Update grammar

fc3cc724 · Esteban Prince, Liam (UG - Computer Science) · 576b2a2a · fc3cc724
Commit fc3cc724 authored 5 years ago by Esteban Prince, Liam (UG - Computer Science)
--- a/grammar
+++ b/grammar
@@ -4,7 +4,7 @@
 Amount ::= Digit+ ("-" | "/" | "to")? Digit*

 /* Digit: */
-Digit ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
+Digit ::= ("0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9")+

 /* Unit: unit of measure */
 /* recognises synonyms or shorthand */