Problem with calculator script Post: 302478864

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Homework and Emergencies Homework & Coursework Questions Problem with calculator script Post 302478864 by zkapopou on Thursday 9th of December 2010 05:19:50 AM

12-09-2010

Registered User

Problem with calculator script

I'm having some trouble implementing a basic calculator using command line options. The script is supposed to take (multiple) arguments -a,-d,-m,-s for addition, multiplication, division, and subtraction. I'm pretty sure I know how to parse through the options with getopt(), but I have no idea how to get both arguments to operate on (ex: 7 -a 7, no idea how to get both 7's). I'm pretty sure I can get the first one, but no idea how to get the second.

Here's my current code:

Code:

#!/bin/bash

function printhelp {
echo "mymath.sh usage:"
echo "   mymath.sh [-options] [num1 num2]"
echo ""
echo "where options include:"
echo ""
echo " options that require 2 arguments (multiple options are allowed):"
echo "   -a   add           add num1 and num2"
echo "   -s   subtract      perform num1 minus num2"
echo "   -d   divide        divide num1 by num2 (integer division)"
echo "   -m   multiply      multiply num1 and num2"
echo ""
echo " options that cannot take any arguments, nor any other option:"
echo "   -h   help          display this message"
echo "   -v   version       provides the script's version (hard-coded)"
}

function printversion {
echo "Welcome to MyMath! Current version is v1.0"
}

function add {
   sum="$1 + $2"
   echo $sum
}

function multiply {
   product="$1" * "$2"
   echo $product
}

function subtract {
   diff="$1" - "$2"
   echo $diff
}

function divide {
   quotient="$1"/"$2"
   echo $quotient
}

if [ $# -le 1 ];
then
   if [ "$1" == "-h" ]; then
      printhelp
   elif [ "$1" == "-v" ]; then
      printversion
   else 
      printhelp
   fi
fi

while getopts "a:s:d:m:" opt
do
  case "$opt" in
    a) add $oper1 $oper2    
    ;;
    s) subtract $oper1 $oper2
    ;;
    d) divide $oper1 $oper2
    ;;
    m) multiply $oper1 $oper2
    ;;
    \?) 
    echo "Invalid option: -$OPTARG" >&2
    echo ""
    printhelp;;
    :)
        echo "Option -$OPTARG requires an argument." >&2
    printhelp
        exit 1
      ;;

  esac
done

Thanks for any help.

zkapopou

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LEARN ABOUT DEBIAN

calcoo

CALCOO(1)							Calcoo Manual Page							 CALCOO(1)

NAME

       Calcoo - scientific calculator (GTK+).

SYNOPSIS

       calcoo [OPTION]

DESCRIPTION

       Calcoo is a scientific calculator designed to provide maximum usability. The features that make Calcoo attractive are:

       *      bitmapped button labels and display digits to improve readability

       *      no double-function buttons - you need to click only one button for any operation (except for arc-hyp trigonometric functions)

       *      undo/redo buttons

       *      both RPN and algebraic modes

       *      display marks to separate thousands

       *      copy/paste interaction with the X clipboard

       *      two memory registers with displays

       *      displays for Y, Z, and T registers

OPERATION

       Like  in a regular calculator. Settings (switching between RPN and algebraic modes, rounding, RPN stack behavior) can be accessed by press-
       ing the button labelled "!". The button labelled "?" brings up the help/info window.

OPTIONS

       Calcoo accepts the following command-line options:

       -h, --help
	      Show summary of options and exit.

       -v, --version
	      Print version number and exit.

OTHER INFO

       The webpage for Calcoo is at

       http://calcoo.sourceforge.net/

       There you can find more information about Calcoo and download the latest version.

AUTHOR

       Alexei Kaminski (alexei.kaminski@gmail.com)

BUGS

       None I am aware of. If you find any, please report them.

Version 1.3.18							    18 Aug 2007 							 CALCOO(1)