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KwickClips Java · 38 sec · free

Why does 40 + 50 / 2 give 65?

Short answer. Division runs first, so it is 40 + 25.

How do you find a logical error?

Test with inputs whose answers you already know.

Remember

Logical error: wrong output
Test with answers you know

No error message, but the answer is wrong. Why? Division happens before addition. So avg is sixty five, not forty five. Brackets fix it. Logical errors give wrong output. Test with answers you know.

This clip is from the full lesson: Errors in Java Programs: Syntax, Run-time and Logical — 7 minutes, with the tables, the quick answers and the whole lesson in text.

Useful for: ICSE Class 9 Computer Applications

More KwickClips from this lesson

A code line without its semicolon and the compiler message semicolon expected.Who catches a syntax error?39 secCode dividing 30 by a groups variable of 0, and the ArithmeticException slash by zero message.Why did a program with no compile error still crash?39 secA loop with i < 5 printing sum 10, and the corrected i <= 5 printing 15.Why did the loop stop at 4?37 sec
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