Reading Data from a file with a selection option

[Gmoney2015]

earlier last week I posted a question about file reading. I really didn't get the responds I was looking for. So after reading a bunch of info on for loops and while loops, I finally understand how to use them. below is my example of code, I hope it helps someone as someone has heledp me. I'm sure it can be tweaked but its a start. good luck!

ifstream inputfile;
	int number;
	string names;
	int min_num;
	int max_num;

	

	// open file
	

	cout << " This program displays a list of names from a txt.file" << endl;  // greeting 
	cout << " " << endl;
	

	inputfile.open ("lineUp.txt");


	// get the filename from user 
		cout << " enter the start number: number has to start with the number one" << endl;
		cin >>  min_num;
		cout << " enter the end number: any number from 1 - 35 " << endl;
		cin >> max_num;

		// validation
			

			if (inputfile.is_open())
				{
				cout << "File opened\n" << endl;
				}
			else
				{
				cout << ("File Failed to open") << endl;
				return 0;
				}

			// opens and displays nmaes
				
				
				
			
				while (inputfile >> names)
					{
				

			

							for(number = min_num; number <= max_num; number++)
							{
								if (number >= 36  ){
								cout << " Error: 1 - 35 only, try again" << endl;
								return 0;}
								if (number < 0 ){
								cout << " Error: 1 - 35 only:  try again" << endl;
								return 0;}

								inputfile >> names;
								
								inputfile;
								cout << number  << "\t" << (names) << endl;
						
							}

						break;
					}
    
    // Close the output file
    inputfile.close();
	return 0;

}

[Gmoney2015]

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

string maxRain (double arr[], string months[], int n);
string minRain (double arr[], string months[], int n);
double totRain(double arr[],int n);
double avgRain(double arr[],int n);
string showList (double arr[], string months[], int n);
void sortRain (double arr[], string months[], int n);

int main ()
{
    double totRainfall=0.0;
    double avgRainfall=0.0;
    string minRainfallMonth;
    string maxRainfallMonth;
	string listofmonths;
   

    const int n=12;
    string months[n]={"January","February","March","April","May","June","July","August","September","October","November","December"};
    double totals[n];

    for (int i=0;i<n; i++)
    {
       
        cout << "Enter rainfall for " << months[i]  << ": ";
        cin >> totals[i];

        if (totals[i] <0 )
        {
            cout << "invalid data (negative rainfall) -- retry";
            cout << "Enter rainfall for " << months[i] << ": ";
            cin >> totals[i];
        }


    }
	
		totRainfall = totRain(totals, n);
        maxRainfallMonth= maxRain(totals, months, n);
        minRainfallMonth= minRain(totals, months, n);
        avgRainfall = avgRain(totals, n);
	
		//cout << " " << endl;
    	cout << "Total rainfall: " << totRainfall;
    	cout << "\nAverage rainfall: " << avgRainfall;
    	cout << "\nLeast rainfall in: " << minRainfallMonth;
    	cout << "\nMost rainfall in: " <<maxRainfallMonth;
		cout << " " << endl;
		
		sortRain (totals, months, n);
		listofmonths =showList(totals, months, n);
		
	
   
    //cout << "\n\n";
    //system("pause");
}

double avgRain(double arr[],int n)
{
    double tot=0.0;
    for (int i=0; i<n; i++)
        tot+=arr[i];

    return tot/n;
}

double totRain(double arr[],int n)
{
    double tot=0.0;
    for (int i=0; i<n; i++)
        tot+=arr[i];

    return tot;
}


string maxRain(double arr[], string months[], int n)
{
    double max=arr[0];
    int idx=0;
    for (int i=0; i<n; i++)
        if (arr[i]>max)
        {
                max=arr[i];
                idx=i;
        }

    return months[idx];
}


string minRain(double arr[], string months[], int n)
{
    double min=arr[0];
    int idx=0;
    for (int i=0; i<n; i++)
        if (arr[i]<min)
        {
                min=arr[i];
                idx=i;
        }

    return months[idx];
}
void sortRain(double arr[], string month[], int SIZE)
{
   int i;
   int j;

   int min;

for (i = 0; i < SIZE - 1; i++)
{
    min = i; // The intial subscript or the first element.

    for (j = i + 1; j < SIZE; j++)
    {
        if (arr[j] > arr[min])  /* if this element is greater,
                                     then it is the new minimum */
        {
            min = j;
        }
    }   

    // swap both variables at the same times
    double tempDouble = arr[i];
    arr[i] = arr[min];
	arr[min] = tempDouble;

    string tempString = month[i];
    month[i] = month[min];
    month[min] = tempString;
}
 

//for(i=0; i<=11; i++)
// {
//    /* Display the amount of rainfall per month from highest to
//       lowest */
//
//	 cout << "\n" << month[i] << "\t" << arr[i] << endl;
// }
}

string showList (double arr[], string months[], int n)
{
	double max=arr[0];
    int idx=0;
	int count = 0;
	//cout<< "\n";
	for (int count = 0; count < n; count++)
	{
		cout<< arr[count] << " inches " << "in "<< months[count];
		cout << endl;

	}
	
	return months[idx];
}