W7Code » C Language » Pointers in C Programming Language

In c the variables take up space a in memory, namely in RAM memory. We can say that ram memory is a huge vector of bytes where all variables are stored. Each variable is stored in a specific memory address. Where the positions inidices vary between 0 and the total bytes of the Ram memory. Pointers in c allow us manipulate directly space in memory. When we declare a variable in c, we are saying to the compiler to save a certain space in memory to store the content of that variable.

Declare Pointers in C

Syntax:

Syntax Explained

  • variable_type, we already have learn;
    • float, int, char, double.
  • *  indicates that it is a pointer-type variable;
  • variable_name, is the name of the pointer that follow the variable name declarations.

 

This is an example of how to declare a pointer in c:

 

 

We have being using pointers since the beginning. When we call the function scanf and use & to store the content of the variable. We are saying to the compiler to save the variable content in the address of that variable.

 

Example:

When we use this we are passing by reference the address of variable pointer.

 

How to Assign an Address to a Pointer?

Use pointers in c is a very delicate process. In c it is possible to assign an address to a pointer bellow:

  • We declare a variable number of type integer, and a pointer named pointer of type int;
  • Then we are assigning the address to pointer  variable using &.
    • get the address of variable number using, &number.

 

If we do not want our pointer to return no value we assign it the NULL constant.

 

Pointer of a Pointer

And if we want know the address of a pointer?

  • This is a tricky, but simple process.  Works the same way when we declare a pointer:

Do you have any doubt about pointer? Please comment bellow!

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