inancgumus/learngo · error

wrong input: %q (line #%d)

Error message

wrong input: %q (line #%d)

What it means

parse() rejects the visits column when strconv.Atoi cannot convert it or the value is negative. The offending token is quoted with %q and p.lines pinpoints the line in the log; the parser (passed by value in this exercise) returns the error to main, which stops the run.

Source

Thrown at 25-functions/04-pass-by-value-semantics/parser.go:49

	parsed.domain = fields[0]

	parsed.visits, err = strconv.Atoi(fields[1])
	if parsed.visits < 0 || err != nil {
		err = fmt.Errorf("wrong input: %q (line #%d)", fields[1], p.lines)
		return
	}

View on GitHub (pinned to 3c475a78e5)

Solutions

1. Pre-validate that the visits field parses as a non-negative integer.
2. Skip invalid lines and keep processing the rest of the log.
3. Repair the input data so visits are non-negative integers.

When it happens

Trigger: Thrown at 25-functions/04-pass-by-value-semantics/parser.go:49 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of inancgumus/learngo@3c475a78e5 (2026-09-02). Data as JSON: /api/errors/de228f0e33db57a5. Report an issue: GitHub.