Subroutines - Comprehension

What is the main difference between a function and a procedure?

• A function uses parameters, a procedure does not
• A function can contain loops, a procedure cannot
• A function returns a value, a procedure does not
• A procedure is always called from within a loop

Answer explanation

Functions return values; procedures do not.

Which of the following is a benefit of using subroutines in a program?

• Subroutines make the program run faster
• Subroutines reduce the size of the compiler
• Subroutines help reduce repetition and make code easier to maintain
• Subroutines automatically test your code

Answer explanation

Subroutines help with readability, reuse, and maintenance.

Which of the following is true about local variables?

• They are declared outside all subroutines
• They can be used in any part of the program
• They are shared between all subroutines
• They only exist while the subroutine runs

Answer explanation

Local variables exist only during subroutine execution.

How many parameters are passed into the subroutine giveChange?

• 0
• 1
• 2
• Cannot be determined

Answer explanation

Only the result of the calculation is passed, so 1 parameter.

What is the name of the subroutine?

• def
• calculateArea
• length
• return

Answer explanation

The name of the subroutine is the identifier after 'def'.

In this subroutine, which of the following are the parameters?

• greet
• print
• name and timeOfDay
• “Good”, “timeOfDay”, “name”

Answer explanation

Parameters are listed in the subroutine definition.

Which of these is an argument in the following subroutine call?

• displayScore
• 'Player 1' and 42
• score
• None of the above

Answer explanation

Arguments are the actual values passed to the subroutine.

What is the purpose of a return statement in a function?

• It stops the program from crashing
• It displays text on screen
• It sends a value back to the part of the program that called the function
• It saves data to a file

Answer explanation

Return sends data back to the calling part of the program.

Look at the subroutine definition and call. Which of the following is correct?

• name and yearGroup are arguments; 'Hannah' and 11 are parameters
• welcomeMessage is the only parameter
• name and yearGroup are parameters; 'Hannah' and 11 are arguments
• All are arguments

Answer explanation

Parameters are in the definition; arguments are in the call.

A subroutine that returns a value is called a ____