Unable to compile output of lex

Question

When I attempt to compile the output of this trivial lex program:

# lex.l
integer   printf(\"found keyword INT\");

using:

$         


        

Answer 1

As Eli's answer implies, that's not a trivial lex program. It's a trivial lex file, and thus a portion of a program, but it (like any lex file) needs to be combined with some C code to make a complete program. In particular, you still need a main function (which you write in C or C++ or something, in a separate file), and you will also need to write a yywrap function that provides the interface between the lex code and the rest of your C code.