diff --git a/interpreter.cpp b/interpreter.cpp
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--- /dev/null
+++ b/interpreter.cpp
@@ -0,0 +1,9 @@
+//
+// interpreter.cpp
+// curly
+//
+// Created by Bob Polis at 2020-09-05
+// Copyright (c) 2020 SwiftCoder. All rights reserved.
+//
+
+#include "interpreter.hpp"
diff --git a/interpreter.hpp b/interpreter.hpp
new file mode 100644
index 0000000..4e533de
--- /dev/null
+++ b/interpreter.hpp
@@ -0,0 +1,73 @@
+//
+// interpreter.hpp
+// curly
+//
+// Created by Bob Polis at 2020-09-05
+// Copyright (c) 2020 SwiftCoder. All rights reserved.
+//
+
+#ifndef _interpreter_H_
+#define _interpreter_H_
+
+#include <iostream>
+#include <string>
+#include <vector>
+#include <map>
+
+class interpreter {
+    public:
+        interpreter() = default;
+
+        std::string eval(std::istream& in);
+
+    private:
+        std::vector<std::string> _ops;
+        std::map<std::string, std::vector<std::string>> _funs;
+
+        // integer operations
+        void add();
+        void sub();
+        void mul();
+        void div();
+        void mod();
+        void abs();
+        void neg();
+        void dup();
+        void inc();
+        void dec();
+
+        // string operations
+        void rev();
+        void slc();
+        void idx();
+        void cat();
+        void len();
+        void rot();
+
+        // tests
+        void teq();
+        void tne();
+        void tlt();
+        void tle();
+        void tgt();
+        void tge();
+
+        // blocks
+        void end();
+        
+        // conditionals
+        void ift();
+        void els();
+
+        // loops
+        void whl();
+
+        // functions
+        void fun();
+        void run();
+
+        // solution
+        void sol();
+};
+
+#endif // _interpreter_H_