diff --git a/jlc/Makefile b/jlc/Makefile
new file mode 100644
index 0000000..2452652
--- /dev/null
+++ b/jlc/Makefile
@@ -0,0 +1,17 @@
+
+FLEX := flex
+BISON := bison
+
+all: jlc
+
+jlc: lex.yy.c jl.tab.c
+	$(CC) -o $@ $^
+
+jl.tab.c jl.tab.h: jl.y
+	$(BISON) -d $<
+
+lex.yy.c: jl.lex
+	$(FLEX) $<
+
+clean:
+	-rm -f lex.yy.c jl.tab.c jl.tab.h *~ *.o jlc
diff --git a/jlc/jl.lex b/jlc/jl.lex
new file mode 100644
index 0000000..cd4d964
--- /dev/null
+++ b/jlc/jl.lex
@@ -0,0 +1,13 @@
+
+%{
+#include "jl.tab.h"
+%}
+
+%%
+0b[01]+             return BIN_NUMBER;
+0x[0-9A-Fa-f]       return HEX_NUMBER;
+0[0-9]*             return OCT_NUMBER;
+[1-9][0-9]*         return DEC_NUMBER;
+\n                  /* ignore newlines */
+[ \t\v]             /* ignore whitespace */
+%%
diff --git a/jlc/jl.y b/jlc/jl.y
new file mode 100644
index 0000000..54ee106
--- /dev/null
+++ b/jlc/jl.y
@@ -0,0 +1,33 @@
+
+%{
+#include <stdio.h>
+
+void yyerror(const char * str)
+{
+    fprintf(stderr, "error: %s\n", str);
+}
+
+int yywrap()
+{
+    return 1;
+}
+
+main()
+{
+    yyparse();
+}
+
+%}
+
+%token BIN_NUMBER OCT_NUMBER DEC_NUMBER HEX_NUMBER
+
+%%
+
+number: BIN_NUMBER
+      | OCT_NUMBER
+      | DEC_NUMBER
+      | HEX_NUMBER
+      {
+        printf("Saw a number\n");
+      }
+      ;