Character-string operations

• atom_length(Atom,Length) Length (in characters) of Atom is Length.

• atom_concat(Atom1,Atom2,Atom3) The concatenation of Atom1 and Atom2 is equal to Atom3. Either both Atom1 and Atom2 are atoms or Atom3 is an atom.

• sub_atom(Atom,N,L,Sub) The substring of Atom beginning at the Nth character and L characters long is Sub. The index of the first character is 0.

• char_code(Char,Code) The numeric code of the character Char is Code.

• atom_chars(Atom,Chars) Chars is the list of characters of Atom.

• atom_codes(Atom,Codes) Codes is the list of numeric codes of the characters of Atom.

• number_chars(Num,Chars) Chars is the list of digits (including '.') of the number Num.

• number_codes(Num,Codes) Codes is the list of numeric codes of digits of the number Num.