Hello. I am trying the examples from Bruce Eckel's Thinking in C++ 2nd 
edn and am getting a problem. I have attached the examples I am using 
and the error messages (basically the same kind) which I got. I am 
unable to understand what is wrong when I have followed the book example 
perfectly (AFAIK) except for the variablenames which is immaterial.

Please explain what I did wrong. I am using:

$ g++ -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v 
--enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr 
--enable-shared --with-system-zlib --libexecdir=/usr/lib 
--without-included-gettext --enable-threads=posix --enable-nls 
--program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu 
--enable-libstdcxx-debug --enable-mpfr --enable-checking=release 
i486-linux-gnu
Thread model: posix
gcc version 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5)

Thank you.

Shriramana Sharma.