What is a pointer in C?

A pointer is a variable that refers to the address of a value. It makes the code optimized and makes the performance fast. Whenever a variable is declared inside a program, then the system allocates some memory to a variable. The memory contains some address number. The variables that hold this address number is known as the pointer variable.

For example:

Data_type *p;

The above syntax tells that p is a pointer variable that holds the address number of a given data type value.

Example of pointer

#include <stdio.h>
int main()
{
int *p; //pointer of type integer.
int a=5;
p=&a;
printf(“Address value of ‘a’ variable is %u”,p);
return 0;
}

Output:

Address value of 'a' variable is 428781252

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