Error

[iWrestledAnEmo]

main.cpp: In function 'int main()':
main.cpp:40:20: error: invalid conversion from 'int' to 'int*' [-fpermissive]
revArray = reverse(arr, size);

I get this error when I compile and I am unsure as to what is causing this?

#include <iostream>
#include <new>
using namespace std;
int reverse(int[], int size);
int expand(int *arr, int size, int *revArray);
void shiftright(int *arr, int size);
void calculateMode(int *arr, int size);


int main()
{
	
	int n, size;
	int *arr;
	int *revArray;
	
	cout << "How many numbers would you like to type? ";
	cin >> size;
	if (size <= 0)
    { 
	  cout << "Invalid Input! Please enter a value > 0:" << endl;
	  return 0;
	}
  arr= new (nothrow) int[size];
  revArray= new (nothrow) int[size];
  if (arr == nullptr)
    cout << "Error: memory could not be allocated";
  else
  {
    for (n=0; n<size; n++)
    {
      cout << "Enter number: ";
      cin >> arr[n];
    }
    cout << "You have entered: ";
    for (n=0; n<size; n++)
      cout << arr[n] << ", ";
	cout << "\n";
  }
	revArray = reverse(arr, size);
	cout << "The contents of the reversed array are: ";
	for(int i=0; i<size; i++)
	{
		cout<<revArray[i]<<" ";
	}	
  
  
    delete[] arr;
	return 0;
}

//***********************************************************************
//reverse function
//This function reverses the order of the elements in a array.
//
//Return Value
//----------------
//void
//
//Parameter
//----------------
//int *arr
//int size
//***********************************************************************
int* reverse(const int* arr, int size)
{
    int* revArray = new int[size];
    for (int i = 0; i < size; ++i)
        revArray[i] = arr[size-i-1];
    return revArray;
}
//***********************************************************************
//This function expands the original and reversed array into one array.
//
//Return Value
//----------------
//int
//
//Parameter
//----------------
//int *arr
//int size
//int *revArray
//***********************************************************************
int expand(int *arr, int size, int *revArray)
{
	
}

//***********************************************************************
//This function creates a new array that shifts each element to the right by 1.
//
//Return Value
//---------------
//void
//
//Parameter
//---------------
//int *arr
//int size
//***********************************************************************
void shiftright(int *arr, int size)
{
  
int temp;
int temp1;

for (int i=0; i<(size -1); i++)
{
	temp = 	arr[size-1];
	arr[size-1] = arr[i];
	arr[i] = temp;
}
}

//***********************************************************************
//mode function
//This function find the mode of the array.
//
//Return Value
//----------------
//void
//
//Parameter
//----------------
//int *arr
//int size
//***********************************************************************
void calculateMode(int *arr, int size)
{
    int counter = 1;
    int max = 0;
    int mode = arr[0];
        
		for (int pass = 0; pass < size - 1; pass++)
        {
           if (arr[pass] == arr[pass+1])
           {
              counter++;
              if (counter > max)
              {
                  max = counter;
                  mode = arr[pass];
              }
           } else
              counter = 1; 
        }
    cout << "The mode is: " << mode << endl;
}

[keskiverto]

You call reverse() on line 40 (as the error mentions).

What is this "reverse"?
It must be the function that was declared on line 4:
int reverse(int[], int size);
That function returns an integer, not a pointer.

On lines 65-71 you do have a slightly different reverse():
int* reverse(int[], int size);

You must update the declaration to match the implementation.

[iWrestledAnEmo]

Thank you! I fixed the problem by doing this. Also the "reverse" is reversing the order of the elements in *arr.

#include <iostream>
#include <new>
using namespace std;
int* reverse(int *arr, int size);
int expand(int *arr, int size, int *revArray);
void shiftright(int *arr, int size);
void calculateMode(int *arr, int size);


int main()
{
	
	int n, size;
	int *arr;
	int *revArray;
	
	cout << "How many numbers would you like to type? ";
	cin >> size;
	if (size <= 0)
    { 
	  cout << "Invalid Input! Please enter a value > 0:" << endl;
	  return 0;
	}
  arr= new (nothrow) int[size];
  revArray= new (nothrow) int[size];
  if (arr == nullptr)
    cout << "Error: memory could not be allocated";
  else
  {
    for (n=0; n<size; n++)
    {
      cout << "Enter number: ";
      cin >> arr[n];
    }
    cout << "You have entered: ";
    for (n=0; n<size; n++)
      cout << arr[n] << ", ";
	cout << "\n";
  }
	revArray = reverse(arr, size);
	cout << "The contents of the reversed array are: ";
	for(int i=0; i<size; i++)
	{
		cout<<revArray[i]<<" ";
	}	
  
  
    delete[] arr;
	delete[] revArray;
	return 0;
}

//***********************************************************************
//reverse function
//This function reverses the order of the elements in a array.
//
//Return Value
//----------------
//int
//
//Parameter
//----------------
//int *arr
//int size
//***********************************************************************
int* reverse(int *arr, int size)
{
    int* revArray = new int[size];
    for (int i = 0; i < size; ++i)
        revArray[i] = arr[size-i-1];
    return revArray;
}