#include <iostream>
#include <iomanip>
#include <cmath>
 
using namespace std;
 
int main()
{
 
		double totalRain = 0.0;// total rainfall inches
		double count = 0.0;
		int numData;
		char answer;
 
		cout <<"For how many years have you collected rainfall data? ";
		cin >> numData;
			if (numData < 1)
			{	
				cout <<"Invalid:  number of years must be at least one." << endl;
				cout <<"Do you want to try again (y/n)?";
				cin >> answer;
					{
						if (answer == 'Y' || answer == 'y')
						cout <<"For how many years have you collected rainfall data? ";
						cin >> numData;
						if (answer != 'Y' || answer != 'y')
						 cout <<"Goodbye";
					}
			}
 
for(int month = 0; month < numData*12; month++) 
 
{     
		float inches;
		cout << "Enter rainfall (in inches) for month " << (month%12) + 1 << " of year "
		 << (month/12) + 1  << ": ";   
		cin >> inches;
 
		count++;
		totalRain += inches;
 
 
}
cout <<"The total number of months of rainfall data:" << numData * 12 << endl;
cout <<"The total inches of rainfall for that period:" << totalRain << endl;
cout <<"The average rainfall per month for that period:" << totalRain / (float)count << endl;
 
 
system("pause");
return 0;
}

if(choice=='Y') {
     // do something
}
else {
     return EXIT_FAILURE;
}

#include <iostream.h>
int nb_of_year;
int i,j,n;
double r_inches;//rainfall inches
int totalm=0;//total months
double total_i;//total inches
double averagei;
 
 
int main()
{
cout << "enter the number of years u wanna do the calculations for :\n";
cin >> n;
 
	for (i=1;i<=n;i++)
	{
		for (j=1;j<=12;j++)
		{
			cout << "Enter the rainfall (in inches) for month "<< j << " of year ";
			cout << i << ":\n";
			cin >> r_inches;
 
				total_i+=r_inches;
 
				totalm+=1;
 
		}
 
	}
 
 
	cout << "The total number of months of rainfall data :" << totalm << endl;
	cout << "The total inches of rainfall for that period:" << total_i << endl;
	averagei=total_i/totalm;
 
	cout << "The average rainfall per month for that period is:" << averagei <<endl;
 
 
 
return 0;
}