Can I use the not operator in C++ on int values?

Question

Strange question, but someone showed me this, I was wondering can you use the not ! operator for int in C++? (its strange to me).

#include 
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Answer 1

The build-in ! operator converts its argument to bool. The standard specifies that there exists a conversion from any arithmetic type(int, char,.... float, double...) to bool. If the source value is 0 the result is true, otherwise it is false