Using functions as parameters with arrays??

[andyman105070]

So I have written my code, the first part is fine utilizing a basic algorithm to find the max volume of an open box based off of user input, so please ignore that part, and I have written the second part of this menu driven program, to be able to pull a file from my project (visual studio) which has 12 piece of rainfall data, I have been able to find the lowest rain fall, the highest, and the average, but I need to be able to put this information OVER the top of the data that is displayed. How would I go about doing this. My book says to use functions as parameters and so forth but im working in circles. As you can see in my switch/choice statement, ive included some nonfunctional functions(lol) to try and place that information ABOVE the external data file. (Case number two) Also how would I be able to put the word smallest and largest next to the data.
this is what I have. Thanks you guys!!!

 #include <iostream>
#include <string>
#include <iomanip> // for set precision
#include <fstream>
using namespace std;
void center(string display);      // Functions
void showMenu();
void openBox();
void rainfall();
double sumOfRain(double []);
double averageOfRain(double []);
double highestMonth(double [], int &);
double lowestMonth(double [], int &);
ifstream input;


int main()

{
	char choice;

	//Constants for the menu choice
	cout << fixed << showpoint << setprecision (2);     //Set decimal point to two figures (1/100th)

	do
	{
		//Display the menu and get the user's choice.
		showMenu();

		while (! (cin >> choice) || !(choice == '1' || choice == '2' || choice == '3')) // Validate the menu selection.
			//Loop , and the the user input of what choice to do
		{
			center( "Are you drunk?? thats invalid order.");
			cout<< endl;
			cin.clear();
			fflush(stdin); // Clear Input buffer.
			center ("Re-Enter your choice : ");


		}

		switch (choice)                             //Switch menu choices
		{
		case '1':
			cout<< endl;
			cout << "\n\nAlright Man, lets create an open box ";
			cout<< "based off of a rectangle : ";

			openBox(); // Calling the box function
			break;

		case '2':
			cout << endl;
			center("Rainfall Statistics : ");
		
			int i = 0;
	double rainfall[12], total, lowest, average;
	
	string months[12] = {"January","Febuary","March","April","May","June","July","August","September","October","November","December"};
	string filename;
	
	
		i = 0;
		cout<<"Enter file name: ";
		getline(cin,filename);
		ifstream input;
		input.open(filename);
		if(!input)
		{
			cout<<"ERROR: File does not exists"<<endl;
		}
		else
		{
			
				while(i<12 && input>>rainfall[i])
				i++;
				input.close();
				total = getTotal(rainfall, 12);
				lowest = getLowest(rainfall, 12);
				average = total/ (12);
				cout << average;
				for(i=0; i<12; i++)
				{
				 cout<<left<<setw(10)<<months[i]<<setprecision(2)<<fixed<<setw(5)<<rainfall[i]<<endl;
				}
				
		}
					

			break;

		case '3':
			center ("Programmer: Andrew Holder");
			cout << endl;
			center ("BYE BYE!!! Press <Enter> key to END the program...");

			fflush(stdin);
			cin.get();
			break; 
		}

		system("CLS"); //Clears screen and then reloops for the entire program
	}
	while (choice!= '3'); // THis is part of the do while loop that keeps continuing until you pick end program.


	cout << endl << endl;

	fflush(stdin);

	return 0;

} 




void showMenu()  // Menu function
{
	cout << endl;
	center("Project Number5");
	cout<< endl  ;
	center("=~=~=~=~=~=~=~=~=~=");
	cout<<endl << endl;
	center("1	Open Box            ");
	cout<<endl;
	center("2	Rainfall Statisitics");
	cout<<endl;
	center("3	End program.        ");
	cout << endl <<endl;
	center("Enter Your Choice: ");


}

void openBox() //Function for calculating most amount of volume by cutting box.
{ 
	double length, width;
	double volumeMax = 0, volumeTemp, cut, height =0;
	cout << "\n\nPlease enter your length of Rectangle: ";
	while ( !(cin >> length) || length <= 0  ) // User input of length rectangle (cannot be equal to
		// or less than 0.
	{
		cout << "Error!\n";
		cin.clear();
		fflush(stdin);
		cout << "Enter again:\n";
	}
	cout << "\nPlease Enter the Width of your Rectangle: "; // User input of Width
	while ( !(cin >> width) || width <= 0 )
	{
		cout << "Error!";
		cin.clear();
		fflush(stdin);
		cout << "Enter again:";
	}



	for(cut = 0.0; cut <= (width / 2) ; cut += 0.005)
	{
		volumeTemp = (length - (2 * cut)) * (width - (2*cut)) * (cut);

		if(volumeTemp > volumeMax)
		{
			volumeMax = volumeTemp;

			height = cut;
		}

	}
	cout << "Here are your box's properties";
	cout << "\nYour Box's Length: " << length;
	cout << "\nYour Box's Width: " << width;
	cout << "\nThe size of your Cut: " << height;
	cout << "\nBox's Max Volume: " << volumeMax;


	fflush(stdin);
	cin.get();
	
}
void rainfall()
{ 
	fflush(stdin);
	double avg = 0;
	double sum = 0;
	int i = 0;
	double rainfall[12];
	
	string months[12] = {"January","Febuary","March","April","May","June","July","August","September","October","November","December"};
	string filename;
	
		avg = 0;
		sum = 0;
		i = 0;
		cout<<"Enter file name: ";
		getline(cin,filename);
		ifstream input;
		input.open(filename);
		if(!input)
		{
			cout<<"ERROR: File does not exists"<<endl;
		}
		else
		{
			cout<<"MONTH	RAINFALL"<<endl;
				while(input>>rainfall[i])
					 cout<<left<<setw(10)<<months[i]<<setprecision(2)<<fixed<<setw(5)<<rainfall[i]<<endl;
				
					
					sum = sum + rainfall[i];
					i++;
				
			input.close();
			
			//calculate average	
			avg = sum / 12;
	
			//calculate highest and lowest rainfall
			 double highest, lowest;			
			 highest=rainfall[0];
			 lowest=rainfall[0];
			 for(i=1;i<12;i++)
			 {
				 if(highest<rainfall[i])
					 highest=rainfall[i];
				
				 if(lowest>rainfall[i])
					 lowest=rainfall[i];
				
				
			 }
			 cout<<endl<<endl;
			 //display result
			 cout<<"Total Rainfall : "<<sum<<endl;
			 cout<<"Average Rainfall : "<<avg<<endl;
			 cout<<"Highest Rainfall: "<<highest<<endl;
			 cout<<"Lowest Rainfall: "<<lowest<<endl;
		}
		 
		 cout<<endl<<"Press enter key to continue<Enter> ";
		 cin.get();
		
		
	}
double getTotal (const double array[], double size)
{
	double total = 0; //Accumulator
	for (int i =0; i < size; i++)
		total += array[i];
	return total;
}
double getLowest (const double array[], double size)
{
	double lowest;
	lowest = array[0];
	for (int i = 0; i< size, i++)
	{
		if(array[i]< lowest)
			lowest = array[i];
	}
	return lowest;
}
		 
	
		

	


void center(string display) // Formula for setting text center
{
	int number = ((80 - display.length()))/ 2;
	for (int i=1; i<=number; i++) //for loop to establish center text
		cout << " ";
	cout << display;
}