1. Chapter: 10
Pointers
Lecture: 38 and 39
Date: 18.10.2012

2. Accessing Addresses
int main()
{ int IntVar1 = 25;
int IntVar2 = 11;
int* ptr; //pointer to integers
ptr = &IntVar1; //pointer points to IntVar1
cout << ptr << endl //print the address of IntVar1
ptr = &IntVar2
cout << ptr << endl //print the address of IntVar2
getch();
return 0; }

3. Accessing Contents
int main()
{ int IntVar1 = 25;
int IntVar2 = 11;
int* ptr; //pointer to integers
ptr = &IntVar1; //pointer points to IntVar1
cout << *ptr << endl //print the content of IntVar1
ptr = &IntVar2
cout << *ptr << endl //print the content of IntVar2
getch();
return 0; }

4. Array Accessing Using Index
int main()
{
int intarray[5] = { 31, 54, 77, 52, 93 };
for(int j=0; j<5; j++)
cout << intarray[j] << endl;
getch();
return 0;
}

5. Array Accessing Using Pointers
int main()
{
int intarray[5] = { 31, 54, 77, 52, 93 };
for(int j=0; j<5; j++)
cout << *( intarray + j ) << endl;
getch();
return 0;
}

6. Counting by Integers - Arrays

7. Passing Arguments to Functions
 Arguments can be passed to functions in three
different ways: (i) by value, (ii) by reference, and (iii) by
pointers
 A function can change the values in a calling function if
the arguments are passed by a reference or by a pointer.

8. Pass-by-Reference
void centimize(double& );
int main()
{ double var = 2.5;
centimize(var);
cout << var << endl;
getch(); return 0; }
void centimize(double& v)
{ v = v * 100; }

9. Pass-by-Pointer
void centimize(double* );
int main()
{ double var = 2.5;
centimize(&var);
cout << var << endl;
getch(); return 0; }
void centimize(double* ptrd)
{ *ptrd = *ptrd * 100; }

10. Pointer Passed to Function

11. Passing Arrays to Function
const int MAX = 5;
void centimize(double*);
int main()
{ double varray[MAX] = { 10.0, 43.1, 95.9, 59.7, 87.3 };
centimize(varray);
for(int j=0; j<MAX; j++)
cout << varray[j] << endl;
getch(); return 0; }
void centimize(double* ptrd)
{ for(int j=0; j<MAX; j++)
*ptrd++ = *ptrd * 2.54; } //*ptrd++ = *(ptrd++)

12. Pointer Passed to Function

13. Assignment # 02
(i) Write a note on sorting with an example.
(ii) What is bubble sort? Write a program implementing
bubble sort using pointers.

14. Assignment # 02
(i) Write a note on sorting with an example
(ii) What is bubble sort? Write a program implementing
bubble sort using pointers.
Viva voce for the first and second assignment is
scheduled to be conducted on 24th October.