stage 3.

1 files changed, 23 insertions, 0 deletions

diff --git a/s3/dat.h b/s3/dat.h
new file mode 100644
index 0000000..9cdb6c7
--- /dev/null
+++ b/s3/dat.h
@@ -0,0 +1,23 @@
+typedef struct Symbol Symbol;
+typedef struct Const Const;
+typedef struct Builtin Builtin;
+
+struct Symbol {
+	char *name;
+	int type;
+	union {
+		double val;
+		double (*fn)(double);
+	} u;
+	Symbol *next;
+};
+
+struct Const {
+	char *name;
+	double val;
+};
+
+struct Builtin {
+	char *name;
+	double (*fn)();
+};