Initialization of Pointers in C programming.

Initialize a Pointer Variable In this tutorial section let learn how to declare and initialize value to pointer variable? When the pointer is declared initially it contains garbage value. Garbage value means the pointer could point anywhere in the memory. We need to assign the value to the pointer. Value assigned to pointer is an address of a variable.

Assign, initialize pointer-variable in C programming language.

“The process of assigning the address of a variable to a pointer is known as pointer initialization.”

& the address operator is used to find the address of a variable.
The & operator immediately preceding a variable name returns the address of the variable associated with it.
Syntax:
Data type *pointer-variable;
The given above syntax is to declare a pointer variable.
eg.

int var=20;
int *ptr1;
ptr1=&var;
The integer variable var is declared and initialized value 20.
int *ptr1;
*ptr1=&var;
integer pointer *ptr1 has declared .And pointer ptr is assigned the address of var.
Now the pointer *ptr1 pointing to the value of var.The pointed value is 20.

C program to demonstrate declare and initialize pointer

#include<stdio.h>
int main()
{
int var = 20;
int *ptr1; // declare a integer pointer
ptr1 = &y; // assign value to pointer ptr1
printf("The Value at ptr1 variable is: %d \n", *ptr1);
printf("Address pointed by ptr1 is: %p \n", ptr1);
return 0;
}

Value at ptr is: 20
Address pointed by ptr is: 0x7fff99c0e6c4

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