Creating a simple Command line linux calculator

[doomgaze]

I have some project for linux class and we have to make a command line program to do something and I figured I'd make a simple calculator here is what I have:


I'm skipping most of the stupid code that isn't necessary aka most of the echos and user prompts

but:
The user is prompted to enter two numbers NUM1 and NUM2, after which they have another prompt to select which operator to use.

echo -n "please enter the first number"
read NUM1

echo -n "Please enter the second number."
read NUM2s

echo -n "Please enter which operator you would like to use"
read selection

case $selection in
m) let ans=num1*num2 ; echo $ans;;
*) echo -n "Please enter proper data"
esac

echo " "

the output gives me a '0' every time..why is that?

[i92guboj]

That's probably because NUM1 and num1 are two different variable names. Case matters.

[doomgaze]

That's probably because NUM1 and num1 are two different variable names. Case matters.

Yeah, I shortly noticed that after I posted, forgot to edit. Here is my error:
NewScript: line 26: let: =: syntax error: operand expected (error token is "=")