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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
Old 12-09-2010
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.
 

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MSSQL_FETCH_FIELD(3)													      MSSQL_FETCH_FIELD(3)

mssql_fetch_field - Get field information

SYNOPSIS
object mssql_fetch_field (resource $result, [int $field_offset = -1]) DESCRIPTION
mssql_fetch_field(3) can be used in order to obtain information about fields in a certain query result. PARAMETERS
o $result - The result resource that is being evaluated. This result comes from a call to mssql_query(3). o $field_offset - The numerical field offset. If the field offset is not specified, the next field that was not yet retrieved by this function is retrieved. The $field_offset starts at 0. RETURN VALUES
Returns an object containing field information. The properties of the object are: o name - column name. if the column is a result of a function, this property is set to computed#N, where #N is a serial number. o column_source - the table from which the column was taken o max_length - maximum length of the column o numeric - 1 if the column is numeric o type - the column type. EXAMPLES
Example #1 mssql_fetch_field(3) example <?php // Connect to MSSQL and select the database mssql_connect('MANGOSQLEXPRESS', 'sa', 'phpfi'); mssql_select_db('php'); // Send a select query to MSSQL $query = mssql_query('SELECT * FROM [php].[dbo].[persons]'); // Construct table echo '<h3>Table structure for 'persons'</h3>'; echo '<table border="1">'; // Table header echo '<thead>'; echo '<tr>'; echo '<td>Field name</td>'; echo '<td>Data type</td>'; echo '<td>Max length</td>'; echo '</tr>'; echo '</thead>'; // Dump all fields echo '<tbody>'; for ($i = 0; $i < mssql_num_fields($query); ++$i) { // Fetch the field information $field = mssql_fetch_field($query, $i); // Print the row echo '<tr>'; echo '<td>' . $field->name . '</td>'; echo '<td>' . strtoupper($field->type) . '</td>'; echo '<td>' . $field->max_length . '</td>'; echo '</tr>'; } echo '</tbody>'; echo '</table>'; // Free the query result mssql_free_result($query); ?> SEE ALSO
mssql_field_seek(3). PHP Documentation Group MSSQL_FETCH_FIELD(3)
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