Question

Simple C Shell Program

Asked by: guochu

How to write a script using c shell to convert cm to inches?
formula: cmx0.39 ---> inches
The thing is C shell can't do floating point mathematics :((((

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Asked On
2008-09-07 at 13:58:59ID23710579
Topics

Linux Programming

,

Shell Scripting

,

csh / tcsh

Participating Experts
3
Points
250
Comments
7

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Answers

 

by: wilhelm_voigtPosted on 2008-09-07 at 14:13:14ID: 22412913

why re-invent the wheel? there's a handy little tool called "units" which could do this for you.

try e. g.

units "0.39 cm" "inches"

(maybe you'll have to install it first on your distribution, search for "units" in your distribution's package manager)

 

by: TintinPosted on 2008-09-07 at 14:22:40ID: 22412967

Don't bother with csh.

#!/bin/bash
cm=3
inches=$(echo $cm*0.39|bc)
echo $inches

                                              
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Select allOpen in new window

 

by: guochuPosted on 2008-09-07 at 14:40:41ID: 22413073

Hello Tintin, please use C Shell :)

Hello wilhem, I am not trying to invent a wheel, just want to learn how to write this script in C shell. If you know how, please tell me :)

 

by: TintinPosted on 2008-09-07 at 14:52:15ID: 22413114

Why do you want to write it in csh?  I really wouldn't bother wasting time to script in csh as you'll ultimately get very frustrated with its inconsistencies and limitations.

 

by: ozoPosted on 2008-09-07 at 17:30:04ID: 22413574

#!/bin/csh
set cm=3
set inches=`echo "$cm*0.39"|bc`
echo $inches

 

by: guochuPosted on 2008-09-15 at 18:33:19ID: 22484222

Thanks ozo :)

 

by: wilhelm_voigtPosted on 2008-09-15 at 23:31:51ID: 22485347

Just note that this solution doesn't "use" C shell any more than just using any external program manually on the shell. It just takes the input from another external program, "bc" in this case, which is not C shell specific in any way, but just a general purpose calculator.

If that's good enough for you, you could just have taken "units" in the first place, which would have had the advantage that it already has all the conversion factors already built in.

20120131-EE-VQP-002

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