Using the 3rd parameter of a function - c++

Question

Can anyone help me figure out how to get the 3rd parameter of the getLowest/getHighest function to reference the names array that has the months of the year and display the names of the month when I call for it? What's supposed to happen with those functions is that they are supposed to be able to give the name of the month that corresponds with the lowest/highest amount in the array. I can't seem to get it down. That's the last thing I need for this code and I'm trying very hard to figure it out. Any help would be much appreciated. Thank you.
#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
//Function prototypes
double getTotal(double [], int);
double getAverage(double [], int);
double getLowest(double [], int, int&);
double getHighest(double [], int, int&);
int main()
{
const int months = 12;
string names[months] = { "January", "February", "March", "April",
"May", "June", "July", "August",
"September", "October", "November", "December" };
double rainfall[months];
double total, average, maxRain, minRain;
int indexofLowest, indexofHighest;
//Input from using for the rainfall amounts
std::cout << "Please enter the amount of rainfall in inches, that fell in each month.\n";
std::cout << "Enter the amount of rainfall for " << names[0];
std::cin >> rainfall[0];
std::cout << "Enter the amount of rainfall for " << names[1];
std::cin >> rainfall[1];
std::cout << "Enter the amount of rainfall for " << names[2];
std::cin >> rainfall[2];
std::cout << "Enter the amount of rainfall for " << names[3];
std::cin >> rainfall[3];
std::cout << "Enter the amount of rainfall for " << names[4];
std::cin >> rainfall[4];
std::cout << "Enter the amount of rainfall for " << names[5];
std::cin >> rainfall[5];
std::cout << "Enter the amount of rainfall for " << names[6];
std::cin >> rainfall[6];
std::cout << "Enter the amount of rainfall for " << names[7];
std::cin >> rainfall[7];
std::cout << "Enter the amount of rainfall for " << names[8];
std::cin >> rainfall[8];
std::cout << "Enter the amount of rainfall for " << names[9];
std::cin >> rainfall[9];
std::cout << "Enter the amount of rainfall for " << names[10];
std::cin >> rainfall[10];
std::cout << "Enter the amount of rainfall for " << names[11];
std::cin >> rainfall[11];
//Get total
total = getTotal(rainfall, months);
//Get average
average = getAverage(rainfall, months);
//Get the max amount of rain
maxRain = getHighest(rainfall, months, indexofHighest);
//Get the min amount of rain
minRain = getLowest(rainfall, months, indexofLowest);
//Display the total, average, highest/lowest
std::cout << "The total amount of rain for the year is " << total << " inches.\n";
std::cout << "The average amount of rain monthly is " << average << " inches per month.\n";
std::cout << "The month that had the highest amount of rainfall is " << names[indexofHighest] << " with " << maxRain << " inches.\n";
std::cout << "The month that has the lowest amount of rainfall is " << names[indexofLowest] << " with " << minRain << " inches.\n";
return 0;
}
//Definition of function getTotal
double getTotal(double rainfall[], int months)
{
double total = 0;
for (int count = 0; count < months; count++)
{
total += rainfall[count];
}
return total;
}
//Definition of function getAverage
double getAverage(double rainfall[], int months)
{
double total = 0;
double average = 0.0;
for (int count = 0; count < months; count++)
{
total += rainfall[count];
average = total / months;
}
return average;
}
//Defintion of function getLowest
double getLowest(double rainfall[], int months, int indexofLowest)
{
int count;
double lowest;
lowest = rainfall[0];
for (count = 1; count < months; count++)
{
if (rainfall[count] < lowest)
lowest = rainfall[count];
}
return lowest;
}
//Definition of function getHighest
double getHighest(double rainfall[], int months, int indexofHighest)
{
int count;
double highest;
highest = rainfall[0];
for (count = 1; count < months; count++)
{
if (rainfall[0] > highest)
highest = rainfall[count];
}
return highest;
}

Answer 1

I tried your code. You have a few bugs. I guess you need to try harder in the future. Anyways here is a working solution with minimal changes to your existing code -
//Defintion of function getLowest
double getLowest(double rainfall[], int months, int & indexofLowest)
{
int count;
double lowest;
lowest = rainfall[0];
for (count = 1; count < months; count++)
{
if (rainfall[count] < lowest)
{
lowest = rainfall[count];
indexofLowest = count;
}
}
return lowest;
}
//Definition of function getHighest
double getHighest(double rainfall[], int months, int & indexofHighest)
{
int count;
double highest;
highest = rainfall[0];
for (count = 1; count < months; count++)
{
if (rainfall[count] > highest)
{
highest = rainfall[count];
indexofHighest = count;
}
}
return highest;
}

Answer 2

You have to set indexofLowest and indexofHighest in your functions (and match their prototype):
//Defintion of function getLowest
double getLowest(double rainfall[], int months, int& indexofLowest)
int count;
double lowest;
lowest = rainfall[0];
for (count = 1; count < months; count++)
{
if (rainfall[count] < lowest) {
lowest = rainfall[count];
indexofLowest = count;
}
}
return lowest;
}
//Definition of function getHighest
double getHighest(double rainfall[], int months, int& indexofHighest)
{
int count;
double highest;
highest = rainfall[0];
for (count = 1; count < months; count++)
{
if (rainfall[count] > highest) { //there was a bug here in your code: ... rainfall[0]
highest = rainfall[count];
indexofHeighest = count;
}
}
return highest;
}
you can also use a function to input data (and maybe add a little error checking):
//Input from using for the rainfall amounts
int readData(string monthNames[], double rain[], int n) {
int i;
std::cout << "Please enter the amount of rainfall in inches, that fell in each month.\n";
for ( i=0; i<n; i++) {
std::cout << "Enter the amount of rainfall for " << monthNames[i];
std::cin >> rain[i]; //check this value somehow!
}
return i;
}