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Full Discussion: Simple maths calculator loop.
Top Forums Shell Programming and Scripting Simple maths calculator loop. Post 302583063 by methyl on Monday 19th of December 2011 12:45:36 PM
Old 12-19-2011
Using as much of the orginal code as possible we can create a simple "while true loop around the decision whether to quit or do another calculation. We enter the value for $n1 once at the top of the script and from that point on seed $n1 with the value of a running total in $total.

Code:
echo "please enter a number"
read n1

total=0

while true
do
     echo "please choose an operation (or press c/r to exit)"
     echo "1. add"
     echo "2. subtract"
     echo "3. divide"
     echo "4. multiply"
     read opr
     # Exit if user pressed carriage-return
     if [ "${opr}""X" = "X" ]
     then
         break
     fi

     echo "please enter a number again"
     read n2
     # Do the calculation required
     if [ $opr = "1" ]
         then
              total=$((n1+n2))
         elif [ $opr = "2" ]
         then  
              total=$((n1-n2))
         elif [ $opr = "3" ]
         then
              total=$((n1/n2))
         elif [ $opr = "4" ]
         then
              total=$((n1*n2))
     fi
     # Display running total
     echo ""
     echo "     Running total: $total"
     echo ""
     # Seed $n1 with the current value of $total
     n1=$total 
done

The modified script keeps on asking for more calculation on the running total until the user presses carriage-return.
You could add a line just before "break" to display "Final total is $total" if that is a requirement.
Try it and enjoy.
Last edited by methyl; 12-19-2011 at 08:38 PM.. Reason: inconsistent f1 n1
 

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LEARN ABOUT PHP

dateinterval.format

DATEINTERVAL.FORMAT(3)							 1						    DATEINTERVAL.FORMAT(3)

DateInterval::format - Formats the interval

SYNOPSIS

       public string DateInterval::format (string  $format)

DESCRIPTION

	Formats the interval.

PARAMETERS

	      o $format
		-

	       The following characters are recognized in the $format parameter string. Each format character must be prefixed by a percent sign (
	      %).

	      +------------------+--------------------------------------+---+
	      |$format character |					|   |
	      | 		 |					|   |
	      | 		 |	       Description		|   |
	      | 		 |					|   |
	      | 		 |	      Example values		|   |
	      | 		 |					|   |
	      +------------------+--------------------------------------+---+
	      | 		 |					|   |
	      |        %	 |					|   |
	      | 		 |					|   |
	      | 		 |		Literal %		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		    %			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        Y	 |					|   |
	      | 		 |					|   |
	      | 		 | Years, numeric, at  least  2  digits |   |
	      | 		 | with leading 0			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		  01, 03		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        y	 |					|   |
	      | 		 |					|   |
	      | 		 |	      Years, numeric		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		   1, 3 		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        M	 |					|   |
	      | 		 |					|   |
	      | 		 | Months,  numeric,  at least 2 digits |   |
	      | 		 | with leading 0			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		01, 03, 12		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        m	 |					|   |
	      | 		 |					|   |
	      | 		 |	     Months, numeric		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		 1, 3, 12		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        D	 |					|   |
	      | 		 |					|   |
	      | 		 | Days, numeric,  at  least  2  digits |   |
	      | 		 | with leading 0			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		01, 03, 31		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        d	 |					|   |
	      | 		 |					|   |
	      | 		 |	      Days, numeric		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		 1, 3, 31		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        a	 |					|   |
	      | 		 |					|   |
	      | 		 | Total  number of days as a result of |   |
	      | 		 | a DateTime::diff or (unknown) other- |   |
	      | 		 | wise 				|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |	       4, 18, 8123		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        H	 |					|   |
	      | 		 |					|   |
	      | 		 | Hours,  numeric,  at  least 2 digits |   |
	      | 		 | with leading 0			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		01, 03, 23		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        h	 |					|   |
	      | 		 |					|   |
	      | 		 |	      Hours, numeric		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		 1, 3, 23		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        I	 |					|   |
	      | 		 |					|   |
	      | 		 | Minutes, numeric, at least 2  digits |   |
	      | 		 | with leading 0			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		01, 03, 59		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        i	 |					|   |
	      | 		 |					|   |
	      | 		 |	     Minutes, numeric		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		 1, 3, 59		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        S	 |					|   |
	      | 		 |					|   |
	      | 		 | Seconds,  numeric, at least 2 digits |   |
	      | 		 | with leading 0			|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		01, 03, 57		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        s	 |					|   |
	      | 		 |					|   |
	      | 		 |	     Seconds, numeric		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		 1, 3, 57		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        R	 |					|   |
	      | 		 |					|   |
	      | 		 | Sign " -" when negative, "  +"  when |   |
	      | 		 | positive				|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		   -, + 		|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      |        r	 |					|   |
	      | 		 |					|   |
	      | 		 | Sign  " -" when negative, empty when |   |
	      | 		 | positive				|   |
	      | 		 |					|   |
	      | 		 |					|   |
	      | 		 |		    -,			|   |
	      | 		 |					|   |
	      +------------------+--------------------------------------+---+
RETURN VALUES

	Returns the formatted interval.

NOTES

       Note

	       The DateInterval::format method does not recalculate carry over points in time strings nor  in  date  segments.	This  is  expected
	      because  it is not possible to overflow values like "32 days" which could be interpreted as anything from "1 month and 4 days" to "1
	      month and 1 day".

EXAMPLES

       Example #1

	      DateInterval example

	      <?php

	      $interval = new DateInterval('P2Y4DT6H8M');
	      echo $interval->format('%d days');

	      ?>

	      The above example will output:

	      4 days

       Example #2

	      DateInterval and carry over points

	      <?php

	      $interval = new DateInterval('P32D');
	      echo $interval->format('%d days');

	      ?>

	      The above example will output:

	      32 days

       Example #3

	      DateInterval and DateTime::diff with the %a and %d modifiers

	      <?php

	      $january = new DateTime('2010-01-01');
	      $february = new DateTime('2010-02-01');
	      $interval = $february->diff($january);

	      // %a will output the total number of days.
	      echo $interval->format('%a total days')."
";

	      // While %d will only output the number of days not already covered by the
	      // month.
	      echo $interval->format('%m month, %d days');

	      ?>

	      The above example will output:

	      31 total days
	      1 month, 0 days

SEE ALSO

       DateTime::diff.

PHP Documentation Group 												    DATEINTERVAL.FORMAT(3)
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