Write a program to reverse the elements of an array.

An array type is a data type that is meant to describe a collection of elements (values or variables), each selected by one or more indices (identifying keys) that can be computed at run time by the program. Such a collection is usually called an array variable, array value, or simply array. By analogy with the mathematical concepts of vector and matrix, array types with one and two indices are often called vector type and matrix type, respectively.

In order to effectively implement variables of such types as array structures (with indexing done by pointer arithmetic), many languages restrict the indices to integer data types (or other types that can be interpreted as integers, such as bytes and enumerated types), and require that all elements have the same data type and storage size. Most of those languages also restrict each index to a finite interval of integers, that remains fixed throughout the lifetime of the array variable. In some compiled languages, in fact, the index ranges may have to be known at compile time.

Information source: wikipedia.org

Program:->

Output

#include <iostream.h>
using namespace std;
int main() {
   int arr[30], i, j, num, temp;

   cout<<"Enter no. of elements : ";
   cin>>num;
   cout<<"Enter "<<num<<" values : ";
   for (i = 0; i < num; i++) {
      cin>>arr[i];
   }
   j = num - 1;
   i = 0;  
   while (i < j) {
      temp = arr[i];
      arr[i] = arr[j];
      arr[j] = temp;
      i++;
      j--;
   }
   cout<<"\nResult after reversal : ";
   for (i = 0; i < num; i++) {
      cout<<arr[i]<<"   ";
   }
   return (0);
}