[NEW] Parse numbers of any length, instead of only one digit.

compiler.rb

@@ -89,9 +89,12 @@ class Compiler
   # Get a number.
   def get_num
     expected('integer') unless digit?(@look)
-    c = @look
-    get_char
-    return c
+    value = ''
+    while digit?(@look)
+      value << @look
+      get_char
+    end
+    value
   end
 
   # Define a constant in the .data section.

test.rb

@@ -25,7 +25,7 @@ def main(arg)
             File.open(arg)
           else
             # StringIO.new("5*(3-5)*2+2-9/3-8/2-4*(5+5+5)\n")
-            StringIO.new("abc=9\nabc-9\n")
+            StringIO.new("abc=999\nabc-888\n")
           end
   data, bss, code = *parse(input)
   template = File.read("template.asm")