4.9. Mixed Up Code Practice¶

Try to solve each of the following. Click the Check Me button to check each solution. You will be told if your solution is too short, has a block in the wrong order, or you are using the wrong block. Some of the problems have an extra block or two that aren’t needed in the correct solution. Try to solve these on your phone or other mobile device!

The following program segment should print if your guess is too low, correct, or too high But, the blocks have been mixed up. Drag the blocks from the left and put them in the correct order on the right. Click the Check button to check your solution.

        int guess = 10;
int answer = 5;
---
if (guess < answer)
---
{
    System.out.println("Your guess is too low");
}
---
else if (guess == answer)
---
{
    System.out.println("You are right!");
}
---
else
---
{
     System.out.println("Your guess is too high");
}

The following program segment should print either “You can go out” if you don’t have any homework and have cleaned and otherwise should print “You can not go out”. But the blocks have been mixed up and includes one extra block that is not needed in a correct solution. Drag the needed blocks from the left and put them in the correct order on the right. Click the Check button to check your solution.

        public class Test1
{
---
    public static void main(String[] args)
    {
---
        boolean homeworkLeft = false;
        boolean cleaned = true;
---
        if (!homeworkLeft && cleaned)
---
        if (homeworkLeft && cleaned) #paired
---
        {
            System.out.println("You can go out");
        }
---
        else
---
        {
            System.out.println("You can not go out");
        }
---
    }
}

The main method in the following class should print if x is in the range of 1 to 10 (inclusive) or not. But, the blocks have been mixed up and includes an extra block that isn’t needed in the solution. Drag the needed blocks from the left and put them in the correct order on the right. Click the Check button to check your solution.

        public class Test1
{
---
    public static void main(String[] args)
    {
---
        int x = 3;
---
        if (x >= 1 && x <= 10)
---
        if (x >= 1 || x <= 10) #paired
---
        {
            System.out.println("1 <= x <= 10");
        }
---
        else
---
        {
            System.out.println("x is not in range");
        }
---
    }
}

The main method in the following class should print out if a string has the word “ringing” in it or not. But, the blocks have been mixed up and includes an extra block that isn’t needed in the solution. Drag the needed blocks from the left and put them in the correct order on the right. Click the Check button to check your solution.

        public class Test1
{
---
    public static void main(String[] args)
    {
---
       String message = "Is that the phone ringing?";
---
       if (message.indexOf("ringing") >= 0)
---
       if (message.indexof("ringing") >= 0) #paired
---
       {
           System.out.println("Answer the phone!");
       }
---
       else
---
       {
           System.out.println("I don't hear anything.");
       }
---
    }
}

The main method in the following class should print if your favorite food is junk food (pizza or wings) or not. But, the blocks have been mixed up and includes an extra block that is not needed in a correct solution. Drag the needed blocks from the left and put them in the correct order on the right. Click the Check button to check your solution.

        public class Test1
{
    public static void main(String[] args)
    {
---
        String favFood = "kale";
        boolean favPizza = favFood.equals("pizza");
        boolean favWings = favFood.equals("wings");
---
        if (favPizza || favWings)
---
        if (favPizza && favWings) #paired
---
        {
            System.out.println("Your fav is junk food");
        }
---
        else
---
        {
            System.out.println("Your fav is not junk");
        }
---
    }
}

The main method in the following class should print your fine if you are speeding. If you are going over 65 but less than 75 the fine is 50. If you are going at least 75 and less than 85 the fine is 100. Over that the fine is 200. It does not print anything if you are not speeding. But, the blocks have been mixed up and includes two extra blocks that aren’t needed in the solution. Drag the needed blocks from the left and put them in the correct order on the right. Click the Check button to check your solution.

        public class Test1
{
    public static void main(String[] args)
    {
---
        int speed = 90;
---
        if (speed > 65 && speed < 75)
---
        if (speed > 65 || speed < 75) #paired
---
        {
            System.out.println("50");
        }
---
        else if (speed >= 75 && speed < 85)
---
        else if (speed >= 75 || speed < 85) #paired
---
        {
            System.out.println("100");
        }
---
        else if (speed >= 85)
        {
            System.out.println("200");
        }
---
    }
}

The main method in the following class should print the alarm time. If it is a weekday you should get up at 7:00am and if not get up at 10:00am. But, the blocks have been mixed up. Drag the needed blocks from the left and put them in the correct order on the right. Click the Check button to check your solution.

        public class Test1
{
---
    public static void main(String[] args)
    {
---
        boolean weekend = false;
---
        if (!weekend)
---
        {
            System.out.println("7:00am");
        }
---
        else
---
        {
            System.out.println("10:00am");
        }
---
    }
}

The main method in the following class should print if you can text now. You can text if you are not driving and not eating. But, the blocks have been mixed up and includes an extra block that isn’t needed in the solution. Drag the needed blocks from the left and put them in the correct order on the right. Click the Check button to check your solution.

        public class Test1
{
---
    public static void main(String[] args)
    {
---
        boolean driving = true;
        boolean eating = false;
---
        if (!driving && !eating)
---
        if (!driving || !eating) #paired
---
        {
            System.out.println("Can text now");
        }
---
        else
---
        {
            System.out.println("Can't text now");
        }
---
    }
}

The main method in the following class should print if your name starts with a vowel or not. But, the blocks have been mixed up. Drag the blocks from the left and put them in the correct order on the right. Click the Check button to check your solution.

        public class Test1
{
---
    public static void main(String[] args)
    {
---
        String name = "Julian";
        String firstLetter = name.substring(0,1);
        String lowerFirst = firstLetter.toLowerCase();
---
        boolean aF = lowerFirst.equals("a");
        boolean eF = lowerFirst.equals("e");
        boolean iF = lowerFirst.equals("i");
        boolean oF = lowerFirst.equals("o");
        boolean uF = lowerFirst.equals("u");

---
        if (aF || eF || iF || oF || uF)
---
        {
            System.out.println("Starts with a vowel");
        }
---
        else
---
        {
            System.out.println("Starts with a consonant");
        }
---
    }
}

The main method in the following class should print your grade for score. But, the blocks have been mixed up. Drag the needed blocks from the left and put them in the correct order on the right. Click the Check button to check your solution.

        public class Test1
{
    public static void main(String[] args)
    {
---
        int score = 73;
---
        if (score >= 90)
---
        {
            System.out.println("A");
        }
---
        else if (score >= 80)
---
        {
            System.out.println("B");
        }
---
        else if (score >= 70)
        {
            System.out.println("C");
        }
---
        else if (score >= 60)
        {
            System.out.println("D");
        }
---
        else
        {
            System.out.println("E");
        }
---
    }
}

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4.9. Mixed Up Code Practice¶