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In C++, 0 means false and 1 means true.
(In C, 0 means false and non-zero means true.)
A predicate is a function that returns 0 or 1 (a bool function)
The ! operator means not;The ! operator converts 0 into 1 and any integer
other than 0 into a 0.
If you want to force the conversion of a value from one type into the
corresponding value of another type, then you must cast the value in the
following way:
(type) expression;
(double) 14;
If you want to compare two numbers of different types, then you must cast
one to match the type of the other.
If you want to tell C++ that you intend to work with an input or output
stream, then include the following in your header.
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