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Full Discussion: Not able to exit from case statements
Top Forums Shell Programming and Scripting Not able to exit from case statements Post 302366124 by uxpassion on Thursday 29th of October 2009 12:40:41 AM
Old 10-29-2009
Not able to exit from case statements
Hi all,

I wrote the following simple shell script to perform addition, subtraction, multiplication and division. In the below program, i am not able to exit from the script

Shell Script
-----------

Code:
#!/bin/sh
bgcal() {
cal=""
echo "Enter the Option Number: \c"
read cal
if [ $cal = 1 ]
then
echo "You have selected addition"
elif [ $cal = 2 ]
then
echo "You have selected subtraction"
elif [ $cal = 3 ]
then
echo "You have selected multiplication"
elif [ $cal = 4 ]
then
echo "You have selected division"
else
echo "selection invalid. Please choose between 1-4"
fi
case $cal
in
1) echo "Enter two numbers for addition"
   read a b
   c=`expr $a + $b`
   echo " Addition of $a + $b is $c"
   echo " Do you want to continue"
   read ans
   if [ ans -eq 'yes' ]
   then
   bgcal
   else
   exit 0
   fi;;
2) echo "Enter two numbers for subtraction"
   read a b
   c=`expr $a - $b`
   echo " Subtraction of $a - $b is $c"
   echo " Do you want to continue"
   read ans
   if [ ans -eq 'yes' ]
   then
   bgcal
   else
   exit 0
   fi;;
3) echo "Enter two numbers for multiplication"
   read a b
   c=`expr $a \* $b`
   echo "Multiplication of $a * $b is $c"
   echo " Do you want to continue"
   read ans
   if [ ans -eq 'yes' ]
   then
   bgcal
   else
   exit 0 
   fi;;
4) echo "Enter two numbers for Division"
   read a b
   c=`expr $a / $b`
   echo "Division of $a / $b is $c"
   echo " Do you want to continue"
   read ans
   if [ ans -eq 'yes' ]
   then
   bgcal
   else
   exit 0
   fi;; 
*) echo "Do you want to continue?"
    read opt
     if [ opt -eq "yes" ]
     then
      bgcal
     else
     exit 0
     fi;;
esac
 }
echo "Choose the type of operation"
echo "============================"
echo "1-Addition"
echo "2-Subtraction"
echo "3-Multiplication"
echo "4-Division"
bgcal

Output:

> ./t2.sh
Choose the type of operation
============================
1-Addition
2-Subtraction
3-Multiplication
4-Division
Enter the Option Number: 1
You have selected addition
Enter two numbers for addition
4 5
Addition of 4 + 5 is 9
Do you want to continue
no
Enter the Option Number: 2
You have selected subtraction
Enter two numbers for subtraction
5 3
Subtraction of 5 - 3 is 2
Do you want to continue
no
Enter the Option Number:

Kindly let me know where i am wrong.

Thanks in advance
Last edited by vino; 10-29-2009 at 02:20 AM..
 

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LEARN ABOUT SUSE

arithmetic

ARITHMETIC(6)							 BSD Games Manual						     ARITHMETIC(6)

NAME

     arithmetic -- quiz on simple arithmetic

SYNOPSIS

     arithmetic [-o +-x/] [-r range]

DESCRIPTION

     arithmetic asks you to solve problems in simple arithmetic.  Each question must be answered correctly before going on to the next.  After
     every 20 problems, it prints the score so far and the time taken.	You can quit at any time by typing the interrupt or end-of-file character.

     The options are as follows:

     -o      By default, arithmetic asks questions on addition of numbers from 0 to 10, and corresponding subtraction.	By supplying one or more
	     of the characters +-x/, you can ask for problems in addition, subtraction, multiplication, and division, respectively.  If you give
	     one of these characters more than once, that kind of problem will be asked correspondingly more often.

     -r      If a range is supplied, arithmetic selects the numbers in its problems in the following way.  For addition and multiplication, the
	     numbers to be added or multiplied are between 0 and range, inclusive.  For subtraction and division, both the required result and the
	     number to divide by or subtract will be between 0 and range.  (Of course, arithmetic will not ask you to divide by 0.)  The default
	     is 10.

     When you get a problem wrong, arithmetic will remember the numbers involved, and will tend to select those numbers more often than others, in
     problems of the same sort.  Eventually it will forgive and forget.

     arithmetic cannot be persuaded to tell you the right answer.  You must work it out for yourself.

DIAGNOSTICS

     ``What?'' if you get a question wrong.  ``Right!'' if you get it right.  ``Please type a number.'' if arithmetic doesn't understand what you
     typed.

SEE ALSO

     bc(1), dc(1)

BSD
								   May 31, 1993 							       BSD
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