Pseudocode to Java Programming Code

Description

1REPEAT

2 PROMPT nonRecyclableAmount

3 READ nonRecyclableAmount

4 IF nonRecyclableAmount < 0 ) THEN

5 PRINT “ERROR MESSAGE”

6 END IF

7UNTIL (nonRecyclableAmount > 0)

8REPEAT

9 PROMPT recyclableAmount

10 READ recyclableAmount

11 IF recyclableAmount < 0 ) THEN

12 PRINT “ERROR MESSAGE”

13 END IF

14UNTIL (recyclableAmount < 0 )

15

16DO 1 TO 4

17 PROMPT classStanding

18 READ classStanding

19 SET noOfStudentsEnrolled = -1

20 REPEAT

21 PROMPT noOfStudentsEnrolled

22 READ noOfStudentsEnrolled

23 IF noOfStudentsEnrolled < 0 THEN

24 PRINT “ERROR MESSAGE”

25 END IF

26 UNTIL (noOfStudentsRolled > 0 )

27

28 SET classNonRecyclableAmount = nonRecyclableAmount * noOfStudentsEnrolled

29 SET classRecyclableAmount = recyclableAmount * noOfStudentsEnrolled

30

31 SET totalNoOfSTudents += noOfStudentsEnrolled

32 PRINT classSummary

33END DO

34SET averageNonRecyclableAmount = totalNonRecyclableAmount / 4

35SET averageRecyclableAmount = totalRecyclableAmount / 4

have to convert this to java file. i already did the pseudo. ill provide the full prompt if you cant read it. my teacher gave me 100% with the pseudo, i just cant figure out the code to work2 attachmentsSlide 1 of 2

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Programming Assignment ¾ Scenario: The Office of Sustainability at Mason has recently started an ecological study to determine the impact of the trash generated, by its students, on the surrounding wildlife. You have been hired by the Office of Sustainability to calculate the amount of trash (recycling and non-recyclable materials) generated by each class standing (freshman, sophomore, junior, and senior). Your goal is to create an application that allows a user (a GMU employee) to initially set the average individual’s yearly non-recyclable and recyclable material amount. The application should only accept positive values for both the non-recyclable and recyclable material amounts. If the user provides a negative value, the application should re-prompt the user until the given value is valid. If the given value is invalid, provide an error message for the user. Once, the valid individuals average yearly nonrecyclable material and recyclable amounts are entered, the application should allow you to enter one class standing information at a time. Each class standing information is composed of the class standing name (freshman, sophomore, junior, and senior) and the number of students enrolled. The number of students must also be a positive number. The application should re-prompt the user until the given value is valid. If the given value is invalid, provide an error message for the user. Material Type Non-Recyclable Material Recyclable Material Average Amount of Waste Per Person in LBS (2020) 525.44 1116.56 After each class standing, the application must print a well-formatted message that contains the class standing, the total number of students for that class, and the number of total amount of waste generated (non-recyclable and recyclable material). Upon completion of entering all the class standing data, the application will print a well-formatted report that includes the total number of students across all class standing, and an average of the Non-recyclable and recyclable materials generated across all class standing. Other Requirements: • • • • You may not ask the user how many class standings they will enter Your solution must not use arrays. Remember to think about what constitutes valid input. Your solution must address this. Your solution may not use any functions or language constructs not covered during this semester’s IT 106 without prior authorization from your instructor, even if you know other functions or language constructs. We want everyone to be on the same "playing field", regardless of previous programming exposure, and get practice with algorithmic design to solve problems (the intent of the course). Using something existing not discussed in class does not give you as much practice as solving the problem yourself. Doing this may lead to a substantial grade penalty, a grade of zero, or an Honor Code inquiry. When in doubt, ask! Hints: • • • There are a number of validations that must occur. Think about what type of validation might be appropriate and make sure these are all handled. Don’t forget about what you learned about data validation. When invalid data is entered, the user must be provided with an error message and then re-prompted for the data. Remember to parse String data using constructs like Integer.parseInt() and Double.parseDouble() where necessary. Additionally, when using these constructs, don’t forget to include try/catch for good validation. Your solution will require use of a loop structure. To Do (Check blackboard for Due Dates): Programming Assignment 1: Solution Design 1) Create a defining diagram that shows the input, processing, and output 2) Create a solution algorithm using pseudocode 3) Show testing using the desk checking table method, to include test data, expected results, and a desk checking table. Make sure your desk checking considers multiple cases including both valid and invalid test data to prove your algorithm will work in all cases Upload a Word document containing only items about to Blackboard Grading Criteria Requirement Points Defining Diagram with input, processing, and output 40 Efficient Solution Algorithm 40 Through Desk Checking Table including test data, and expected results 20 Programming Assignment 2: Solution Implementation Write a well-documented, efficient Java program that implements the algorithm you identified. Include appropriate documentation as identified in the documentation expectations document. Note: You must use the JOptionPane class for input/output. Additionally, if you System.exit as shown in the textbook, it may only be used as the absolute last line in the program. You may not use System.exit, or any variant that exits the program in the middle of the program. The program should be designed to only exit once the algorithm has finished. Upload the .java file of the final program to Blackboard. Be careful that you do not submit a .class file instead of a .java file. Your program must successfully compile using jGrasp. Partial credit is available. Any final program that does not compile, for any reason, will receive an automatic zero. Other IDEs often place in additional code that you are unaware of, doing too much of the work for you. You are strongly discouraged from using IDEs other than jGrasp. Grading Criteria Requirement Implementation of Java Program, using efficient practices where appropriate, such as the use of constants, good variable names, no redundant code, etc. Appropriate objective-style documentation Appropriate intermediate comments Points 70 10 20 IT 106: Introduction to IT Problem Solving Using Computer Programming Midpoint Review In This Lecture • Midpoint Review IT 106: Introduction to IT Problem Solving Using Computer Programming Questions? IT 106: Introduction to IT Problem Solving Using Computer Programming Using Constants and Variables • Variable: named memory location • Contents may change at run-time • Contents described by data type • Constant: value stays fixed after compilation • Constants may be assigned a symbolic name – Example: final int MAXIMUM_GRADE = 100; • Constant's literal value may be used directly – Example: 100 may be hard-coded into program • Don't do this! IT 106: Introduction to IT Problem Solving Using Computer Programming Using Constants and Variables (Cont'd) • Data type: specifies data in three ways • Kind of item being represented • Amount of memory item occupies • Operations that may be performed on item • Eight primitive (basic) data types: • byte, short, int, long, float, double, char, boolean • Reference types (classes) are built upon primitives • String IT 106: Introduction to IT Problem Solving Using Computer Programming Displaying Variables • Variables can be output in two ways • To the console (System.out.println) – Example: System.out.println("My grade: " + gradeEarned); • Through a GUI (JOptionPane.showMessageDialog) – Example: JOptionPane.showMessageDialog(null, "My grade: " + gradeEarned); • Concatenation: Joins arguments with the (+) operator IT 106: Introduction to IT Problem Solving Using Computer Programming Initializing and Declaring Variables • When initializing a variable, you must specify the data type, and a name for the variable • Examples: – int x = 1; – double d = 1.4; • An initial value is optional, but must be set before calculations occur IT 106: Introduction to IT Problem Solving Using Computer Programming Constants Final datatype CONSTANT_NAME = VALUE; final double PI = 3.14159; final int NUM_STUDENTS = 30; • By convention, constants use names that contain all capital letters. Words are separated by underscores IT 106: Introduction to IT Problem Solving Using Computer Programming Floating-Point Types • Floating-point numbers contain decimal positions • float – holds values up to 7 significant digits • double – holds values up to 15 significant digits • Significant digits indicate mathematical accuracy IT 106: Introduction to IT Problem Solving Using Computer Programming Floating-Point Types • Calculations involving floating-point numbers are approximated, due to accuracy issues. • Examples: – JOptionPane.showMessageDialog(null, 1.0 - 0.1 - 0.1 - 0.1 0.1); • Displays 0.6000000000000001 – JOptionPane.showMessageDialog(null, 1.0 - 0.9); • Displays: 0.09999999999999998 • Calculations involving integers are stored precisely • Calculations yield a precise integer result IT 106: Introduction to IT Problem Solving Using Computer Programming Numeric Type Conversion • Unifying type: highest type among mixed operands • Hierarchy: double, float, long, int, short, byte • Java converts nonconforming operands to highest type • Example: int hoursWorked = 37 double payRate = 6.73; double grossPay = hoursWorked * payRate; hoursWorked temporarily promoted to double type to perform calculation IT 106: Introduction to IT Problem Solving Using Computer Programming Explicit Typecasting • Place result type request in () before variable to be cast • Example: double money = 32.11 int dollars = (int) money; • Expression on right is converted to int • Data is truncated (possible loss of value) • Java compiler would not do this without the cast (no demotions) IT 106: Introduction to IT Problem Solving Using Computer Programming Integer Division • 5 / 2 yields an integer: 2 • 5.0 / 2 yields a double value 2.5 • 5 % 2 yields 1 (the remainder of the division) IT 106: Introduction to IT Problem Solving Using Computer Programming Remainder Operator • Examples: • An even number % 2 is always 0 • An odd number % 2 is always 1 • Suppose today is Saturday. You are your friends are going to meet in 10 days. What day is in 10 days? Saturday is the 6th day in a week A week has 7 days (6 + 10) % 7 is 2 The 2nd day in a week is Tuesday After 10 days IT 106: Introduction to IT Problem Solving Using Computer Programming Escape Sequence • Strings store character sequences • Escape sequence: backslash and character as one unit • Example: char aNewLine = '\n'; • Newline character moves cursor to the next line • Use of escape sequences • Example: JOptionPane.showMessageDialog(null, "Hello\nthere"); IT 106: Introduction to IT Problem Solving Using Computer Programming Escape Sequences (Cont'd) IT 106: Introduction to IT Problem Solving Using Computer Programming Using Input Dialog Boxes • showInputDialog() used to create input dialog boxes • Simplest version takes prompt, returns String • result = JOptionPane.showInputDialog("prompt"); • Note: You must DO something with the String result IT 106: Introduction to IT Problem Solving Using Computer Programming Example: Using Input Dialog Boxes Notice that there is a result from the input – so the method call is part of an expression No result from the output – so the method call is a statement IT 106: Introduction to IT Problem Solving Using Computer Programming Converting Input Dialog to Other Data Types • showInputDialog returns a String • Must be converted if the input is a different data type • Integer.parseInt • Double.parseDouble • Examples: • age = Integer.parseInt(JOptionPane.showInputDialog("age?")); • wage = Double.parseDouble(JOptionPane.showInputDialog("wage?")); IT 106: Introduction to IT Problem Solving Using Computer Programming Converting Input Dialog to Other Data Types (Cont'd) IT 106: Introduction to IT Problem Solving Using Computer Programming Operators • Arithmetic – defined for numeric types (+, -, *, /, %) • (% is only for int!) • Concatenation – defined for String (+( • Relational – defined for primitive types (>, =, 3) • && and (4 < 3) && (1 < 2) • || or (4 < 3) || (1< 2) IT 106: Introduction to IT Problem Solving Using Computer Programming Operator Precedence var++, var-+, - (Unary plus and minus), ++var,--var (type) Casting ! (Not) *, /, % (Multiplication, division, and remainder) +, - (Binary addition and subtraction) = (Comparison) ==, !=; (Equality) & (Unconditional AND) ^ (Exclusive OR) | (Unconditional OR) && (Conditional AND) Short-circuit AND || (Conditional OR) Short-circuit OR =, +=, -=, *=, /=, %= (Assignment operator IT 106: Introduction to IT Problem Solving Using Computer Programming Boolean Data Type • boolean type: holds one of two values: true or false • Example statements • boolean isItPayday = false; • boolean areYouBroke = true; • Six binary comparison operators • (= =), (>), ( =), (< =) • Results of operations: boolean true or false • Perform comparisons, assign results to boolean type • boolean isSixBigger = (6 > 5); • boolean isOTPay = (hours > 40); IT 106: Introduction to IT Problem Solving Using Computer Programming Relational Operators • Evaluates to a boolean IT 106: Introduction to IT Problem Solving Using Computer Programming Selection Statements • Pseudocode • IF….THEN….ENDIF • IF….THEN….ELSE IF….THEN….ENDIF • CASEOF …. ENDCASE • Java • if/else if/else • switch IT 106: Introduction to IT Problem Solving Using Computer Programming Simple if Statements if (booleanExpression) { statement(s); } if (radius >= 0) { area = radius * radius * PI; JOptionPane.showMessageDialog(null, "The area for the circle of radius " + radius + ” is " + area); } IT 106: Introduction to IT Problem Solving Using Computer Programming if Statement Caution • Common Logic Error if (radius >= 0); { area = radius*radius*PI; JOptionPane.showMessageDialog(null, "The area for the circle of radius " + radius + " is " + area); } Wrong IT 106: Introduction to IT Problem Solving Using Computer Programming if…else Statements if (booleanExpression) { statement(s)-for-the-true-case; } else { statement(s)-for-the-false-case; } true Statement(s) for the true case Boolean Expression false Statement(s) for the false case IT 106: Introduction to IT Problem Solving Using Computer Programming if…else Example if (radius >= 0) { area = radius * radius * 3.14159; JOptionPane.showMessageDialog(null, “The area for the circle of radius “ + radius + “ is “ + area); } else { JOptionPane.showMessageDialog(null,“Negative input”); } IT 106: Introduction to IT Problem Solving Using Computer Programming Multiple Alternative if Statements if (score >= 90.0) grade = 'A'; else if (score >= 80.0) grade = 'B'; else if (score >= 70.0) grade = 'C'; else if (score >= 60.0) grade = 'D'; else grade = 'F'; Equivalent if (score >= 90.0) grade = 'A'; else if (score >= 80.0) grade = 'B'; else if (score >= 70.0) grade = 'C'; else if (score >= 60.0) grade = 'D'; else grade = 'F'; IT 106: Introduction to IT Problem Solving Using Computer Programming Be careful of curly braces! • If there are no curly braces, only the first statement after the if or else is executed • Example: if (x == 100) boolean awesomeGrade = true; JOptionPane.showMessageDialog("You earned an A+!"); IT 106: Introduction to IT Problem Solving Using Computer Programming Ternary Operator • Represent an if/else statement block in one line • (booleanExp) ? true_branch : false_branch • Example: • JOptionPane.showMessageDialog(null, (num % 2 == 0)? num + “is even” : num + “is odd”); IT 106: Introduction to IT Problem Solving Using Computer Programming switch Statements • If a situation exists such that you want to choose one option from a "chain" of if statements, use a switch! • A switch expression can take in: • • • • • int short byte char String IT 106: Introduction to IT Problem Solving Using Computer Programming switch Statement Flow Chart status is 0 Compute tax for single filers break Compute tax for married file jointly break Compute tax for married file separatly break Compute tax for head of household break status is 1 status is 2 status is 3 default Default actions Next Statement IT 106: Introduction to IT Problem Solving Using Computer Programming switch Statement Example switch (status) { case 0: compute taxes for single filers; break; case 1: compute taxes for married file jointly; break; case 2: compute taxes for married file separately; break; case 3: compute taxes for head of household; break; default: JOptionPane.showMessageDialog(null, "Errors: invalid status"); break; } IT 106: Introduction to IT Problem Solving Using Computer Programming Problem Example • Scenario • Calculate a letter grade for a student taking a course that has equally weighted midterm and final exams. Assume only valid grades will be provided. IT 106: Introduction to IT Problem Solving Using Computer Programming Step 1: Define the Problem • Input • midtermExamGrade, finalExamGrade • Processes • • • • Prompt for exam scores Read exam scores Calculate grade Print grade • Output • finalGrade IT 106: Introduction to IT Problem Solving Using Computer Programming Step 2: Solution Algorithm BEGIN calculateFinalGrade PROMPT user for midtermExamGrade READ midtermExamGrade PROMPT user for finalExamGrade READ finalExamGrade SET averageGrade = (midtermExamGrade + finalExamGrade) / 2; IF averageGrade > 90 THEN SET finalGrade =‘A’; ELSE IF averageGrade > 80 THEN SET finalGrade =‘B’; ELSE IF grade > 70 THEN finalGrade = ‘C’; ELSE IF grade > 60 THEN finalGrade = ‘D’; ELSE finalGrade = ‘F’; ENDIF ENDIF ENDIF ENDIF PRINT 'The average grade is ', averageGrade, ' and the final grade is ', finalGrade IT 106: Introduction to IT Problem Solving Using Computer Programming Step 3: Test the Algorithm! • Don't forget the desk checking! IT 106: Introduction to IT Problem Solving Using Computer Programming Java Solution IT 106: Introduction to IT Problem Solving Using Computer Programm...