Final

/**
 * Program:			KK_FreightTrain.java
 * Author:			K. Kowalsky
 * Date:			Dec 6, 2012
 * Description:		Ask for user input for number of trains, create an array with that many variables
 * Randomize weight on trains in array
 * Send array to method printTrainArray to print the array to screen
 * Send array to method testWeightDistribution to test if any two trains exceed weight distribution
 * Send array to method getTotalWeight to calculate the final weight, send the final weight back to main method for printing to screen
 */

// Import the Scanner class for obtaining user input
import java.util.Scanner;

public class KK_FreightTrain
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);

		//Ask for user input for number of trains, create an array with that many variables
		System.out.println("Freight Train Load Tester \n\n" +
							"This program will analyze the weight distribution of rail cars in a\nsimulated train to determine if it will meet a bridge capacity requirement." +
							"\n\nHow many cars are on the train?");
		int trainNum = input.nextInt();
		while (trainNum < 10 || trainNum > 30)
		{
			System.out.println("That is an invalid number. How many cars would you like on the train?");
			trainNum = input.nextInt();
		}

		double[] weightArray = new double[trainNum + 1];
		weightArray[0] = 70;

		//Randomize weight on trains in array

		for (int i = 1; i < weightArray.length; i++)
		{
			int randomInt = (int)((130-30+1) * Math.random() + 30);
			weightArray[i] = randomInt;
		}

		//Send array to method printTrainArray to print the array to screen
		printTrainArray(weightArray);
		System.out.println("\n");
		//Send array to method testWeightDistribution to test if any two trains exceed weight distribution
		testWeightDistribution(weightArray);

		//Send array to method getTotalWeight to calculate the final weight, send the final weight back to main method for printing to screen
		double finalWeight = getTotalWeight(weightArray, 0);

		System.out.println("\nThe total weight of this train in metric tons is " + finalWeight + ".");

		input.close();
	}

	static void printTrainArray(double [] a)
	{
		int carNum = 1;
		System.out.println("Here are the weights in metric tons of all parts of the simulated train:\n");
		for(int i = 0; i < a.length; i++)
		{
			if (i == 0)
			{
				System.out.println("Engine: " + a[i]);
			}
			else if (i > 0)
			{
				System.out.println("Car " + carNum + ": " + a[i]);
				carNum ++;
			}
		}
	}
	static void testWeightDistribution(double [] b)
	{
		int errors = 0;
		for (int j = 0; j < b.length - 1; j++)
		{

				if ((b[j] + b[j+1]) > 200)
				{

					if (j == 0)
					{
					System.out.println("\nWARNING: The engine and car 1 exceed the two car weight limit.");
					errors ++;
					}
					else
					{
						System.out.println("WARNING: Car " + j + " and car " + (j+1) + " exceed the two car weight limit.");
						errors ++;
					}

				}
		}
		if (errors == 0)
					{
						System.out.println("No weight distribution problems found for this train.");
					}

	}
	static double getTotalWeight(double [] c, double totalWeight)
	{
		for (int i = 0; i < c.length; i++)
		{
			totalWeight = totalWeight + c[i];
		}
		return totalWeight;
	}
}