Question

How can I make sure (test) a reverse program that returns the same array with the same values as you entered before, but just in reverse order?

Example of the program im talking about:

void reverseArray(int arr[], int start, int end)

{

    int temp;

    while (start < end)

    {

        temp = arr[start];   

        arr[start] = arr[end];

        arr[end] = temp;

        start++;

        end--;

    }   

}  

Answer 1

Explanation:

How the function reverseArray works :

Note: Here start and end are not elements they are indexes

Code for testing function :

#include<iostream>
using namespace std;
// function for reverxing the array
// taking argumrnts array,startindex, end index
int revArray(int arr[] , int start,int end){
   int temp ;
   // loop for swaping first element and last element until
   // start < end
   // it results the sorted array
   while (start < end){
       temp = arr[start];
       arr[start] = arr[end];
       arr[end] = temp;
       // after swaping increment start value and decrement end value
       end--;
       start++;
    }
}
int main(){
   // initialising array
   int arr[20],size,i;
   // asking size of the array
   cout << "Enter size of the array: " ;
   // storing length in size
   cin >> size;
   // asking user to enter elements in the array
   cout << "\nEnter elements of the array: ";
   for(i=0 ; i<size ; i++){
       cin >> arr[i];
   }
   // printing array
   cout << "Original Array is : " ;
   for (i=0 ; i<size ; i++ ){
       cout << arr[i] << " " ;
   }
  
   // calling the function revArray
   // by passing array and initial index 0 and the end index
   // which is equal to the size-1
   revArray(arr,0,size-1);
   // printing the same array but this time it prints in reversed order
   // beacuse we called the functioin revArray() so elements are reversed and prints here
   cout << "\nReversed Array is : " ;
   for (i=0 ; i<size ; i++ ){
       cout << arr[i] << " " ;
   }
}

Attachments:

Output:

Any queries comment, please

Thank you :)