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#include <iostream>
#include <iomanip>

using namespace std;

float subtotal (float[], int);

int main() {
   int arraySize;

   cout << "Enter array size: ";
   cin >> arraySize;

   float array[arraySize];

   cout << "Enter an array size of " << arraySize << " : ";
   for (int i=0; i<arraySize; i++){
       cin >> array[i];
   }

   for (int i=0; i<arraySize; i++){
       array [i] = subtotal (array[i], arraySize);
       cout <<left<<setw(5)<< array [i];
   }

    return 0;
}

float subtotal (float array, int arraySize){
    float x = array+5;
    return x;
}

main.cpp: In function 'int main()':
main.cpp:30:49: error: cannot convert 'float' to 'float*' for argument '1' to 'float subtotal(float*, int)'
        array [i] = subtotal (array[i], arraySize);
                                                 ^