Hi, I am working on a program that will return in 3 arguments, a meal price, a tax, a tip and a total amount paid. I am having trouble with the code

Question

This is the shellchecked and updated code. I would be very grateful for any help! More specifically, the code will either not run, or it will run but it will return an error message, and I will be unable to enter any numbers that will be the price of a meal. The error message that pops up when I attempt to run the code is: stinput: command not found and then : command not found which repeats twice. Update: I tried the code the way that user down below suggested so this is the updated code and the error message:

    #!/bin/bash
NumberofInputs="$1"
total=$(( $1 * $2))
total=$(("$total" / 100))
total=$(("$total" +  $3 + "$NumberofInputs"))
echo "The price of the meal is: $1"
echo "The tax for the meal is: $2"
echo "The tip for the meal is: $3"
echo "The total amount paid is: $total"
exit 1

UPDATE: When I remove the first part of user000001 code, I get this error: bash: * : syntax error: operand expected (error token is "* ") bash: "" / 100: syntax error: operand expected (error token is """ / 100") bash: "" + + : syntax error: operand expected (error token is """ + + ") But when I leave the 1st part of user000001's code in, I get this error message: echo I'm sorry, that is incorrect, please enter only 3 parameters.: command not found

UPDATE: I figured out the answer, it was removing the quotations and spacing all the variables together. Thank you to everyone for your help!

Answer 1

To do arithmetic in bash you need double parentheses, also the positional arguments are $1 $2 etc;

I think you want

total=$(($1 * $2))

The complete script would be

$ cat script.sh 
#!/bin/bash
if [[ $# != 3 ]]
then
   echo "Usage: $0 price tax tip" 1>&2
   exit 1
fi

tax=$(( $1 * $2 / 100 ))
total=$(( tax + $3 + $1 ))

echo "The price of the meal is:  $1"
echo "The tax for the meal is: $tax"
echo "The tip for the meal is: $3"
echo "The total amount paid is: $total"

$ ./script.sh 10 20 4
The price of the meal is:  10
The tax for the meal is: 2
The tip for the meal is: 4
The total amount paid is: 16