Basic C Programming: for Beginners by Janglu Kumar

Author:Janglu, Kumar [Janglu, Kumar]
Language: eng
Format: epub
Published: 2019-10-04T16:00:00+00:00

Using pointers

Now that you know how to declare and initialize pointers, you’re probably wondering how to use them. The indirection operator (*) comes into play again. When the * proceeds the name of a pointer, it refers to the variable pointed to.

Let’s continue with the previous example, in which the pointer p_rate has been initialized to point to the variable rate. If you write *p_rate, it refers to the variable rate. If you want to print the value of rate you could write.

Printf(“%d”, rate);

Or this

Printf(“%d”, *p_rate);

In C, these two statements are equivalent. Accessing the contents of a variable by using the variable name is called Direct access. Accessing the contents of a variable using a pointer to the variable is called indirect access or indirection.

If you have a pointer named ptr that has been initialized to point to the variable var, the following are true:

*ptr and var both refer to the contents of var (that is, whatever values the program has stored there).

Ptr and &var refer to the address of var.

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