rand() was not declared in this scope, please help‏

eric lin ericlin@fsshl.zzn.com
Wed Sep 8 17:39:00 GMT 2010

dear cygwin/gcc users:
  I compile a simple code which i copied from a book, "The Complete Reference of C++"  Fourth Edition by Herbert Schildt in page 575, rand()
which is clearly not be included in
#include <iostream>
I tried 
#inlcude <cmath>
it still not compile, i.e. same compile error
please help(see which lib I should include)
/* I tried in ubuntu linux on my laptop, it also not compile by same reason */

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