#!/usr/bin/perl -w

################################
# This document explains how to
# do calculations in perl
# AAK: last modification:
# Tue Sep 11 22:16:20 PDT 2012
# ##############################


$x = log(3.21); #log (natural)
$y = exp(8.1); #expolential function
$z = $x ** $y; #exponent x^y
$p= sqrt($z);

$a = 10 % 4; #modulus

$n = 5;

$n += 1; # equivalent to $n = $n + 1
$n++; #same as previous one
$n--; #same as prevous but subtracts

#similarly:

$n -=7;
$n /= 3.2;
$n *= 8;

$m = 5;

$m %= 3; # i.e: $m = $m % 3

$m **= 2; #equivalent to $m = $m **2

#comparison operators are:
#  
#   != (not equal)
#   == (equal)
#   >
#   <
#   >=
#   <=


#logical operators are:
#  && : AND
#  || : OR