Introduction to Pointers

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Copyright © 2002 Pearson Education, Inc. Slide 1.

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Presentation transcript:

Introduction to Pointers

pointer operator available in C is ‘ pointer operator available in C is ‘*’, called ‘value at address’ operator. It gives the value stored at a particular address. The ‘value at address’ operator is also called ‘indirection’ operator.

Note that printing the value of Note that printing the value of *( &i ) is same as printing the value of i. The expression &i gives the address of the variable i. This address can be collected in a variable, by saying, j = &i ;

But remember that j is not an ordinary variable like any other integer variable. It is a variable that contains the address of other variable (i in this case). Since j is a variable the compiler must provide it space in the memory. Once again, the following memory map would illustrate the contents of i and j.

But,we can’t use j in a program without declaring it But,we can’t use j in a program without declaring it. And since j is a variable that contains the address of i, it is declared as, int *j ; This declaration tells the compiler that j will be used to store the address of an integer value. In other words j points to an integer

Address of i = 65524 Address of j = 65522 Value of j = 65524 Value of i = 3 Value of i = 3 Value of i = 3