-void print_block(const char *s, int i, int w);
-int run_command(const char *line, int interactive);
-int run_command_simplify(const char *arg);
-int run_command_explain(const char *arg);
-int run_command_declare(const char *cmdarg);
+enum { INPUT_C, INPUT_ENGLISH };
+enum { OUTPUT_C, OUTPUT_ENGLISH };