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Top Forums Shell Programming and Scripting Simple maths calculator loop. Post 302583043 by johnthebaptist on Monday 19th of December 2011 11:17:11 AM
Old 12-19-2011
Simple maths calculator loop.

Hi, I am trying to make a maths calculator that:

1. Prompts the user for a number.
2. Prompts the user for an operation (add, subtract, divide or multiply)
3. Prompts the user for a number.
4. Prompts the user for another operation (same as above) OR the option to get the result for the equation.
5. The script should loop back if the user chooses to add another operation, and ask for another number (repeat until result)

Now, i already have the arithmetic sorted, and i know i have to add an UNTIL loop, but i'm not very good with loops as i find them hard to understand.

Here is a copy of my code so far:

-----
Code:
echo "please enter a number"
read n1

echo "please choose an operation"
echo "1. add"
echo "2. subtract"
echo "3. divide"
echo "4. multiply"
read opr

echo "please enter a number again"
read n2

if [ $opr = "1" ]
   then
      echo $((n1+n2))
elif [ $opr = "2" ]
   then  
      echo $((n1-n2))
elif [ $opr = "3" ]
   then
      echo $((n1/n2))
elif [ $opr = "4" ]
   then
       echo $((n1*n2))

fi
exit 0

-----

Can anyone give me any pointers? I really have tried to look for solutions but this is my last hope. ANTHING WILL HELP. THanks

Moderator's Comments:
Mod Comment How to use code tags when posting data and code samples.

Last edited by Franklin52; 12-19-2011 at 12:56 PM.. Reason: Please use code tags for data and code samples, thank you
 

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MSSQL_NUM_FIELDS(3)													       MSSQL_NUM_FIELDS(3)

mssql_num_fields - Gets the number of fields in result

SYNOPSIS
int mssql_num_fields (resource $result) DESCRIPTION
mssql_num_fields(3) returns the number of fields in a result set. PARAMETERS
o $result - The result resource that is being evaluated. This result comes from a call to mssql_query(3). RETURN VALUES
Returns the number of fields, as an integer. EXAMPLES
Example #1 mssql_num_fields(3) example <?php // Connect to MSSQL and select the database $link = mssql_connect('KALLESPCSQLEXPRESS', 'sa', 'phpfi'); mssql_select_db('php', $link); // Select some data from our database $data = mssql_query('SELECT [name], [age] FROM [php].[dbo].[persons]'); // Construct a table echo '<table border="1">'; $header = false; // Iterate through returned results while ($row = mssql_fetch_array($data)) { // Build the table header if (!$header) { echo '<thead>'; echo '<tr>'; for ($i = 1; ($i + 1) <= mssql_num_fields($data); ++$i) { echo '<td>' . ucfirst($row[$i]) . '</td>'; } echo '</tr>'; echo '</thead>'; echo '<tbody>'; $header = true; } // Build the row echo '<tr>'; foreach($row as $value) { echo '<td>' . $value . '</td>'; } echo '</tr>'; } // Close table echo '</tbody>'; echo '</table>'; // Clean up mssql_free_result($data); mssql_close($link); ?> SEE ALSO
mssql_query(3), mssql_fetch_field(3), mssql_num_rows(3). PHP Documentation Group MSSQL_NUM_FIELDS(3)
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