What is Pointer ? : Understanding Pointer in C Programming

Understanding pointers in c ?

1. Pointer is a variable which stores the address of another variable
2. Since it is a variable , the pointer itself will be stored at different memory location.

In C Programming we have 2 types of variables -

• Simple Variable that stores a value
• Complex Variable that stores address of simple variable

Simple Example 1 :

#include<stdio.h>

int main()
{
int a = 3;
int *ptr;
ptr = &a;

return(0);
}

Explanation of Example : Consider Variable ‘a’ –

• Name of Variable – a
• Type of Value that it holds – Integer
• Value Stored in a – 3
• Address of Variable – 2001 (Assumption)

Explanation of Example : Consider Variable ptr –

• Name of Variable – ptr
• Type of Value that it holds – Address of any Integer
• Value Stored in a – 2001
• Address of Variable – 4001 (Assumption)

Simple Example 2 :

#include<stdio.h>

int main()
{
int a = 3;
int *ptr,**pptr;
ptr = &a;
pptr = &ptr;
return(0);
}

Explanation of Example : Consider Variable ‘a’ –

• Name of Variable – a
• Type of Value that it holds – Integer
• Value Stored in a – 3
• Address of Variable – 2001 (Assumption)

Consider Variable ptr –

• Name of Variable – ptr
• Type of Value that it holds – Address of any Integer
• Value Stored in a – 2001
• Address of Variable – 4001 (Assumption)

Consider Variable pptr –

• Name of Variable – pptr
• Type of Value that it holds – Address of any Pointer Vaiable
• Value Stored in a – 4001
• Address of Variable – 6001 (Assumption)

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