Add compile principle experiment 3.

1 files changed, 25 insertions, 0 deletions

diff --git a/compile-principle-experiment/3/main.h b/compile-principle-experiment/3/main.h
new file mode 100644
index 0000000..9bd6e56
--- /dev/null
+++ b/compile-principle-experiment/3/main.h
@@ -0,0 +1,25 @@
+#pragma once
+
+typedef union SymbolValue {
+  double val;
+  double (*ptr)();
+} SymbolValue;
+
+typedef struct Symbol {
+  char *name;
+  int type;
+  SymbolValue value;
+  struct Symbol *next;
+} Symbol;
+
+Symbol *cru_symbol_lookup(const char *name);
+Symbol *cru_symbol_install(const char *name, int type, SymbolValue value);
+
+double Pow(double x, double y);
+
+int yylex();
+int yyparse();
+void yyerror(const char *s);
+
+extern int lineno;
+void execerror(const char *s, const char *t);