This Computer Science quiz is called 'Debugging' and it has been written by teachers to help you if you are studying the subject at elementary school. Playing educational quizzes is an enjoyable way to learn if you are in the 3rd, 4th or 5th grade - aged 8 to 11.
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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.