Question

In c++, build a program that does simple calculation function(s) such as summing, averaging, etc. using separately complied files for the implementation and interface. Points will be rewarded based on the separate files working tongether successfully.

Answer 1

Given below is the code for the question.
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MyFunctions.h
----

#ifndef MyFunctions_h
#define MyFunctions_h

int sum(int arr[], int n);
int max(int arr[], int n);
int min(int arr[], int n);
double avg(int arr[], int n);

#endif /* MyFunctions_h */

MyFunctions.cpp
---------------

#include "MyFunctions.h"
int sum(int arr[], int n){
   int s = 0;
   for(int i = 0;i < n; i++)
       s += arr[i];
   return s;
}

int max(int arr[], int n){
   int largest = arr[0];
   for(int i = 1; i < n; i++){
       if(arr[i] > largest)
           largest = arr[i];
   }
   return largest;
}

int min(int arr[], int n){
   int smallest = arr[0];
   for(int i = 1; i < n; i++){
       if(arr[i] < smallest)
           smallest = arr[i];
   }
   return smallest;
}

double avg(int arr[], int n){
   return ((double)sum(arr, n)) / n;
}

main.cpp
-----
#include <iostream>
#include "MyFunctions.h"
using namespace std;

int main(){
   int arr[20];
   int n;
  
   cout << "How many number do you want to enter? ";
   cin >> n;
   cout << "Enter the numbers separated by space: ";
   for(int i = 0; i < n; i++)
       cin >> arr[i];
  
   cout << "Sum: " << sum(arr, n) << endl;
   cout << "Max: " << max(arr, n) << endl;
   cout << "Min: " << min(arr, n) << endl;
   cout << "Avg: " << avg(arr, n) << endl;
  
   return 0;
}

output
---
How many number do you want to enter? 5
Enter the numbers separated by space: 4 2 8 1 6
Sum: 21
Max: 8
Min: 1
Avg: 4.2