Look Over Code Please!

[ksaul]

This is a project for my college java class, Ive already shown the teacher and he even doesnt know what the problem is!

import java.util.*;
import java.text.*;

public class Project2
{
	public static void main (String[] args)
	{
		//
		//Variables
		//

		double dblTotalPrice = 0;
		double dblTotalUsage = 0;
		int intUserBulbs;
		int intUserFans;
		int intUserTVs;	
		int intEnergyEff;	
		int intFanUse;
		int intTVUse;
		double intBulbUse;		
		String strWhen = "o";
		int rndWhen;

		//
		//Scanner/User Input
		//
		Scanner scan = new Scanner (System.in);

		System.out.println("Kevin Saul\nCIS-129-01 Project #2");
		System.out.println("\n");
		
		System.out.println("Number of Light Bulbs:");
		intUserBulbs = scan.nextInt();

		System.out.println("Number of ceiling fans:");
		intUserFans = scan.nextInt();

		System.out.println("Number of TVs:");
		intUserTVs = scan.nextInt();

		System.out.println("Do you use Energy Efficent light Bulbs (or CFLs)?\n 1 for Yes or 2 for No");
		intEnergyEff = scan.nextInt();
		
		//
		//Conversion/Mathwork
		//

		switch (intEnergyEff) {
			case 1: 
				intBulbUse = ((intUserBulbs * 16) / 1000); 
				intFanUse = (intUserFans * 85); //85kwh average monthly per each fan
				intTVUse = (intUserTVs * 40); //19"-32" = 30, 35"+ = 39.4++ kwh average monthly
		
				dblTotalUsage = ((intBulbUse) + (intFanUse) + (intTVUse));
				break;
			case 2: 
				intBulbUse = ((intUserBulbs * 60) / 1000); 
				intFanUse = (intUserFans * 85); //85kwh average monthly per each fan
				intTVUse = (intUserTVs * 40); //19"-32" = 30, 35"+ = 39.4++ kwh average monthly
		
				dblTotalUsage = ((intBulbUse) + (intFanUse) + (intTVUse));
				break;			
			default: 
				System.out.println("You either do or dont use CFLs.\n"); 
				break;
		}

		//
		//Random Generator, Randomly Desides when your using power
		//

		Random generator = new Random();
		rndWhen = generator.nextInt(3) + 1; //random number between 1 & 3 exclusive
		if (rndWhen == 1) {
			dblTotalPrice = (dblTotalUsage * 0.10); //Intermediate Peak is 9.933 cents/kwh
			strWhen = "Intermediate-Peak";
		} if (rndWhen == 2) {
			dblTotalPrice = (dblTotalUsage * 0.15); //On Peak is 15.298 cents/kwh 
			strWhen = "On-Peak";
		} if (rndWhen == 3) {
			dblTotalPrice = (dblTotalUsage * 0.09); //Off-Peak is 8.917cents/kwh
			strWhen = "Off-Peak";
		}
		
		//
		//Show/End
		//

		System.out.println ("\nThis is just an idea of how much power you use each month");
		System.out.println ("If you used " + dblTotalUsage + " kilowatts each month at " + strWhen);
		System.out.println ("Your Esimated Bill would be: $" + dblTotalPrice);
		
	}
}

I don't get any compiler errors, just when i run the program, it doesnt run
intBulbUse = ((intUserBulbs * 16) / 1000);
it keeps it at 0, which it is originally declared at the beginning of the code. If I remove the 0, it says the variable hasn't been initiated yet..

Thanks in advance for the help! My teacher was even stumped with it.

[dlorde]

If you want to get a floating-point result from a calculation involving integral types (e.g. the calculation that gives zero), you need to cast one of the elements involved to a floating-point type, otherwise the result will be an integer (zero) that is assigned to your floating-point variable (an expression is evaluated according to the types in the expression, not the type it gets assigned to). A simple way to do this is either to give one of the numeric literals a decimal point, making it a floating-point literal, or to put an 'f' or 'F' or 'D' or 'd' after it, making it a float or a double respectively, e.g:

intBulbUse = ((intUserBulbs * 16.0) / 1000);
or
intBulbUse = ((intUserBulbs * 16f) / 1000);

A teacher who doesn't know this isn't really a Java teacher... but there are many things to know and learn, and even a teacher can't know eveything.

The generation of random numbers is too important to be left to chance...
R. Coveyou

[ksaul]

If you want to get a floating-point result from a calculation involving integral types (e.g. the calculation that gives zero), you need to cast one of the elements involved to a floating-point type, otherwise the result will be an integer (zero) that is assigned to your floating-point variable (an expression is evaluated according to the types in the expression, not the type it gets assigned to). A simple way to do this is either to give one of the numeric literals a decimal point, making it a floating-point literal, or to put an 'f' or 'F' or 'D' or 'd' after it, making it a float or a double respectively, e.g:

intBulbUse = ((intUserBulbs * 16.0) / 1000);
or
intBulbUse = ((intUserBulbs * 16f) / 1000);

A teacher who doesn't know this isn't really a Java teacher... but there are many things to know and learn, and even a teacher can't know eveything.

The generation of random numbers is too important to be left to chance...
R. Coveyou

Awesome! I really appreciate the quick response!
And your right, my teacher isn't a java teacher. My college used to teach VB up until this semester and my teacher was required to learn the new material, or find another job.