Programming Logic Quiz

Given the following code, what result will be stored in the boolean variable? int numRabbits = 5; bool enoughRabbits = numRabbits > 2 && numRabbits < 7;

• true

• false

• null

• Impossible to tell

When the following code runs, under what conditions will the "Access granted" message be displayed? string password = "secret"; Console.Write("Enter password: "); string input = Console.ReadLine(); if (input == password || input == "override") { Console.WriteLine("Access granted"); }

• input is equal to "secret" OR input is equal to "override"

• input is equal to "secret" AND input is equal to "override"

• input is equal to "secret" only

• input is equal to "override" only

What expression should replace the ???? below to print the output message if the number of people is less than 5 or greater than 10? Console.Write("How many people are here? "); int people = int.Parse(Console.ReadLine()); if ( ???? ) { Console.WriteLine("Not the right size group"); }

• (people < 5) || (people > 10)

• (people <= 5) && (people >= 10)

• (people < 5 && > 10)

• (5 < people < 10)

What expression should replace the ???? below to ensure the message is printed only if there is exactly one winner? Console.Write("Did player 1 win? "); bool winner1 = bool.Parse(Console.ReadLine()); Console.Write("Did player 2 win? "); bool winner2 = bool.Parse(Console.ReadLine()); if (????) { Console.WriteLine("There can only be 1 winner"); }

• winner1 ^ winner2

• winner1 && winner2

• winner1 || winner2

• winner1 ! winner2

What expression should replace the ???? below to ensure the message is printed only if neither winner is true? Console.Write("Did player 1 win? "); bool winner1 = bool.Parse(Console.ReadLine()); Console.Write("Did player 2 win? "); bool winner2 = bool.Parse(Console.ReadLine()); if (????) { Console.WriteLine("There is no winner"); }

• (!winner1) && (!winner2)

• (winner1 && winner2)

• (winner1 ^ winner2)

• (winner1 || winner2

Which single if() expression can replace the nested if() statements below to ensure the message is still printed under the same conditions? Assume age is a properly initialized int variable and passedDriverTest is a properly initialized bool variable. if (age >= 16) { if (!passedDriverTest) { Console.WriteLine("Old enough, but still can't drive"); } }

• if ( (age >= 16) && (!passedDriverTest) )

• if ( (age >= 16) || (passedDriverTest) )

• if ( age && !passedDriverTest )

• if ( age && (passedDriverTest >= 16) )

Which logical operator works against a single input Boolean value or expression?

• !

• &&

• ||

• ^

If A is a Boolean and B is an integer, according to precedence rules, which operation will happen first in the following expression? bool result = 10 < B + 5 && !A

• IA

• 10 < B

• B + 5

• 5 && !A

If A is a Boolean and B is an integer, according to precedence rules, which operation will happen first in the following expression? bool result = (10 < (B + 5)) && A

• B + 5

• 10 <

• && A

• Impossible to tell

If A, B and C are all Boolean values, how can you add parentheses to the expression to change the final result? bool result = A && B && C;

• No parentheses will change the result in this case

• (A && B) && C

• A && (B && C)

• (A && B && C)