Uses exact equality on floats.

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C Translation (author inactive).

All border cases should be tested, 2, 4, 8 and 10 litres in fixed tests in all languages.

Yet another caesar cipher kata

The random testing doesn't include test(s) for liter values below 2 :)

Please fix it for C++ (warning from test code, not mine):

main.cpp:53:30: warning: comparison of integers of different signs: 'int' and 'std::__cxx11::basic_string<char, std::char_traits, std::allocator >::size_type' (aka 'unsigned long') [-Wsign-compare]
for(int i = 0; i < str.size(); i++)
~ ^ ~~~~~~~~~~
1 warning generated.

FYI, both the description text and the initial solution parameters (Java) have inconsistent spellings of litre versus liter.