CSC215-Discussion-Fall-2023

Week 2 Practice Problems (Sample Solutions)
[Topic: CSC101]

For this week, you will be tested on materials that you should have learned in CSC 101. I understand that you might not have gotten to cover everything from CSC 101, so do the best you can and get as far as you can.

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• Problem 1: Create a method that takes 2 integers, and returns the sum of the absolute value of both integers.

System.out.println(absoluteAdd(-5, -7)); // 12
System.out.println(absoluteAdd(6, -2)); // 8
System.out.println(absoluteAdd(-3, 1)); // 4
System.out.println(absoluteAdd(9, 4)); // 13

public static int absoluteAdd(int a, int b) {
    return Math.abs(a) + Math.abs(b);
}

• Problem 2: What will get printed onto the console? No IDE!

public class NestedMysteryCode {
    public static void main(String[] args) {
        nestedMysteryCode(5, 10, 3);
        nestedMysteryCode(7, 2, 7);
        nestedMysteryCode(4, 4, 4);
    }

    public static void nestedMysteryCode(int a, int b, int c) {
        if (a > b) {
            if (b < c) {
                System.out.println("Case 1");
            } else {
                System.out.println("Case 2");
            }
        } else if (a < b) {
            if (b > c) {
                if (c != 0) {
                    System.out.println("Case 3");
                } else {
                    System.out.println("Case 4");
                }
            } else if (b == c) {
                if (a >= 0) {
                    System.out.println("Case 5");
                } else {
                    System.out.println("Case 6");
                }
            } else {
                System.out.println("Case 7");
            }
        } else {
            if (b == c) {
                System.out.println("Case 8");
            } else if (b > c) {
                if (a % 2 == 0) {
                    System.out.println("Case 9");
                } else {
                    System.out.println("Case 10");
                }
            } else {
                if (c > 0) {
                    System.out.println("Case 11");
                } else {
                    System.out.println("Case 12");
                }
            }
        }
    }
}

Case 3
Case 1
Case 8

• Problem 3: Create a method that takes 2 integers, print out the numbers from the first number to the second number changing by a count of 1.
  • Don’t worry about how the output looks. As long as the numbers are printed in the right order.

countingByOne(10, 5); // 10, 9, 8, 7, 6, 5
countingByOne(12, 19); // 12, 13, 14, 15, 16, 17, 18, 19
countingByOne(1, 1); // 1

public static void countingByOne(int a, int b) {
    if (a > b) {
        for (int i = a; i > b; i--) {
            System.out.print(i + ", ");
        }
        System.out.println(b);
    } else {
        for (int i = a; i < b; i++) {
            System.out.print(i + ", ");
        }
        System.out.println(b);
    }
}