#!/bin/bash

# SCRIPT: armstrong_bw_range.sh

# USAGE: armstrong_bw_range.sh

# PURPOSE: Finding Armstrong numbers between given range.

# \\\\ ////

# \\ - - //

# @ @

# ---oOOo-( )-oOOo---

#Armstrong numbers are the sum of their own digits to the power of

#the number of digits. As that is a slightly brief wording, let me

#give an example:

#153 = 1³ + 5³ + 3³

#Each digit is raised to the power three because 153 has three

#digits. They are totalled and we get the original number again!

#Notice that Armstrong numbers are base dependent,but we'll mainly be

#dealing with base 10 examples.The Armstrong numbers up to 5 digits

#are 1 to 9,153, 370, 371, 407, 1634, 8208, 9474, 54748, 92727, 93084

#

#####################################################################

# Script Starts Here #

#####################################################################

echo -n "Enter the Lower Limit : "

read Start

echo -n "Enter the Upper Limit : "

read Ending

echo "Armstrong Numbers between $Start and $Ending are: "

while [ $Start -le $Ending ]

do

Number=$Start

Length=${#Number}

Sum=0

OldNumber=$Number

while [ $Number -ne 0 ]

do

Rem=$((Number%10))

Number=$((Number/10))

Power=$(echo "$Rem ^ $Length" | bc )

Sum=$((Sum+Power))

done

if [ $Sum -eq $OldNumber ]

then

echo -n "$OldNumber "

fi

let Start++

done

echo

**OUTPUT:**

# sh armstrong_bw_range.sh

Enter the Lower Limit : 1

Enter the Upper Limit : 500

Armstrong Numbers between 1 and 500 are:

1 2 3 4 5 6 7 8 9 153 370 371 407

# sh armstrong_bw_range.sh

Enter the Lower Limit : 1000

Enter the Upper Limit : 10000

Armstrong Numbers between 1000 and 10000 are:

1634 8208 9474

## Monday, December 20, 2010

Posted by venu k

14 comments | 12:08 PM

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thanks

ReplyDeletegud page!

ReplyDeleten itz xtremely useful for beginners like me..!

Armstrong numbers are---->

ReplyDelete1 2 3 4 5 6 7 8 9 153 370 371 407 1634 8208 9474 54748 92727 93084 548834 1741725 4210818 9800817 9926315 24678050 24678051 88593477 146511208 472335975 534494836 912985153 etc.

1 to 9 armstrong numbers.........????

ReplyDeleteHow.....???????/

This comment has been removed by the author.

DeleteA number N is an Armstrong number of order n (n being the number of digits)

Deleteif

abcd. . . = a^n + b^n + c^n + d^n .+ ...= N

so in case of 1 to 9 number of digit is 1 so 1^1 = 1 ..... but 10 has two digit => 1^2 + 0^2 != 10 ,,,,,

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