Thread: Average Rainfall Main Class Using nested for loops,input validation - Average is off

Hello - I follow posts on this forum and this is my first posting, thank you.

When input validation for the first months rainfall is non-negative, this results in correct average rainfall.
When input validation is used for the first months rainfall I'm prompted to input a positive number, which is 2.
When asked to input rainfall, in inches, for each month, I begin with input -3, I am again prompted to re-enter
a positive, I enter 3. What happens is, whichever positive integer I input after I had entered a negative for
the first months rainfall, the average would be off by the positive number inputted.
Thank you for your help and advice.

package averagerainfall;
import java.util.Scanner;
 
public class AverageRainfall 
{
    public static void main(String[] args)
    {
        int maxYears;
        int totalMonths;
        int monthCount = 0;
        double rainInches = 0.0;
        double totalInches = 0.0;          // Initialize total inches or rain
        double averageRainInches = 0.0;    // Initialize total average of rain
 
        Scanner keyboard = new Scanner(System.in);
 
        System.out.println("Enter the number of years: ");
        maxYears = keyboard.nextInt();
 
        while (maxYears < 1)
        {
            System.out.println("Invalid. Enter 1 or greater:");
            maxYears = keyboard.nextInt();
        }
        totalMonths = maxYears * 12;
        System.out.print("Enter the rainfall, in inches, for each month.\n");
 
        for (int yearCount = 1; yearCount <= maxYears; yearCount++)
        {
             for (monthCount = 1; monthCount <= 12; monthCount++)
            {
                System.out.println("Year " + yearCount + " month " + monthCount + ":");
                rainInches = keyboard.nextInt();
 
                while ( rainInches < 0 )
                {
                    System.out.println("Invalid. Enter 0 or greater:");
                    rainInches = keyboard.nextInt();
                    totalInches += rainInches;
                }   
                totalInches += rainInches;
            }
        }
        averageRainInches = (double) totalInches / totalMonths;
 
        System.out.println("Number of months: " + totalMonths);
        System.out.println("Total rainfall: " + totalInches);
        System.out.println("Average monthly rainfall: " + averageRainInches + " inches");
    }
 
}

--- Update ---

Please disregard the first sentence, thank you.

Welcome to the forum! Thanks for taking the time to learn to post code correctly.

Study this and determine how it could contribute to your complaint:

while ( rainInches < 0 )
{
    System.out.println("Invalid. Enter 0 or greater:");
    rainInches = keyboard.nextInt();
    totalInches += rainInches;
}   
totalInches += rainInches;

All I had to do was remove totalInches += rainInches; from the last while statement. Wow thank you! I have spent hours learning to write this code.

You're welcome.