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