Collin Sampson

Sure Paul.

The Program is Outputting:

Month actual difference january 1 1 february 1 1 march 1 1 april (And so on...) may june july august september october november december

Okay, I see.

It should've been: Array Output (No rush though) ;D

Why is for loop in the display method only printing the first argument (oneArray) correctly? It is only repeating the other arguments...

import java.util.*; public class RainfallProgramDemo { public static final int NUM_MONTHS = 12; public static void main(String[] args) { Scanner keyboard = new Scanner(System.in); System.out.println("What is the current month?"); String currentMonthString; currentMonthString = keyboard.next(); System.out.println("Enter the average rainfall for the previous " + "12 months, starting with last " + currentMonthString); double[] averageRainfall = new double[NUM_MONTHS]; fillArray(averageRainfall); System.out.println("Enter the actual rainfall for the previous " + "12 months, starting with last" + currentMonthString); double[] actualRainfall = new double[NUM_MONTHS]; fillArray(actualRainfall); double[] differenceFromAverage = new double[NUM_MONTHS]; int index; for (index = 0; index < differenceFromAverage.length; index++) { differenceFromAverage[index] = actualRainfall[index] - averageRainfall[index]; } if (currentMonthString.equalsIgnoreCase("january")) { String[] months1 = {"January ", "February ", "March ", "April ", "May ", "June ","July ", "August ", "September " ,"October ", "November ", "December "}; display(months1, actualRainfall, differenceFromAverage); } if (currentMonthString.equalsIgnoreCase("febuary")) { //display(months2); } if (currentMonthString.equalsIgnoreCase("march")) { //display(months3); } if (currentMonthString.equalsIgnoreCase("april")) { //display(months4); } if (currentMonthString.equalsIgnoreCase("may")) { //display(months5); } if (currentMonthString.equalsIgnoreCase("june")) { //display(months6); } if (currentMonthString.equalsIgnoreCase("july")) { //display(months7); } if (currentMonthString.equalsIgnoreCase("august")) { //display(months8); } if (currentMonthString.equalsIgnoreCase("september")) { //display(months9); } if (currentMonthString.equalsIgnoreCase("october")) { //display(months10); } if (currentMonthString.equalsIgnoreCase("november")) { //display(months11); } if (currentMonthString.equalsIgnoreCase("december")) { //display(months12); } } public static void fillArray(double[] anArray) { Scanner keyboard = new Scanner(System.in); int index; double check, check1; check = keyboard.nextDouble( ); if (check >= 0) { anArray[0] = check; } for (index = 1; index < anArray.length; index++) { check1 = keyboard.nextDouble( ); if (check1 >= 0) { anArray[index] = check1; } } } public static void display(String[] oneArray, double[] twoArray, double[] threeArray) { int index; System.out.println("Month" + " " + "Actual" + " " + "Difference From Average"); for (index = 0; index < NUM_MONTHS; index++) { System.out.println(oneArray[index] + " " + twoArray[index] + " " + threeArray[index]); } } }

Okay I put in some test code and checked the highest and lowest values after each loop. It sets 15 to highest and lowest as it should but when I input 1 for the next value, it still has 15 as both the highest and lowest values. It is not executing the if statements within the loop for index = 1. I don't understand...

I have a problem in my beginning java class..

There are seven judges scores on each dive and a difficulty for the dive ranging from 1.2 to 3.8. To determine the final score, the lowest score and highest score are eliminated, then multiplied by the difficulty, then multiplied by .6.

(5 scores) * (difficulty) * .6 = final score

Here's my code, I can't tell why its not working. First time using an array.

import java.util.*; public class DiveScoringProgram { public static void main(String[] args) { int index = 0; double next; double highest, lowest; double input; double difficulty = 0; double sum = 0; double finalScore; double[] scores = new double[7]; System.out.println("Enter the " + scores.length + " judges' scores please."); System.out.println(" "); Scanner keyboard = new Scanner(System.in); scores[0] = keyboard.nextDouble( ); sum = sum + scores[0]; highest = scores[0]; lowest = scores[0]; for (index = 1; index < scores.length; index++) { scores[index] = keyboard.nextDouble( ); if (scores[index] >= 0) { sum = sum + scores[index]; if (scores[index] > highest) { scores[index] = highest; } if (scores[index] < lowest) { scores[index] = lowest; } } else { System.out.println("Error: negative number entered."); System.out.println(" "); } } System.out.println(" "); System.out.println("Enter degree of difficulty please."); difficulty = keyboard.nextDouble( ); System.out.println(" "); if ((difficulty >= 1.2) && (difficulty <= 3.8)) { finalScore = ((sum - highest - lowest) * difficulty * 6.0) / 10.0; System.out.println("Diver's final score is: "); System.out.println(finalScore); } else { System.out.println("Error: degree of difficulty must " + "be between 1.2 and 3.8."); } } }

It is compiling and running, but the calculations are wrong. I ran the scores...
15, 1, 10, 10, 10, 10, 10
And a difficulty... 1.5
Which should be (50) * (1.5) * .6 = final score of 45

Instead it returns... final score of 67.5 =(

So, I have an assignment in beginning java in which 3 guys (Aaron, Bob, Charlie)shoot at each other until 1 is left standing.
Stipulations:
Aaron shoots first and hits with 33% accuracy.
Bob shoots second and hits with 50% accuracy.
Charlie shoots last and hits every time.
Each shooter aims for the best shot (so Aaron and Bob would shoot at Charlie if he was still alive).

We have not yet studied inheritance and I'm a beginner so go easy on me.
Here is what I have. I have not yet included a main method and I've been working at this for too long...please help me out.

import java.util.*;

public class DuelFinal { public static int hitsLeft = 1; public class Duelist { private String name; private double accuracy; private String target; private String shooter; public Duelist(String name, double accuracy) { this.name = name; this.accuracy = accuracy; } public String getName() { return this.name; } public double getAccuracy() { return this.accuracy; } public boolean isStillAlive() { return hitsLeft>0; } public void takeHit() { hitsLeft = hitsLeft - 1; } public boolean ShootAtTarget(Duelist target) { if (shooter.equalsIgnoreCase("aaron") == true) { int x = (int) (Math.random() * 3 + 1); if (x == 1) { target.takeHit(); System.out.println("Aaron hit " + this.target + "."); return true; } } if (shooter.equalsIgnoreCase("bob") == true) { int y = (int) (Math.random() * 2 + 1); if (y == 1) { target.takeHit(); System.out.println("Bob hit " + this.target + "."); return true; } } if (shooter.equalsIgnoreCase("charlie") == true) { target.takeHit(); System.out.println("Charlie hit " + this.target + "."); return true; } else { System.out.println(this.shooter + " missed " + this.target); } } public void pickTarget() { if (shooter.equalsIgnoreCase("charlie") == false) { target = "Charlie"; } if (shooter.equalsIgnoreCase("bob") == false) { target = "Bob"; } if (shooter.equalsIgnoreCase("aaron") == false) { target = "Aaron"; } } } public boolean continueDuel() { if ((charlie.isStillAlive()) && (bob.isStillAlive())) { return true; } if ((charlie.isStillAlive()) && (aaron.isStillAlive())) { return true; } if ((aaron.isStillAlive()) && (bob.isStillAlive())) { return true; } else { return false; } } }

The last method is giving me an error, which I understand, but I don't see any other way to do it.
Should each shooter have his own class? How can I check to make sure at least two people are alive after each round?

Yes I do, I forgot the () on both so the compiler was not looking for the methods. Right? Thanks for the help

Okay I got that. Now I am trying to test the program but the tester I have created is not compiling. Here is the tester:

public class TemperatureDemo { public static void main(String[] args) { Temperature temperature1, temperature2; String character1, character2; float temperatureValue1, temperatureValue2; float degreesC1, degreesC2; float degreesF1, degreesF2; temperature1 = new Temperature(); temperature1.setValue(); temperature1.setCharacter(); degreesC1 = temperature1.getDegreesC; degreesF1 = temperature1.getDegreesF; } }

The error says that it cannot find either getDegreesC or getDegreesF.
Some help please.

Why do I keep receiving a complier message reading: unexpected types?? The error is occuring at the method setCharacter() (lines 37 and 41 specfically), it doesn't make sense to me. I am using a string method with a String variable (character). To determine if the program will convert to degreesC or degreesF. Where did I go wrong?

import java.util.*; public class Temperature { private String character; private float temperatureValue; private float degreesC, degreesF; Scanner keyboard= new Scanner(System.in); public Temperature() { temperatureValue = 0; character = "c"; } public Temperature(float aTempValue) { temperatureValue = 0; } public Temperature(String aCharacter) { character = "c"; } public Temperature(float aTempValue, String aCharacter) { setBoth(temperatureValue , character); } public void setValue() { System.out.println("Enter temperature value."); temperatureValue = keyboard.nextFloat( ); } public void setCharacter() { System.out.println("Degrees or farenheit?"); character = keyboard.next( ); if (character.charAt(0) = "f") { setDegreesC(); } if (character.charAt(0) = "c") { setDegreesF(); } } public void setBoth(float aTempValue, String aCharacter) { System.out.println("Enter temperature value, then 'degrees'" + " or 'farenheit'"); temperatureValue = keyboard.nextFloat( ); character = keyboard.next( ); } public void setDegreesC() { degreesC = (5 * (degreesF - 32)) / 9; } public void setDegreesF() { degreesF = ((9 * degreesC) / 5) + 32; } public float getValue() { return temperatureValue; } public String getCharacter() { return character; } public float getDegreesC() { return degreesC; } public float getDegreesF() { return degreesF; } }

This is my first time using instance variables and the 'new' operator, so bear with me. I am trying to make a program that functions as an odometer, with a trip odometer and total odometer. I have included a method that resets the trip odometer before each trip. There are three different trips, but within each trip there are smaller trips that accumulate on the trip odometer. The user inputs mpg and miles driven on each trip. It then ouputs their mpg, trip odometer, total odometer, and gallons of gasoline used since last reset (for each trip).

I am having a problem with the total odometer. I need it to add each trip odometer for a grand total but it is only echoing the trip odometer.
Here's my code...

import java.util.*;

public class Odometer2 { private double tripOdometer; private double addTrip; private double userMilesPerGallon; private double calculatedMilesPerGallon; private double gallonsOfGasoline = 0; private double totalOdometer; Scanner keyboard = new Scanner(System.in); public void setResetOdometer() { tripOdometer = 0; } public void setUserMilesPerGallon() { System.out.println("Enter fuel efficiency (mpg)."); userMilesPerGallon = keyboard.nextDouble( ); } public void setTripOdometer() { System.out.println("Enter miles driven for first trip."); addTrip = keyboard.nextDouble( ); while (addTrip >= 0) { tripOdometer = tripOdometer + addTrip; System.out.println("Enter miles driven for next trip, or -1"); System.out.println("to exit."); addTrip = keyboard.nextDouble( ); } totalOdometer = totalOdometer + tripOdometer; } public double getUserMilesPerGallon() { return userMilesPerGallon; } public double getGallonsOfGasoline() { gallonsOfGasoline = (tripOdometer / userMilesPerGallon); return gallonsOfGasoline; } public double getTripOdometer() { return tripOdometer; } public double getTotalOdometer() { return totalOdometer; } }

And the tester...


public class Odometer2Tester { public static void main (String[] args) { Odometer2 trip1 = new Odometer2(); Odometer2 trip2 = new Odometer2(); Odometer2 trip3 = new Odometer2(); double tripOdometer1, tripOdometer2, tripOdometer3; double userMilesPerGallon1, userMilesPerGallon2, userMilesPerGallon3; double gallonsOfGasoline1 = 0, gallonsOfGasoline2 = 0, gallonsOfGasoline3 = 0; double totalOdometer1, totalOdometer2, totalOdometer3; trip1.setResetOdometer(); trip1.setUserMilesPerGallon(); userMilesPerGallon1 = trip1.getUserMilesPerGallon(); trip1.setTripOdometer(); tripOdometer1 = trip1.getTripOdometer(); totalOdometer1 = trip1.getTotalOdometer(); gallonsOfGasoline1 = trip1.getGallonsOfGasoline(); trip2.setResetOdometer(); trip2.setUserMilesPerGallon(); userMilesPerGallon2 = trip2.getUserMilesPerGallon(); trip2.setTripOdometer(); tripOdometer2 = trip2.getTripOdometer(); totalOdometer2 = trip2.getTotalOdometer(); gallonsOfGasoline2 = trip2.getGallonsOfGasoline(); trip3.setResetOdometer(); trip3.setUserMilesPerGallon(); userMilesPerGallon3 = trip3.getUserMilesPerGallon(); trip3.setTripOdometer(); tripOdometer3 = trip3.getTripOdometer(); totalOdometer3 = trip3.getTotalOdometer(); gallonsOfGasoline3 = trip3.getGallonsOfGasoline(); System.out.println(" "); System.out.println(" "); System.out.println("For trip1, the trip odometer has been reset to zero miles."); System.out.println("Fuel efficiency for your vehicle: " + userMilesPerGallon1 + " mpg."); System.out.println("Trip odometer: " + tripOdometer1 + " miles."); System.out.println("Total odometer: " + totalOdometer1 + " miles."); System.out.println("Number of gallons of gasoline consumed since last reset: " + gallonsOfGasoline1 + " gallons."); System.out.println(" "); System.out.println("For trip2, the trip odometer has been reset to zero miles."); System.out.println("Fuel efficiency for your vehicle: " + userMilesPerGallon2 + " mpg."); System.out.println("Trip odometer: " + tripOdometer2 + " miles."); System.out.println("Total odometer: " + totalOdometer2 + " miles."); System.out.println("Number of gallons of gasoline consumed since last reset: " + gallonsOfGasoline2 + " gallons."); System.out.println(" "); System.out.println("For trip3, the trip odometer has been reset to zero miles."); System.out.println("Fuel efficiency for your vehicle: " + userMilesPerGallon3 + " mpg."); System.out.println("Trip odometer: " + tripOdometer3 + " miles."); System.out.println("Total odometer: " + totalOdometer3 + " miles."); System.out.println("Number of gallons of gasoline consumed since last reset: " + gallonsOfGasoline3 + " gallons."); } }

Thanks for the help. I both wrote it out and looked at the code provided. Makes sense now.

row numStars 1 size -1 2 size -2 So... numStars = size -rowNum
initialization = size -1
boolean expression = numStars >= 0
change = numStars-- (one less star on each line)

I am trying to make a program that prints a triangle made of asterisks with maximum length of user input:
So if the user inputs 5, it should look like this:
*
**
***
****
*****
****
***
**
*
I got my program to do the first loop, up until the maximum. I would appreciate some help on how to make it flip.
Is it a separate for-loop? Is it another, nested, for-loop?
Here is my code:

import java.util.*; class TriangleProgram { public static void main (String[] args) { System.out.println("Enter the size of a triangle, an integer from"); System.out.println("1 to 50 please."); Scanner keyboard = new Scanner(System.in); int size; int x, y; int a, b; size = keyboard.nextInt( ); for (x = 1; x <= size; x++) //number of loops to print { for (y = 1 ; y <= x ; y++) //number of aestriks to print on a line System.out.print("*"); System.out.println(); } } }

Now I see!
1. I stored the calculated height as a double
2. Changed the 13 to 13.0 to convert to double,
3. Type casted the height to an integer and did integer arithmetic to separate feet from inches.
4. Also declared inches as decimal format object and defined it as: height % 12.

if ((gender.equalsIgnoreCase("male")) == true) { int feetMaleChild; DecimalFormat inchesMaleChild = new DecimalFormat("0"); heightMaleChild = ((heightMother * (13.0 / 12)) + heightFather) / 2; feetMaleChild = (int)heightMaleChild / 12; System.out.println("Estimated height of male child, will be: " + feetMaleChild + " feet & " + inchesMaleChild.format(heightMaleChild % 12) + " inches."); System.out.println(" "); }

How is the input not an integer though? I am asking for two whole numbers, feet first then inches. When I replace '12' with 12.0, I get an error: "loss of precision".

The output is wrong because if I input '10' then '0' for height of both parents it ouputs that the height of the male child will be 10 feet and 0 inches. The correct answer should be 10 feet and 5 inches roughly.

And I still don't understand why it is not allowing user input after asking: "Enter another gender to keep going or 'stop' to quit." It goes straight to the next question.

Output looks like this:

Enter another gender to keep going or 'stop' to quit.
Enter father's height, feet first then inches.
Seperate feet and inches by a space.
(Then allows user input)

I am making a program that estimates the height of a child based off gender, height of mother, height of father, and given equations. The program should allow the user to enter a new set of values and output predicted height until user decides to exit. Here is my code. When I run the program, first of all the calculations are coming out wrong and secondly, after the loop has ran, it skips the second gender/stop input line and goes straight to asking for height of father again.
I have attached a copy of my output.

import java.util.*; public class HeightProgram { public static void main(String[] args) { System.out.println("I will estimate the height of a child in"); System.out.println("feet and inches."); Scanner keyboard = new Scanner(System.in); int heightMother, heightFather; int heightMaleChild, heightFemaleChild; String gender; System.out.println("Enter gender using 'male' or 'female'. Enter stop"); System.out.println("to quit:"); gender = keyboard.nextLine( ); System.out.println(" "); while(!gender.equalsIgnoreCase("stop")) { System.out.println("Enter father's height, feet first then inches,"); System.out.println("Seperate feet and inches by a space."); int feetFather, inchesFather; feetFather = keyboard.nextInt( ); inchesFather = keyboard.nextInt( ); heightFather = (feetFather * 12) + inchesFather; System.out.println(" "); System.out.println("Enter mother's height, feet first then inches,"); System.out.println("Seperate feet and inches by a space."); int feetMother, inchesMother; feetMother = keyboard.nextInt( ); inchesMother = keyboard.nextInt( ); heightMother = (feetMother * 12) + inchesMother; System.out.println(" "); if ((gender.equalsIgnoreCase("male")) == true) { int feetMaleChild; int inchesMaleChild; heightMaleChild = ((heightMother * (13 / 12)) + heightFather) / 2; feetMaleChild = heightMaleChild / 12; inchesMaleChild = heightMaleChild % 12; System.out.println("Estimated height of male child, will be: " + feetMaleChild + " feet & " + inchesMaleChild + " inches."); } else if ((gender.equalsIgnoreCase("female") == true)) { int feetFemaleChild; int inchesFemaleChild; heightFemaleChild = ((heightFather * (12 / 13)) + heightMother) / 2; feetFemaleChild = heightFemaleChild / 12; inchesFemaleChild = heightFemaleChild % 12; System.out.print("Estimated height of female child, will be: " + feetFemaleChild + " feet & " + inchesFemaleChild + " inches."); System.out.println(" "); } System.out.println("Enter another gender to keep going or 'stop' to quit."); gender = keyboard.nextLine( ); System.out.println(" "); } } }

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