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Java Code for Sample Projects Loops

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The document describes a Java code sample that uses loops and conditional statements to calculate test scores and grades. It contains code to: 1) Take user input for 5 test scores and store them in an array. 2) Calculate a letter grade for each score using an if/else statement block. 3) Calculate the average of all scores by summing the array elements and dividing by the length. 4) Print a report with each test number, score, and grade along with the overall average.

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JavaCode for Sample Projects Loops and Conditional StatementsProject TestAverageAndGrade.java File importjavax.swing.*; public class TestAverageAndGrade { public static void main(String[] args) { String strScore; double score; doubleaverageTestScore = 0; String grade = ""; doublearTestScores[] = new double [5] ; String arLetterGrades[] = new String [5]; inttotalNumberOfTests = 5; inttestIdentifier = 1; Loops and Conditional Statements Project Page 1
while (testIdentifier<= totalNumberOfTests) { //take string input and convert to double strScore = JOptionPane.showInputDialog("Enter the score for Test #" + testIdentifier ); score = Integer.parseInt(strScore); //assign input score to an array of scores arTestScores[(testIdentifier - 1)] = score; //convert score to letter grade using calculateGrade method and assign to array of grades grade = calculateGrade (score); arLetterGrades[(testIdentifier - 1)] = grade; //increment testIdentifier counter testIdentifier = testIdentifier + 1; } //Reset testIdentifier to 1 for use in reporting testIdentifier = 1; //calculate average of scores using calculateArAverage method averageTestScore = calculateArAverage (arTestScores ); //Print Report System.out.println("TEST_____SCORE_____GRADE"); while (testIdentifier<= totalNumberOfTests) { System.out.println("# " + testIdentifier + " "+ arTestScores [(testIdentifier - 1)] + " " + arLetterGrades[(testIdentifier - 1)]); testIdentifier = testIdentifier + 1; } System.out.println("The average score for all the tests taken is: " + averageTestScore); Loops and Conditional Statements Project Page 2
} public static double calculateArAverage (double arNumbers []) { doublearAverage = 0; doublearTotal = 0; intnumArElements = 5; int count = 0; for (count = 0 ; count <numArElements; count++) { arTotal = arTotal + arNumbers[count]; } arAverage = (arTotal/numArElements); returnarAverage; } Loops and Conditional Statements Project Page 3
public static String calculateGrade(double testScore) { String letterGrade; if (testScore< 60) { letterGrade = "F"; } else if (testScore< 70) { letterGrade = "D"; } else if (testScore< 80) { letterGrade = "C"; } else if (testScore< 90) { letterGrade = "B"; } else { letterGrade = "A"; } returnletterGrade; } } Loops and Conditional Statements Project Page 4

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Java Code for Sample Projects Loops

  • 1. JavaCode for Sample Projects Loops and Conditional StatementsProject TestAverageAndGrade.java File importjavax.swing.*; public class TestAverageAndGrade { public static void main(String[] args) { String strScore; double score; doubleaverageTestScore = 0; String grade = ""; doublearTestScores[] = new double [5] ; String arLetterGrades[] = new String [5]; inttotalNumberOfTests = 5; inttestIdentifier = 1; Loops and Conditional Statements Project Page 1
  • 2. while (testIdentifier<= totalNumberOfTests) { //take string input and convert to double strScore = JOptionPane.showInputDialog("Enter the score for Test #" + testIdentifier ); score = Integer.parseInt(strScore); //assign input score to an array of scores arTestScores[(testIdentifier - 1)] = score; //convert score to letter grade using calculateGrade method and assign to array of grades grade = calculateGrade (score); arLetterGrades[(testIdentifier - 1)] = grade; //increment testIdentifier counter testIdentifier = testIdentifier + 1; } //Reset testIdentifier to 1 for use in reporting testIdentifier = 1; //calculate average of scores using calculateArAverage method averageTestScore = calculateArAverage (arTestScores ); //Print Report System.out.println("TEST_____SCORE_____GRADE"); while (testIdentifier<= totalNumberOfTests) { System.out.println("# " + testIdentifier + " "+ arTestScores [(testIdentifier - 1)] + " " + arLetterGrades[(testIdentifier - 1)]); testIdentifier = testIdentifier + 1; } System.out.println("The average score for all the tests taken is: " + averageTestScore); Loops and Conditional Statements Project Page 2
  • 3. } public static double calculateArAverage (double arNumbers []) { doublearAverage = 0; doublearTotal = 0; intnumArElements = 5; int count = 0; for (count = 0 ; count <numArElements; count++) { arTotal = arTotal + arNumbers[count]; } arAverage = (arTotal/numArElements); returnarAverage; } Loops and Conditional Statements Project Page 3
  • 4. public static String calculateGrade(double testScore) { String letterGrade; if (testScore< 60) { letterGrade = "F"; } else if (testScore< 70) { letterGrade = "D"; } else if (testScore< 80) { letterGrade = "C"; } else if (testScore< 90) { letterGrade = "B"; } else { letterGrade = "A"; } returnletterGrade; } } Loops and Conditional Statements Project Page 4