Initial data commit

Task/Arithmetic-evaluation/F-Sharp/arithmetic-evaluation-3.fs

@@ -0,0 +1,26 @@
+%{
+open AbstractSyntaxTree
+%}
+
+%start Expr
+
+// terminal tokens
+%token <int> INT
+%token PLUS MINUS TIMES DIVIDE LPAREN RPAREN
+%token EOF
+
+// associativity and precedences
+%left PLUS MINUS
+%left TIMES DIVIDE
+
+// return type of Expr
+%type <Expression> Expr
+
+%%
+
+Expr: INT                     { Int $1 }
+    | Expr PLUS Expr          { Plus ($1, $3) }
+    | Expr MINUS Expr         { Minus ($1, $3) }
+    | Expr TIMES Expr         { Times ($1, $3) }
+    | Expr DIVIDE Expr        { Divide ($1, $3) }
+    | LPAREN Expr RPAREN      { $2 }