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How to use square values in Shell Scripting?

 
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# 1  
Old 11-28-2014
How to use square values in Shell Scripting?
Smilie

Hi

I am a newbie with Shell Scripting who stuck while creating a shell script for Pythagoras theorem.I need to know how to add the squares for the value in shell scripting(for eg: b2 =a2 +c2).

Thanks
VR
Last edited by VoraciousReader; 11-28-2014 at 03:11 AM..
# 2  
Old 11-28-2014
Code:
a=2
b=3
echo $(( (a*a) + (b*b) ))

# 3  
Old 11-28-2014
@balajesuri
thanks for the information but what would be the command for sh scripting ?
Regards
VR
# 4  
Old 11-28-2014
Bash doesn't do square roots though.You can pipe your formula to a more powerful math app -- bc
Code:
a=4
b=12
echo "scale=5; sqrt($a^2 + $b^2)" | bc  # print to screen
or
c=$(echo "scale=5; sqrt($a^2 + $b^2)" | bc)  # save in variable c
echo $c

scale is how many decimal places.
Last edited by ongoto; 11-28-2014 at 06:06 AM.. Reason: more options
# 5  
Old 11-28-2014
If you have a 1993 or later version of the Korn shell, save the following in a file named pythagorus:
Code:
#!/bin/ksh
b=$1
c=$2
printf 'b=%f\n' "$b"
printf 'b**2=%f\n' $((b**2))
printf 'c=%f\n' "$c"
printf 'c**2=%f\n' $((c**2))
printf 'b**2 + c**2=%f\n' $((b**2 + c**2))
printf '(b**2 + c**2)**.5=%f\n' $(((b**2 + c**2)**.5))
printf 'sqrt(b**2 + c**2)=%f\n' $((sqrt(b**2 + c**2)))

and make it executable with:
Code:
chmod +x pythagorus

and invoke it with two operands such as one of the following:
Code:
./pythagorus 2 3
./pythagorus .05 .12
./pythagorus 50 120

you'll get output like:
Code:
b=2.000000
b**2=4.000000
c=3.000000
c**2=9.000000
b**2 + c**2=13.000000
(b**2 + c**2)**.5=3.605551
sqrt(b**2 + c**2)=3.605551

Code:
b=0.050000
b**2=0.002500
c=0.120000
c**2=0.014400
b**2 + c**2=0.016900
(b**2 + c**2)**.5=0.130000
sqrt(b**2 + c**2)=0.130000

and
Code:
b=50.000000
b**2=2500.000000
c=120.000000
c**2=14400.000000
b**2 + c**2=16900.000000
(b**2 + c**2)**.5=130.000000
sqrt(b**2 + c**2)=130.000000

respectively.

If you don't have a recent ksh, you can use the following script using dc (which is the back end to the bc utility on many systems) with any shell that accepts basic Bourne shell syntax (such as bash, dash, ksh, or (on almost any system) /bin/sh):
Code:
#!/bin/ksh
b=$1
c=$2
printf '%s\n' "6k $b sb $c sclb[b=]np2^[b**2=]nplc[c=]np2^[c**2=]np+
[b**2 + c**2=]npv[sqrt(b**2 + c**2)=]npq" | dc

and with the same three commands, get the output:
Code:
b=2
b**2=4
c=3
c**2=9
b**2 + c**2=13
sqrt(b**2 + c**2)=3.605551

Code:
b=.05
b**2=.0025
c=.12
c**2=.0144
b**2 + c**2=.0169
sqrt(b**2 + c**2)=.130000

and
Code:
b=50
b**2=2500
c=120
c**2=14400
b**2 + c**2=16900
sqrt(b**2 + c**2)=130.000000

Last edited by Don Cragun; 11-28-2014 at 07:36 AM.. Reason: Remove extraneous printf call from my internal tests.
This User Gave Thanks to Don Cragun For This Post:
rbatte1
 
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