interpreter

[qiqinuinaifen128]

Hi there,

is anybody using c writing an interpreter before?
i want to interpret a string which key by user, What command should i use?

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[xwb]

gets will the the whole line in
scanf has a complicated syntax between the quotes for parsing all sorts of stuff.

If the language you are interpreting has a defined syntax, might be an idea to look at lex and yacc.

 

[qiqinuinaifen128]

can you provide me some example?

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[xwb]

Google is you friend

lex & yacc

http://ds9a.nl/lex-yacc/cvs/lex-yacc-howto.html

gets & scanf - example of usage

http://www.thescripts.com/forum/thread215235.html

The thing is to define you language first. If it has common delimiters, you could use strtok to split up the words but note that this is not thread safe so if you are using it in a multi threaded env, always use it in the same thread.

 

[pentode]

http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1044652485&id=1043284385