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Debugging
Mistakes in programs are called bugs - but they are not bugs like this one!

Debugging

This quiz addresses part of the requirements of the National Curriculum KS1 for children aged 5 and 6 in years 1 and 2 in Computing. Specifically it looks at executing a simple program, bugs and the debugging cycle. It is one of 20 quizzes to help you find out about how computers work, and how they affect all our lives.

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.

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1.
Ellie is trying out a program. She is _______ it.
Writing
Spelling
Testing
Adding
Ellie is running or executing the program
2.
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
What should Alice write to take away one number from another number and show the result?
3.
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
You need to wash the clothes before you rinse them
4.
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
There are often lots of bugs in a program
5.
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
The car has to stop at the red light, and only go when it is green
6.
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
Debugging programs is very important
7.
Ellie debugs her program. It works really well all the time now. Ellie’s program is a _______.
Failure
Success
Mess
Disaster
Ellie has done really well
8.
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
Ellie then tests her program again
9.
Ellie’s program does not work. So Ellie looks for the bug and puts it right. Ellie is _________ the program.
Debugging
Executing
Running
Testing
There might be more than one bug in Ellie’s programme
10.
What is a mistake in a program called?
A code
A bit
A byte
A bug
We all make mistakes! There are often bugs in computer programs first time round
Author:  David Bland

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