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How do I print a reverse array using pointer?

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How do I print a reverse array using pointer?

Logic to reverse array using pointers

  1. Input size and array elements, store it in some variable say size and arr .
  2. Initialize a pointer to first element of array say * left = arr .
  3. Initialize another pointer to last element of array say * right = (arr + size – 1) .

How do you reverse an array pointer?

Approach : In reverse function we take two pointers one pointing at the beginning of the array, other pointing at end of the array. The contents of the memory location pointed by these two pointers are swapped and then the value of first pointer is increased and that of second pointer is decreased .

How do you print an array backwards in C++?

Algorithm to reverse an array

  1. First of all take number of elements as input from user. Let it be N.
  2. Then ask user to enter N numbers and store it in an array(lets call it inputArray).
  3. Declare another array of size equal to input array.
  4. Using a for loop, copy elements from inputArray to reverseArray in reverse order.

What is Pointers in C?

The pointer in C language is a variable which stores the address of another variable. This variable can be of type int, char, array, function, or any other pointer. int* p = &n // Variable p of type pointer is pointing to the address of the variable n of type integer.

How do you print a reverse array?

JAVA

  1. public class ReverseArray {
  2. public static void main(String[] args) {
  3. //Initialize array.
  4. int [] arr = new int [] {1, 2, 3, 4, 5};
  5. System.out.println(“Original array: “);
  6. for (int i = 0; i < arr.length; i++) {
  7. System.out.print(arr[i] + ” “);
  8. }

How do you reverse a set of numbers in C?

Let’s see a simple c example to reverse a given number.

  1. #include
  2. int main()
  3. {
  4. int n, reverse=0, rem;
  5. printf(“Enter a number: “);
  6. scanf(“%d”, &n);
  7. while(n!=0)
  8. {

How do you reverse print in C++?

C++ Program to reverse number

  1. #include
  2. using namespace std;
  3. int main()
  4. {
  5. int n, reverse=0, rem;
  6. cout<<“Enter a number: “;
  7. cin>>n;
  8. while(n!=0)

How do you print a pointer?

Printing pointers. You can print a pointer value using printf with the %p format specifier. To do so, you should convert the pointer to type void * first using a cast (see below for void * pointers), although on machines that don’t have different representations for different pointer types, this may not be necessary.

How to reverse an array using pointers in C?

Initialize another pointer to last element of array say * right = (arr + size – 1). To reverse array I am using two pointers one from left side of array and other from right side. We will swap each successive elements from left to right till center element.

How do you print an array in reverse order?

We iterate through the for loop and for each iteration we print the value present at the address ptr. And for each iteration we decrement the value of ptr by 1. This prints the array elements in reverse order. 1. Array elements are always stored in contiguous memory location. 2.

How to write a C program to read an array?

Write a C program using pointers to read in an array of integers and print its elements in reverse order. We have declared one pointer variable and one array. Address of first element of array is stored inside pointer variable. Accept Size of an Array. Now we have accepted element one by one using for loop and scanf statement .

How to use a pointer in an array?

Pointer and array memory representation If you have a pointer say ptr pointing at arr. Then you can easily apply pointer arithmetic to get reference of next array element. You can either use (ptr + 1) or ptr++ to point to arr.