Look Over Code Please!
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Thread: Look Over Code Please!

  1. #1
    Join Date
    Apr 2009
    Posts
    2

    Arrow Look Over Code Please!

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

    Code:
    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.

  2. #2
    dlorde is offline Elite Member Power Poster
    Join Date
    Aug 1999
    Location
    UK
    Posts
    10,163

    Re: Look Over Code Please!

    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
    Please use [CODE]...your code here...[/CODE] tags when posting code. If you get an error, please post the full error message and stack trace, if present.

  3. #3
    Join Date
    Apr 2009
    Posts
    2

    Thumbs up Re: Look Over Code Please!

    Quote Originally Posted by dlorde View Post
    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.

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