Fixing Common Errors

Learning Objectives Identify the difference between a syntax error and a logic error. Trace a loop with a variable to find an infinite loop error. Correct an 'off-by-one' error in a loop. Fix a complex conditional statement that uses the wrong comparison operator. Use 'print' statements as a simple debugging tool to check variable values. Explain how to methodically test code to find a bug. Have you ever built something awesome with blocks, only for it to fall down because one piece was in the wrong spot? 🐛 Let's learn how to find those wobbly blocks in our code! In this lesson, we will become code detectives! We'll learn about common mistakes that happen in more advanced programs, like loops that never end and conditions that don't work...

TermDefinitionExample BugAn error or mistake in a computer program that causes it to produce an incorrect or unexpected result.In a game, you collect 10 coins but the score only shows 9. The mistake in the code that caused this is a bug. DebuggingThe process of finding and fixing bugs in a program. It's like being a detective for your code.Adding a print command to see the value of your 'score' variable to figure out why it's not counting correctly. Logic ErrorA bug where the code runs without crashing, but it doesn't do what you intended it to do. The computer follows your instructions perfectly, but the instructions are wrong.You want a spaceship to move up when you press the up arrow, but you accidentally coded it to move down. The program runs, but the logic i...

The Print Check print(variable_name) When you're not sure what value a variable holds at a certain point in your program, add a print statement. This will display the variable's value in the output, helping you see exactly what the computer is thinking. The Manual Trace Read code line-by-line, pretending you are the computer. Use a piece of paper to keep track of how variable values change. This is a powerful way to find logic errors. By manually tracing the flow of your program, especially through loops and conditionals, you can often spot where your logic went wrong before the computer does. Check Your Condition Is it `>` or `>=`? Is it `<` or `<=`? Is it `==` or `=`? Always double-check the comparison operators in your `if` statements and `wh...