Convert a string to an integer
Integer_Type integer (String_Type s)
The integer function converts a string representation of an
integer back to an integer. If the string does not form a valid
integer, a type-mismatch error will be generated.
integer ("1234") returns the integer value 1234.
This function operates only on strings and is not the same as the
more general typecast operator.
typecast, _slang_guess_type, string, sprintf, char