Question

Write a program in C++ that lets the user enter the total rainfall for each of 12 months into an array of doubles. The program should calculate and display the total rainfall for the year, the average monthly rainfall, and the months with the highest and lowest amounts. Input validation: Do not accept negative numbers for monthly rainfall figures.

Answer 1

#include <iostream>
#include <algorithm>
#include <string>
using namespace std;

double sumArray(double[], int);
double averageArray(double[], int);
double maxArray(double[], int, int &);
double minArray(double[], int, int &);
void sortRainfall(double[], int, string[]);
void printRainfall(double[], int, string[]);

int main()
{
   const int MONTHS = 12;   //MONTHS
   double monthlyRainfall[MONTHS];
   string monthName[MONTHS] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };  
  
   double totalRainfall;
   double averageRainfall;
   double highestRainfall;
   double lowestRainfall;
   int max = 0;
   int low = 0;


   for (int i = 0; i < MONTHS; i++)
   {
       cout << "Enter rainfall in " << monthName[i] << ": ";
       cin >> monthlyRainfall[i];

       while (monthlyRainfall[i] < 0)
       {
           cout << "Rainfall should not be negative." << endl;
           cout << "Reenter the rainfall in " << monthName[i] << ": ";
           cin >> monthlyRainfall[i];
       }
   }

   totalRainfall = sumArray(monthlyRainfall, MONTHS);
   averageRainfall = averageArray(monthlyRainfall, MONTHS);
   highestRainfall = maxArray(monthlyRainfall, MONTHS, max);
   lowestRainfall = minArray(monthlyRainfall, MONTHS, low);


   cout << "Total rainfall: " << totalRainfall << " inches " << endl;
   cout << "Average rainfall: " << averageRainfall << " inches " << endl;
   cout << "Most rainfall in " << monthName[max] << endl;
   cout << "Least rainfall in " << monthName[low] << endl;

   sortRainfall(monthlyRainfall, MONTHS, monthName);
   printRainfall(monthlyRainfall, MONTHS, monthName);

   //system("pause");
   return 0;
}

double sumArray(double totalRainfall[], int n)
{
   double total = 0;
   for (int i = 0; i < n; i++)
       total += totalRainfall[i];

   return total;
}

double averageArray(double totalRainfall[], int n)
{
   double average = 0.0;
   double total = 0;

   for (int i = 0; i < n; i++)
       total += totalRainfall[i];

   average = total / n;

   return average;
}


double maxArray(double totalRainfall[], int n, int &monthIndex)
{
   double high;

   int i = 0;
   high = totalRainfall[i];
   while (i < n)
   {
       if (totalRainfall[i] > high)
       {
           high = totalRainfall[i];
           monthIndex = i;
       }

       i++;
   }

   return high;
}

double minArray(double totalRainfall[], int n, int &monthIndex)
{
   double least;

   int i = 0;
   least = totalRainfall[i];
   while (i < n)
   {
       if (totalRainfall[i] < least)
       {
           least = totalRainfall[i];
           monthIndex = i;
       }

       i++;
   }

   return least;
}


void sortRainfall(double totalRainfall[], int n, string months[])
{
   for (int i = 0; i < n ; i++)
   {
       int minPos = i;  
       double minValue = totalRainfall[i];
       string minMonth = months[i];

       for (int j = i + 1; j < n; j++)
       {
           if (totalRainfall[j] < minValue)  
           {
               minPos = j;
               minValue = totalRainfall[j];
              
               minMonth = months[j];  
           }
       }

       totalRainfall[minPos] = totalRainfall[i];
       totalRainfall[i] = minValue;
       months[minPos] = months[i];
       months[i] = minMonth;
   }
}

void printRainfall(double totalRainfall[], int n, string months[])
{

   for (int i = 0; i < n; i++)
   {
       cout << totalRainfall[i] << " inches in " << months[i] << endl;
   }
   cout << endl;
}