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(guile.info)Executing Scheme code

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Executing Scheme code
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Once you have an interpreter running, you can ask it to evaluate Scheme
code.  There are two calls that implement this:

 - Function: SCM gh_eval_str (char *SCHEME_CODE)
     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_file()'.

 - Function: SCM gh_eval_file (char *FNAME)
 - Function: SCM gh_load (char *FNAME)
     `gh_eval_file' is completely analogous to `gh_eval_str()', except
     that a whole file is evaluated instead of a string.  Returns the
     result of the last expression evaluated.

     `gh_load' is identical to `gh_eval_file' (it's a macro that calls
     `gh_eval_file' on its argument).  It is provided to start making
     the `gh_' interface match the R4RS Scheme procedures closely.