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Computer Science: Elementary School: Grades 3, 4 and 5 Quiz - Debugging (Questions)

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Writing algorithms is fun. Writing code is fun. When you have written all the code, you have a program. Then you try out the program. This is called executing the program. But does the program work? What if there are bugs in the program? A bug is a mistake. Often bugs are there because the codes are in the wrong order. So then you have to go through all the code to find the mistake. This is called the debugging cycle. It is a bit like a detective puzzle.

What is a mistake in a program called?

[ ]	A code
[ ]	A bit
[ ]	A byte
[ ]	A bug

Ellie is trying out a program. She is _______ it.

[ ]	Writing
[ ]	Spelling
[ ]	Testing
[ ]	Adding

Ellie’s program does not work. So Ellie looks for the bug and puts it right. Ellie is _________ the program.

[ ]	Debugging
[ ]	Executing
[ ]	Running
[ ]	Testing

Ellie thinks she has found a bug in her program. The program is to make a toy robot stop when it gets to a wall. This is the bug:

Forward
Wall?
Yes - Forward
No - Stop

Ellie corrects the code. What does she write?

[ ]	Forward Wall? Yes - Back No - Stop
[ ]	Forward Wall? Yes - Forward No - Back
[ ]	Forward Wall? Yes - Stop No - Forward
[ ]	Forward Wall? Yes - Back No - Forward

What will happen if there is a bug in Ellie’s program?

[ ]	The program will work properly
[ ]	The program will not work properly
[ ]	The program will work all the time
[ ]	The program will be great

Ellie debugs her program. It works really well all the time now. Ellie’s program is a _______.

[ ]	Failure
[ ]	Success
[ ]	Mess
[ ]	Disaster

Sunil has written a program for a washing machine. The washing machine must wash, rinse and spin in that order. He writes a code:

Rinse Wash Spin

His program does not work properly. What should Sunil write?

[ ]	Spin Rinse Wash
[ ]	Wash Spin Rinse
[ ]	Rinse Wash Spin
[ ]	Wash Rinse Spin

Alice has a program to make a computer do sums. There are three codes she can use:

ADD
SUBTRACT
SHOW

Alice wants the computer to add two numbers and show the result. Alice writes:

ADD SUBTRACT SHOW

There is a bug in Alice’s code. What should she write?

[ ]	SUBTRACT SHOW
[ ]	SHOW ADD
[ ]	SHOW SUBTRACT
[ ]	ADD SHOW

Freddy is designing toy traffic lights. He programs a toy car to stop when the lights are red and go when the lights are green. He writes this program:

Go
If Red, Go
If Green, Go

Freddy tests his program. But the car does not stop at a red light. Can you help Freddy debug his program? What should Freddy code?

[ ]	Stop - If Red, Go - If Green, Go
[ ]	Stop - If Red, Stop - If Green, Stop
[ ]	Go - If Red, Stop - If Green, Go
[ ]	Go - If Red, Stop - If Green, Stop

10.

Programs are written. Then they are tested. Any bugs are put right. Then they are tested again until they are working properly. This is called the _________ cycle.

[ ]	Cycling
[ ]	Debugging
[ ]	Yearly
[ ]	Round

Computer Science: Elementary School: Grades 3, 4 and 5 Quiz - Debugging (Answers)

What is a mistake in a program called?

[ ]	A code
[ ]	A bit
[ ]	A byte
[x]	A bug

We all make mistakes! There are often bugs in computer programs first time round

Ellie is trying out a program. She is _______ it.

[ ]	Writing
[ ]	Spelling
[x]	Testing
[ ]	Adding

Ellie is running or executing the program

Ellie’s program does not work. So Ellie looks for the bug and puts it right. Ellie is _________ the program.

[x]	Debugging
[ ]	Executing
[ ]	Running
[ ]	Testing

There might be more than one bug in Ellie’s program

[ ]	Forward Wall? Yes - Back No - Stop
[ ]	Forward Wall? Yes - Forward No - Back
[x]	Forward Wall? Yes - Stop No - Forward
[ ]	Forward Wall? Yes - Back No - Forward

Ellie then tests her program again

What will happen if there is a bug in Ellie’s program?

[ ]	The program will work properly
[x]	The program will not work properly
[ ]	The program will work all the time
[ ]	The program will be great

There are often lots of bugs in a program

Ellie debugs her program. It works really well all the time now. Ellie’s program is a _______.

[ ]	Failure
[x]	Success
[ ]	Mess
[ ]	Disaster

Ellie has done really well

[ ]	Spin Rinse Wash
[ ]	Wash Spin Rinse
[ ]	Rinse Wash Spin
[x]	Wash Rinse Spin

You need to wash the clothes before you rinse them

[ ]	SUBTRACT SHOW
[ ]	SHOW ADD
[ ]	SHOW SUBTRACT
[x]	ADD SHOW

What should Alice write to take away one number from another number and show the result?

[ ]	Stop - If Red, Go - If Green, Go
[ ]	Stop - If Red, Stop - If Green, Stop
[x]	Go - If Red, Stop - If Green, Go
[ ]	Go - If Red, Stop - If Green, Stop

The car has to stop at the red light, and only go when it is green

10.

Programs are written. Then they are tested. Any bugs are put right. Then they are tested again until they are working properly. This is called the _________ cycle.

[ ]	Cycling
[x]	Debugging
[ ]	Yearly
[ ]	Round

Debugging programs is very important