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Answers you can run
The errors and how-tos people search for, answered plainly. Every example on these pages runs in your browser on the same engines as our free compilers, and every one was run before the post went live.
- CArray index out of bounds in C: find the line that does itC lets you read past the end of an array without a word. Here is why, what the bug looks like, and how to make the compiler name the exact line.
- SQLColumn must appear in the GROUP BY clause: what SQL is askingWhy SQL refuses a column that is neither grouped nor aggregated, the three ways to fix it, and the one that changes your answer. Run every query here.
- PythonIndexError: list index out of range in Python, and how to fix itWhat Python's most common list error means, the four mistakes that cause it, and the fix for each, with examples you can run in your browser.