I have a string called in, a string that has the value of Hello, world!. I also have a integer called i that has the value -1. When I ask C++ to print out if i is less than the length of in (in.length()), it says false but when I try -1 < 15, it says true. Why does it say false? I feel like this is extremely basic math?
C++ is saying that -1 < 13 (in programming) is false
Ceyhun
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1 Answers
string::length() returns an unsigned integer. You can't compare that to a negative signed value, so the -1 gets converted to an unsigned value, which wraps it to a very large number, which is not less than the string's length, hence the result is false.
-1 < 15, on the other hand, is comparing two signed integers, so no conversion is needed, and the result is true, as expected.
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