Once you have an interpreter running, you can ask it to evaluate Scheme code. There are two calls that implement this:
This asks the interpreter to evaluate a single string of Scheme code, and returns the result of the last expression evaluated.
Note that the line of code in scheme_code must be a well formed Scheme expression. If you have many lines of code before you balance parentheses, you must either concatenate them into one string, or use
gh_eval_fileis completely analogous to
gh_eval_str(), except that a whole file is evaluated instead of a string.
gh_loadis identical to
gh_eval_file(it's a macro that calls
gh_eval_fileon its argument). It is provided to start making the
gh_interface match the R5RS Scheme procedures closely.