arithmatic


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# 1  
Error arithmatic

Hi Guys,

I am relatively new to scripting at the moment and am struggling to get the following function to work. For some reason it does not recognise the arithmatic symbol when i select option1. Any help would be greatly appreciated.

Code:
 
menu ()
{
echo "=============="
echo "Calculator"
echo "=============="
echo "1. Divide"
echo "2. Multiply and Subtract"
echo "3. Quit"
read choice
case $choice in
1) option1 ;;
2) option2 ;;
3) exit 0 ;;
*) echo "invalid option" ;;
esac
}

option1 ()
{
a=$1
b=$2
c=$(($a/$b))
echo "**********"
echo "****"$c"****"
echo "**********"
}
menu

# 2  
Syntax is fine for bash...
Code:
$ a=10 b=2 c=$(($a/$b))

$ echo $c
5

What shell are you using?
# 3  
Oh I see the problem. $1 and $2 are local to functions but you are not passing parameters to the function. Perhaps define a and b outside of the functions, e.g...
Code:
$ cat sh.1
menu ()
{
echo "=============="
echo "Calculator"
echo "=============="
echo "1. Divide"
echo "2. Multiply and Subtract"
echo "3. Quit"
read choice
case $choice in
1) option1 ;;
2) option2 ;;
3) exit 0 ;;
*) echo "invalid option" ;;
esac
}

option1 ()
{
c=$(($a/$b))
echo "**********"
echo "****"$c"****"
echo "**********"
}
a=$1
b=$2
menu

$ sh sh.1 50 5
==============
Calculator
==============
1. Divide
2. Multiply and Subtract
3. Quit
1
**********
****10****
**********

$

This User Gave Thanks to Ygor For This Post:
# 4  
MySQL

I am using a bash shell. This is the error message i keep getting:

ex2: line 23: /: syntax error: operand expected (error token is "/")

any ideas?

---------- Post updated at 02:46 PM ---------- Previous update was at 02:42 PM ----------

Thank you that makes perfect sense.
# 5  
Quote:
Originally Posted by somersetdan
I am using a bash shell. This is the error message i keep getting:

ex2: line 23: /: syntax error: operand expected (error token is "/")

any ideas?

---------- Post updated at 02:46 PM ---------- Previous update was at 02:42 PM ----------

Thank you that makes perfect sense.
What is the line 23 ?
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