1. The Moscow ML distribution contains some examples illustrating the use of mosmllex and mosmlyacc. See for example the directories calc and lexyacc under mosml/examples.
2. Programs for the lecture:
   • Absyn.sml: Abstract syntax for a simple expression language, including an evaluation function.
   • Exprlex.lex: Input to mosmllex.
   • Exprpar.grm: Input to mosmlyacc.
   • parse.sml: File containing functions to parse expressions. You do not have to change this file solving the exercises. You only have to use the function parses: string -> expr (parses an expression from a string) and the function parsef: string -> expr, which parses an expressions from a file.
   • You can see how to compile the above files here.