Week 3 Programming Assignment

Multiway Branch


        import java.util.Scanner;
        public class Multiway_Branch{
            public static void main(String[] args) {
                Scanner scanner = new Scanner(System.in);
                while(true) {
                    System.out.print("Enter first score: ");
                    double student_score1 = scanner.nextDouble();
                    System.out.print("Enter second score: ");
                    double student_score2 = scanner.nextDouble();
                    System.out.print("Enter third score: ");
                    double student_score3 = scanner.nextDouble();
            
                    double avg_score = (student_score1 + student_score2 + student_score3)/ 3;
            
                    
                    if(avg_score >= 90 && avg_score <= 100) {
                        System.out.println("Excellent work!");
                    } else if( avg_score >= 80) {
                        System.out.println("Great work!");
                    } else if( avg_score >= 70) {
                        System.out.println("Hang in there and work hard!"); 
                    } else if(  avg_score >= 60) {
                        System.out.println("Passing, but marginal"); 
                    } else if( avg_score < 60) {
                        System.out.println("Failing"); 
                    } else {
                        System.out.println("Invalid response");
                    }
                
                    System.out.printf("Average of the student's 3 scores: %.2f", avg_score);
        
        
                    scanner.nextLine();
                    System.out.print("\nWould you like to run program again (Enter yes or no)? ");
                    String user_value = scanner.nextLine();
                    
                    if(user_value.equals("yes")) {
                        System.out.print("Restarting...");
                    } else {
                        System.out.println("Goodbye");
                        break;
                    }
                }
               
            }   
        }
}

Switch Case


              import java.util.*;
public class Main {
    public static void main(String[] args) {
        int number;
        Scanner stdin = new Scanner(System.in);

        System.out.print("Enter a single digit number between 0 and 9: ");
        number = stdin.nextInt();

        switch(number) { //look at the first character of
            case 0: System.out.println("You entered a zero.");
                break;
            case 1:
            case 3:
            case 5:
            case 7:
            case 9: System.out.println("You entered an odd number.");
                break;
            case 2:
            case 4:
            case 6:
            case 8: System.out.println("You entered an even number.");
                break;
            default:
                System.out.println("ERROR: Bad input: " + number);
                break;
        }//end switch
        
        // // ternary operator
        // System.out.print("Enter a number: ");
        // int user_value = stdin.nextInt();

        // String output = (user_value == 0 || user_value % 2 == 0) ? "You entered a 0" : "You entered an even number" : "ERROR: Bad input";
        // System.out.print(output);






    }//end main method
}//end class

Nested if/else Statements


              import java.util.Scanner;

public class Nested_If_Statements {
   public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);

    // inputs 
    System.out.print("How many scoops of ice scream are there? ");
    int totalNumberOfScoops = scanner.nextInt();

    System.out.print("How many T of sprinkles are there? ");
    int availableSprinkles = scanner.nextInt();

    System.out.print("How many T of M&Ms are there? ");
    int availableMnMs = scanner.nextInt();

    System.out.print("How many scoops in the order? ");
    int orderedScoops = scanner.nextInt();

    System.out.print("Do they want sprinkles? ");
    String wantsSprinkles = scanner.nextLine().trim().toLowerCase();

    System.out.print("Do they want M&Ms? ");
    String wantsMms = scanner.nextLine().trim().toLowerCase();

    //using ternary operater to reduce lines of code and if/else statements
    int neededSprinkles = wantsSprinkles.equals("yes") ? orderedScoops * 2 : 0;
    int neededMms = wantsMms.equals("yes") ? orderedScoops * 2 : 0;

    // logic for displaying output through nested if/else statement 
    if (orderedScoops > totalNumberOfScoops) {
        System.out.println("Sadness.");
    } else if (neededSprinkles > availableSprinkles || neededMms > availableMnMs) {
        System.out.println("Sorry, can’t top it.");
    } else {
        System.out.print("Order up: ice cream");
        if (wantsSprinkles.equals("yes") || wantsMms.equals("yes")) {
            System.out.print(" with " + 
                    (wantsSprinkles.equals("yes") ? "sprinkles" : "") + 
                    (wantsSprinkles.equals("yes") && wantsMms.equals("yes") ? " and " : "") + 
                    (wantsMms.equals("yes") ? "M&Ms" : ""));
        
        }
        System.out.println();
    }

    scanner.close();
   } 
}