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Definig Functions

A function is defined as 
function name( args ) { statements }
and can return a value 
return expression

All variables are global..

function set_n(i)
{ n=i; }

BEGIN{ n=6; set_n(1); print n }

.. but arguments are local

function set_n(i,   n)
{ n=i; }

BEGIN{ n=6; set_n(1); print n }