

7. Demonstrate adding of two objects through overloading '+' using their 
pointers.

8. Connect an object of class P defined below to another object of the 
same class. Print the content of the second object (ob2) using the 
address stored in the first object (ob1). To do this, you may use the 
following code by completing the line with cout. Similarly demonstrate
the same for a dynamically created object.
Code:
	#include <iostream>

	using namespace std;

	class C {
		public:
			int x;
			C *ptr_C;
	};

	int main()
	{
		C *ob_ptr;

		C ob1;
		C ob2;

		ob2.x=10;
		ob1.ptr_C=&ob2;

		ob_ptr=new C;  // create an object of type C
		(*ob_ptr).x=20;  // set value of x as 20
		ob2.ptr_C=ob_ptr;  // store the address of this object

		cout <complete this to print ob2.x using ob1>;
		cout <complete this to print x in object created using ob2>;

		return 0;
	}

9. Write a program to add n objects of class C as above and connect them 
in the similar way. Print all the values of the objects using their 
pointers stored in another objects.