added recognition of # at start of line as comment desginator

interpreter.cpp

@@ -47,6 +47,12 @@ std::string interpreter::eval(std::istream& in, bool& done) {
         // fetch next instruction
         std::string code {_prog[_pc]};
 
+        // check comment
+        if (code[0] == '#') {
+            _pc++;
+            continue;
+        }
+
         // check literal int
         if (std::isdigit(code[0])) {
             _stack.push_back(code);