C++ Pointers

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Pointers in C++

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C++ Pointers

  1. 1. Lecture 7 ChaaND Sheikh
  2. 2. Pointers.
  3. 3. //Demonstration. #include<conio.h> Every Block is #include<iostream.h> a memory cell void main() { Cell no’s / Address int x ; float y; x = 10; Memory 4001 4002 4003 4004 4005 4006 4007 4008 4009 10 x y 4007 y = 20.0; } cout<<“Value’s of x and y = “<<x<<y; getch(); 4007 20.0 4002
  4. 4. • Pointers deals with memory address, using pointers we can access memory directly. storing pointer type entity we need special type variables. • data-type * Variable_name; Type of data stored in the address of the variable. Indirection operator
  5. 5. & * Address of (Reference) Operator. Value At Address (Indirection) operator. void main() 20.0 Value at Address. { int *int_ptr; 10 float *float_ptr; Address 4002 4007 int x = 10 ; x y Name od address float y = 20.0; cout<<“Value’s of x and y = “<<x<<“ “<<y; int_ptr = &x; float_ptr = &y; cout<<"int_ptr = "<<int_ptr; cout<<"n float_ptr = "<<float_ptr; cout<<"n value in int_pointer = "<< *int_ptr; cout<<"n value in float_ptr = "<< *float_ptr; getch(); }
  6. 6. & Address of (Reference) Operator. * Value At Address (Indirection) operator. // Demonstration. #include <iostream.h> #include<conio.h> void main () { int variable ; int *mypointer; mypointer = &variable; *mypointer = 50; 50 3722 variable Address of variable = mypointer 50 = value at address cout << "value in variable is " <<variable<<endl; getch(); } Value in variable is 50
  7. 7. //Demonstration & Address of (Reference) Operator. #include <iostream.h> * Value At Address (Indirection) operator. #include<conio.h> main () { 10 5888 2554 int x=10; int *y; 2554 5888 6550 int **z; **z x *y cout<<"Value of x = "<<x; cout<<"nAdd of x = "<<&x; Value of x = 10 cout<<"nValue of x = "<<*(&x); Add of x = 2554 y=&x; cout<<"nAdd of y = "<<&y; Value of x = 10 cout<<"nAdd in y = "<<y; Add of y = 5888 z=&y; cout<<"nAdd of z = "<<&z; Add in y = 2554 cout<<"nAdd in z = "<<z; getch(); Add of y = 6550 } Add in z = 5888
  8. 8. //Demonstration & Address of (Reference) Operator. #include <iostream.h> * Value At Address (Indirection) operator. #include<conio.h> main () { 10 5888 2554 int x=10; 2554 5888 6550 int *y; **z x *y int **z; cout<<"Value of x = "<<x; cout<<"nAdd of x = "<<&x; Value of x = 10 y=&x; Add of x = 2554 cout<<“Accessing x via ptr y = ”<<*y; z=&y; x via prt y = 10 cout<<“Accessing x via ptr z ”<<**z; x via prt z = 10 getch(); }
  9. 9. & Address of (Reference) Operator. * Value At Address (Indirection) operator. 1. *& variable = variable 2. *(&)variable = *&variable Example 1 : int x =10; cout<<*&x; 10 cout<<*(&)x; Example 2 : int x = 10; int * p; p = &x; cout<<* p; 10

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