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Full Discussion: CSH Calculator Script
Top Forums Shell Programming and Scripting CSH Calculator Script Post 302925029 by ksmarine1980 on Thursday 13th of November 2014 02:45:02 PM
Old 11-13-2014
CSH Calculator Script

Using the C Shell, I'm building a script that will compute simple mathematical computations (addition, subtraction, multiplication, division). The user will enter two integers (operands) on the command line separated by the operation (operator) they wish to perform.

Example of the command line would be as follows: ./scriptname 5 minus 2

I have that part working perfectly. Where I'm running into a problem is the following:

1) If the any of the operands or operator are missing from the command line I want to print an error

2) If the user enters an invalid operator (not +, -, %, X) the script shall will print an error)

I've attached my script below. If you have any recommendations for the above two issues your help would be greatly appreciated. Thank you!

Code:
if ( $2 =~ "plus" ) then
        @ c = $1 + $3
        echo "The sum is: $c"

else if ( $2 =~ "minus" ) then
        @ c = $1 - $3
        echo "The difference is: $c"

else if ( $2 =~ "div" ) then
        @ c = $1 / $3
        echo "The quotient is: $c"

else if ( $2 =~ "times" ) then
        @ c = $1 * $3
        echo "The product is: $c"

else if ( ( $2 !~ "plus" || $2 !~ "minus" ) && ( $2 !~ "div" || $2 !~ "times" ) ) then
        echo "You have entered an invalid operation"

else
        echo "You are missing an operand or operator"
endif

 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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