Chris Hathaway

agreed i apologize!

Basically im supposed to be creating a class to model a student, and a couple of test grades,

this is what she put on the description for the project
Part I:
Write a program Student.java to model a college student and test each method in StudentTest.java.

Part II:
Add studentID to Student.java to describe a college student id number, a unique number.
Therefore, each student is created with a name, an id, 0 for both test one and test two.
A studentID should be read-only, it must be generated in the constructor.
A method getStudentID() should be provided to allow an access to a student id.

Let me know if I wasnt clear enough, or if you want any specific details or such.

I dont really get how I am supposed to be doing this, my teacher mentioned writing two different programs at the same time.

Was wondering if you all could throw out some pointers, or maybe some basic tips that would get me in the right direction.

Ok I did some messing around and i got it to display the letter, but now its just displaying the wrong letter grade

heres what i added!
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for( int index = 0; index < grade.length; index++) { if( average[index] >= 90) { grade[index] = grade[0]; } else if( average[index] <= 89) { grade[index] = grade[1]; } else if( average[index] <= 70) { grade[index] = grade[2]; } else if( average[index] <= 69) { grade[index] = grade[3]; }
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Hello again Javaranch!

I am currently working on a project that asks the user to enter in two test grades for four different students, once you have the test grades, it gives you the average of both of the students test grades, followed by a letter grade to correspond to it.
I have everything working except for the letter grade part!!! I cant figure out how to make it present a letter grade(A, B, C, D, F) based on the average of both test scores.

Here is my code so far!
Please explain your reasoning behind your logic!!!

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import java.util.Scanner; import java.lang.String; public class TestScores { public static void main (String[] args) { //Variables int[] testOne = new int[4]; int[] testTwo = new int[4]; double[] average = new double[4]; char[] grade = {'A', 'B', 'C', 'D', 'F'}; Scanner scan = new Scanner(System.in); //Input System.out.println("Enter in Test Scores for Each Student."); System.out.println("------------------------------------"); System.out.println("For Test One..."); for ( int i = 0; i < testOne.length; i++) { System.out.print("Enter score" + (i + 1) + ":"); testOne[i] = scan.nextInt(); } System.out.println(); System.out.println("For Test Two..."); for ( int i = 0; i < testTwo.length; i++) { System.out.print("Enter score" + (i + 1) + ":"); testTwo[i] = scan.nextInt(); } //Processing for( int index = 0; index < testOne.length; index++) { average[index] = (testOne[index] + testTwo[index])/2; } //Output System.out.println(); System.out.println("Test 1\tTest 2\tAverage\t\tGrade"); System.out.println("------\t------\t-------\t\t-----"); for ( int index = 0; index < testOne.length; index++) { System.out.println(testOne[index] + "\t" + testTwo[index] + "\t" + average[index]); } } }
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Well I got to theory crafting and started trying random stuff, I put the whole code, give or take a few brackets, in a do - while loop, and made sure the "Int choice = 0;" was outside the loop, final code looks like this...

I remember you saying
1. that you doubted the design of a do - while switch that exits from inside itself
2. that my main method was way too long, and alot of repeated code.

Do you think you could elaborate for future reference? Would be very helpful

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import java.util.Scanner; import java.lang.String; public class PlusMinus { public static void main (String[] args) { int choice = 0; do { //Variables Scanner scan = new Scanner(System.in); String equation = ""; int numberone, numbertwo; double answer, dbl1, dbl2; final int ADD = 1, SUBTRACT = 2, MULTIPLY = 3, DIVIDE = 4, EXIT = 5; //Input(for the sake of putting something here!) /*System.out.println("Choose from the following operations..."); System.out.println(); System.out.println("1. Add"); System.out.println("2. Subtract"); System.out.println("3. Multiply"); System.out.println("4. Divide"); System.out.println(); System.out.print("Select the corresponding number: "); choice = scan.nextInt(); */ //Processing System.out.println("Choose from the following operations..."); System.out.println(); System.out.println("1. Add"); System.out.println("2. Subtract"); System.out.println("3. Multiply"); System.out.println("4. Divide"); System.out.println("5. Exit Program"); System.out.println(); System.out.print("Select the corresponding number: "); choice = scan.nextInt(); switch (choice) { case 1: System.out.print("Enter first number: "); numberone = scan.nextInt(); System.out.print("Enter second number: "); numbertwo = scan.nextInt(); answer = (numberone + numbertwo); equation = ((numberone) + " + " + (numbertwo) + " = " + (answer)); break; case 2: System.out.print("Enter first number: "); numberone = scan.nextInt(); System.out.print("Enter second number: "); numbertwo = scan.nextInt(); answer = (numberone - numbertwo); equation = ((numberone) + " - " + (numbertwo) + " = " + (answer)); break; case 3: System.out.print("Enter first number: "); numberone = scan.nextInt(); System.out.print("Enter second number: "); numbertwo = scan.nextInt(); answer = (numberone * numbertwo); equation = ((numberone) + " * " + (numbertwo) + " = " + (answer)); break; case 4: System.out.print("Enter first number: "); numberone = scan.nextInt(); System.out.print("Enter second number: "); numbertwo = scan.nextInt(); dbl1 = numberone; dbl2 = numbertwo; answer = (dbl1 / dbl2); equation = ((numberone) + " / " + (numbertwo) + " = " + (answer)); break; case 5: System.exit(1); break; } //Output System.out.println(equation); System.out.println(); System.out.println("------------------------------------------------------------------"); System.out.println(); }while(choice != 5); } }
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Thanks for all your help! Ended up figuring it out myself!

Hi again Java Ranch!

Im currently working on a project that lets you add, subtract, multipy, or divide 2 integers, and then gives you the answer

I wanted to put a while or do-while switch on it so that when you get your answer,
it restarts itself and prompts you to pick which operand you want and which two integers to be used, but I havent been
able to figure it out.

Help and suggestions would be great! Please explain your logic behind your reasoning!

Here is my code so far!

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import java.util.Scanner; import java.lang.String; public class PlusMinus { public static void main (String[] args) { //Variables Scanner scan = new Scanner(System.in); String equation = ""; int numberone, numbertwo, choice = 0; double answer; final int ADD = 1, SUBTRACT = 2, MULTIPLY = 3, DIVIDE = 4, EXIT = 5; //Input /*System.out.println("Choose from the following operations..."); System.out.println(); System.out.println("1. Add"); System.out.println("2. Subtract"); System.out.println("3. Multiply"); System.out.println("4. Divide"); System.out.println(); System.out.print("Select the corresponding number: "); choice = scan.nextInt(); */ //Processing System.out.println("Choose from the following operations..."); System.out.println(); System.out.println("1. Add"); System.out.println("2. Subtract"); System.out.println("3. Multiply"); System.out.println("4. Divide"); System.out.println("5. Exit Program"); System.out.println(); System.out.print("Select the corresponding number: "); choice = scan.nextInt(); switch (choice) { case 1: System.out.print("Enter first number: "); numberone = scan.nextInt(); System.out.print("Enter second number: "); numbertwo = scan.nextInt(); answer = (numberone + numbertwo); equation = ((numberone) + " + " + (numbertwo) + " = " + (answer)); choice = choice - 5; break; case 2: System.out.print("Enter first number: "); numberone = scan.nextInt(); System.out.print("Enter second number: "); numbertwo = scan.nextInt(); answer = (numberone - numbertwo); equation = ((numberone) + " - " + (numbertwo) + " = " + (answer)); choice = choice - 5; break; case 3: System.out.print("Enter first number: "); numberone = scan.nextInt(); System.out.print("Enter second number: "); numbertwo = scan.nextInt(); answer = (numberone * numbertwo); equation = ((numberone) + " * " + (numbertwo) + " = " + (answer)); choice = choice - 5; break; case 4: System.out.print("Enter first number: "); numberone = scan.nextInt(); System.out.print("Enter second number: "); numbertwo = scan.nextInt(); answer = (numberone / numbertwo); equation = ((numberone) + " / " + (numbertwo) + " = " + (answer)); choice = choice - 5; break; case 5: System.exit(1); break; } //Output System.out.println(equation); } }
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Hi, I am currently developing a program that will allow you to enter in two dates and it will tell you the difference between them. Im currently having problems getting the months to properly work, the way I want it to work is that the user enters in the month(such as january or april) for each date, and a year for each date(such as 2012 or 1776). The year difference works fine, but for the months I cant seem to figure it out, any help would be greatly appreciated! Here is my code so far!
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/*Variables: *There are variables for each month of the year, also including spaces for year one and two, months one and two, *and the differences between the months and the years. * *Input: *The user inputs the months and the years for two different dates to be compared * * *Processing: *it compares the years to see which one is bigger, then subtracts the bigger year from the smaller year. *then looks to see which month the user typed in, giving it a number value * * *Output: *It prints out the user inputed dates, then prints out the difference in the two dates *by months and years. * * */ import java.util.Scanner; import java.lang.String; public class DateComparison { public static void main (String[] args) { //Variables String monthnumberone, monthnumbertwo; int firstmonthnumber = 0, secondmonthnumber = 0; int yearnumberone, yearnumbertwo, yeardifference = 0, monthdifference = 0; Scanner scan = new Scanner(System.in); //Input System.out.println("For the first date..."); System.out.print("Enter month: "); monthnumberone = scan.next(); System.out.print("Enter Year: "); yearnumberone = scan.nextInt(); System.out.println(); System.out.println("For the first date..."); System.out.print("Enter month: "); monthnumbertwo = scan.next(); System.out.print("Enter Year: "); yearnumbertwo = scan.nextInt(); //Processing //Month Number 1 if (monthnumberone.equalsIgnoreCase("January")) { firstmonthnumber = 1; } if (monthnumberone.equalsIgnoreCase("February")) { firstmonthnumber = 2; } if (monthnumberone.equalsIgnoreCase("March")) { firstmonthnumber = 3; } if (monthnumberone.equalsIgnoreCase("April")) { firstmonthnumber = 4; } if (monthnumberone.equalsIgnoreCase("May")) { firstmonthnumber = 5; } if (monthnumberone.equalsIgnoreCase("June")) { firstmonthnumber = 6; } if (monthnumberone.equalsIgnoreCase("July")) { firstmonthnumber = 7; } if (monthnumberone.equalsIgnoreCase("August")) { firstmonthnumber = 8; } if (monthnumberone.equalsIgnoreCase("September")) { firstmonthnumber = 9; } if (monthnumberone.equalsIgnoreCase("October")) { firstmonthnumber = 10; } if (monthnumberone.equalsIgnoreCase("November")) { firstmonthnumber = 11; } if (monthnumberone.equalsIgnoreCase("December")) { firstmonthnumber = 12; } //Month Number 2 if (monthnumbertwo.equalsIgnoreCase("January")) { secondmonthnumber = 1; } if (monthnumbertwo.equalsIgnoreCase("February")) { secondmonthnumber = 2; } if (monthnumbertwo.equalsIgnoreCase("March")) { secondmonthnumber = 3; } if (monthnumbertwo.equalsIgnoreCase("April")) { secondmonthnumber = 4; } if (monthnumbertwo.equalsIgnoreCase("May")) { secondmonthnumber = 5; } if (monthnumbertwo.equalsIgnoreCase("June")) { secondmonthnumber = 6; } if (monthnumbertwo.equalsIgnoreCase("July")) { secondmonthnumber = 7; } if (monthnumbertwo.equalsIgnoreCase("August")) { secondmonthnumber = 8; } if (monthnumbertwo.equalsIgnoreCase("September")) { secondmonthnumber = 9; } if (monthnumbertwo.equalsIgnoreCase("October")) { secondmonthnumber = 10; } if (monthnumbertwo.equalsIgnoreCase("November")) { secondmonthnumber = 11; } if (monthnumbertwo.equalsIgnoreCase("December")) { secondmonthnumber = 12; } if (yearnumberone > yearnumbertwo) { yeardifference = (yearnumberone - yearnumbertwo); } if (yearnumberone < yearnumbertwo) { yeardifference = (yearnumbertwo - yearnumberone); } //Month Difference if (firstmonthnumber > secondmonthnumber) { monthdifference = (firstmonthnumber - secondmonthnumber); } //Output System.out.println("These dates are: " + (yeardifference) + " years and " + (monthdifference) + " months apart."); } }

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Thanks to all whi helped! Figured it out, just removed Line from nextLine, works perfectly now

I get the logic i guess, I still don`t see why i wouldnt have the same problem for the first section.

so then why does it work for the 1st section of code and not the second? Im having trouble getting what your saying lol

im making a program that compares the dates and tells you how far apart they are timewise. im having a small problem at the moment thought...

here is part of my code:

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System.out.println("For the first date..."); System.out.print("Enter month: "); monthnumberone = scan.nextLine(); System.out.print("Enter Year: "); yearnumberone = scan.nextInt(); System.out.println("For the first date..."); System.out.print("Enter month: "); monthnumbertwo = scan.nextLine(); System.out.print("Enter Year: "); yearnumbertwo = scan.nextInt();

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what it should do is

1. print "For the first date..."
then "enter month:" right under it

2. wait for user input

3. print "Enter year:"

4. wait for input

but on the second section of code, where it uses monthnumbertwo and yearnumbertwo, its displaying "Enter Year:" and "Enter Month:" at the same time. I have no idea what the problem is...

thank you very much it worked perfectly, but I was wondering if you could explain your thinking, just for notes and future reference!

Your right thats what my code does at the moment.

What I need it to do is to update the remaining balance

like say I use $47.63, which was the teachers example, she got back

4 ten dollar bills
1 five dollar bills
2 one dollar bills
2 quarters
1 dimes
0 nickels
3 pennies

I dont think my code is updating the remaining balance, its still just dividing $63.97, thus giving me values like 6397 pennies