# V691. Empirical analysis. Possible typo inside the string literal. The 'foo' word is suspicious.

Whenever the analyzer detects two identical string literals, it will try to figure out if it is a consequence of poor Copy-Paste. We want to warn you right away that this diagnostic is based on an empirical algorithm and therefore may produce strange false positives sometimes.

Take a look at the following example:

    static const wchar_t left_str[] = L"Direction: left.";
    static const wchar_t right_str[] = L"Direction: right.";
    static const wchar_t up_str[] = L"Direction: up.";
    static const wchar_t down_str[] = L"Direction: up.";

The code was written with the help of the Copy-Paste method. The programmer forgot to replace the string literal "up" with "down" at the end of the block. The analyzer will suspect something is wrong and point out the strange word "up" in the last line.

The fixed code:

    static const wchar_t left_str[] = L"Direction: left.";
    static const wchar_t right_str[] = L"Direction: right.";
    static const wchar_t up_str[] = L"Direction: up.";
    static const wchar_t down_str[] = L"Direction: down.";;

You can look at examples of errors detected by the V691 diagnostic.