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5.13. Code Practice with Conditionals

The following code should print X is greater than 0. However, the code has errors. Fix the code so that it compiles and runs correctly.

public class Test1 { public static void main(String[] args) { int x = 3; if (x > 0 System.out.println("x is greater than 0") else System.out.println(x is less than or equal 0"); } }

Line 6 is missing a final ). Line 7 is missing a semicolon at the end. Line 9 is missing the starting ".

public class Test1 { public static void main(String[] args) { int x = 3; if (x > 0) System.out.println("x is greater than 0"); else System.out.println("x is less than or equal 0"); } }

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The following code should check your guess against the answer and print that it is too low, correct, or too high. However, the code has errors. Fix the code so that it compiles and runs correctly.

public class Test1 { public static void main(String[] args) { int guess = 7; int answer = 9; if guess < answer) System.out.println("Your guess is too low); else if (guess = answer) System.out.println("You are right!"); else System.println("Your guess is too high"); } }

Line 7 is missing the starting (. Line 8 is missing the closing ". Line 9 should be == rather than = to test for equality. Line 12 should be System.out.println.

public class Test1 { public static void main(String[] args) { int guess = 7; int answer = 9; 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"); } }

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The following code should print if you can go out or not. You can go out if you have done your homework and cleaned your room. However, the code has errors. Fix the code so that it compiles and runs correctly.

public class Test1 { public static void main(String[] args) { boolean doneHomework = True; boolean cleanedRoom = true; if (doneHomework && cleanedRoom) System.out.println("You can not go out"); else System.out.println("You can go out"); } }

Line 5 should be true not True. Lines 10 and 8 should be swapped.

public class Test1 { public static void main(String[] args) { boolean doneHomework = true; boolean cleanedRoom = true; if (doneHomework && cleanedRoom) System.out.println("You can go out"); else System.out.println("You can not go out"); } }

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The following code should print if x is in the range of 0 to 10 (including 0 and 10). However, the code has errors. Fix the errors so that the code runs as intended.

public class Test1 { public static void main(String[] args) { int x = 3 if (x > 0 && x <= 10) System.out.println("x is between 0 and 10 inclusive"); otherwise System.out.println("x is either less than 0 or greater than 10"); } }

Line 5 is missing an end ;. Line 6 should be x >= 0. Line 8 should be else instead of otherwise.

public class Test1 { public static void main(String[] args) { int x = 3; if (x >= 0 && x <= 10) System.out.println("x is between 0 and 10 inclusive"); else System.out.println("x is either less than 0 or greater than 10"); } }

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The following code should print if x is less than 0, equal to 0, or greater than 0. Finish it to work correctly.

public class Test1 { public static void main(String[] args) { int x = -3; if (x > 0) System.out.prinln("x is less than 0"); } }

One way to solve this is to add an else if and then print out if x is equal to 0 and an else to print that x is greater than 0 as shown below.

public class Test1 { public static void main(String[] args) { int x = -3; if (x < 0) System.out.println("x is less than 0"); else if (x == 0) System.out.println("x is equal to 0"); else System.out.println("x is greater than 0"); } }

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Finish the code below so that it prints You can go out if you have a ride or if you can walk and otherwise prints You can't go out. Use a logical or to create a complex conditional.

public class Test1 { public static void main(String[] args) { boolean canWalk = true; boolean haveRide = false; } }

Add an if statement and use a logical or (||) to join the conditions and print the one message. Also add an else statement and print the other message.

public class Test1 { public static void main(String[] args) { boolean canWalk = true; boolean haveRide = false; if (canWalk || haveRide) System.out.println("You can go out"); else System.out.println("You can't go out"); } }

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Finish the code below to print you can go out if you don’t have homework and you have done the dishes.

public class Test1 { public static void main(String[] args) { boolean haveHomework = false; boolean didDishes = true; } }

Add a conditional with a negation ! for haveHomework and a logical and to create a complex conditional.

public class Test1 { public static void main(String[] args) { boolean haveHomework = false; boolean didDishes = true; if (!haveHomework && didDishes) System.out.println("You can go out"); else System.out.println("You can't go out"); } }

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Finish the following code so that it prints You have a fever if your temperature is above 100 and otherwise prints You don't have a fever.

public class Test1 { public static void main(String[] args) { double temp = 103.5; } }

Add a conditional and print the first message if the temp is above 100 and otherwise print the other message.

public class Test1 { public static void main(String[] args) { double temp = 103.5; if (temp > 100) System.out.println("You have a fever"); else System.out.println("You don't have a fever"); } }

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Finish the code to print It is freezing if the temperature is below 30, It is cold if it is below 50, It is nice out if it is below 90, or It is hot.

public class Test1 { public static void main(String[] args) { int temp = 100; } }

Add a conditional with two else if statements and a final else.

public class Test1 { public static void main(String[] args) { int temp = 100; if (temp < 30) System.out.println("It is freezing"); else if (temp < 50) System.out.println("It is cold"); else if (temp < 90) System.out.println("It is nice out"); else System.out.println("It is hot"); } }

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Finish the code below to print your grade based on your score. The score is an A if you scored 92 or higher, a B if you scored 82 to 91, a C if you scored 72 to 81, a D if you scored a 62 to 71, or an E.

public class Test1 { public static void main(String[] args) { double score = 67; } }

Add a conditional with three else if statements and a final else.

public class Test1 { public static void main(String[] args) { double score = 67; if (score >= 92) System.out.println("A"); else if (score >= 82) System.out.println("B"); else if (score >= 72) System.out.println("C"); else if (score >= 62) System.out.println("D"); else System.out.println("E"); } }

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