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[bool] ispunct([int] char)
char is the character, given in 16 bit Unicode.
ispunct() returns TRUE if char is a punctuation mark. Otherwise it returns FALSE.
// Outputs "ispunct(5) = 0
// ispunct(a) = 0
// ispunct( ) = 0
// ispunct(!) = 1".
println("ispunct(5) = ",ispunct("5"[0]));
println("ispunct(a) = ",ispunct("a"[0]));
println("ispunct( ) = ",ispunct(" "[0]));
println("ispunct(!) = ",ispunct("!"[0]));