Write a C Program to Reverse array using Pointers

What are Pointers?

A pointer is a variable whose value is the address of another variable, i.e., direct address of the memory location. Like any variable or constant, you must declare a pointer before using it to store any variable address.

The general form of a pointer variable declaration is −

• type *var-name;

Here, type is the pointer’s base type; it must be a valid C data type and var-name is the name of the pointer variable.

The asterisk * used to declare a pointer is the same asterisk used for multiplication. However, in this statement the asterisk is being used to designate a variable as a pointer.

The unary or monadic operator & gives the “address of a variable’”.

The indirection or dereference operator * gives the “contents of an object pointed to by a pointer”.

Below is the source code for C Program to Reverse array using Pointers which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

/*  C  Program to Reverse array using Pointers  */

#include<stdio.h>
#include<conio.h>
#define MAX 30

int main()
{
   int size, i, arr[MAX];
   int *ptr;

   ptr = &arr[0];

   printf("Enter the size of array :: ");
   scanf("%d", &size);

   printf("\nEnter %d integers into array:\n ", size);
   for (i = 0; i < size; i++)
  {
      printf("\nEnter %d integer into array: ", i+1);
      scanf("%d", ptr);
      ptr++;
   }

   ptr = &arr[size - 1];

   printf("\nElements of array in reverse order are :\n");

   for (i = size - 1; i >= 0; i--) {
      printf("\n\nElement %d is %d  ", i+1, *ptr);
      ptr--;
   }

 return 0;
}

Output : :

/*  C  Program to Reverse array using Pointers  */

Enter the size of array :: 5

Enter 5 integers into array:

Enter 1 integer into array: 6

Enter 2 integer into array: 7

Enter 3 integer into array: 8

Enter 4 integer into array: 9

Enter 5 integer into array: 0

Elements of array in reverse order are :


Element 5 is 0

Element 4 is 9

Element 3 is 8

Element 2 is 7

Element 1 is 6

Process returned 0

Above is the source code for C Program to Reverse array using Pointers which is successfully compiled and run on Windows System.The Output of the program is shown above .