A
computer
program
is
a
sequence
of
commands
and
instructions
to
effectively
solve
a
given
problem
Such
a
problem
may
involve
calculations
data
processing
or
both
Each
computer
program
is
based
on
an
underlying
procedure
called
algorithm
An
algorithm
may
be
implemented
in
different
ways
leading
to
different
programs
using
the
same
procedure
We
follow
this
convention
throughout
this
book
where
an
algorithm
refers
to
a
list
of
procedures
whereas
a
program
refers
to
its
implementation
as
a
code
