$\%$ Prompt the user for the bill amount

billAmount $=$ input$(\text{'}$Enter the bill amount: $\text{'})$;

$\%$ Prompt the user for the quality of service

serviceQuality $=$ input$(\text{'}$How was the service? $(1-$ good, $2-$ average, $3-$ bad$)$: $\text{'},\text{'}$s$\text{'})$;

$\%$ Initialize variables for tip percentage and total amount

tipPercentage $=0$;

totalAmount $=0$;

$\%$ Determine the tip percentage based on service quality

if strcmp$($serviceQuality$,\text{'}1\text{'})\%$ Good service

tipPercentage $=0\mathrm{.}20$; $\%20\%$ tip

elseif strcmp$($serviceQuality$,\text{'}2\text{'})\%$ Average service

tipPercentage $=0\mathrm{.}18$; $\%18\%$ tip

elseif strcmp$($serviceQuality$,\text{'}3\text{'})\%$ Bad service

tipPercentage $=0\mathrm{.}15$; $\%15\%$ tip

else $\%$ Invalid input

fprintf$(\text{'}$Invalid input. Please enter $1,2,$ or $3.$

$\text{'})$;

return; $\%$ Exit the script

end

$\%$ Calculate the total amount including the tip

totalAmount $=$ billAmount $+($billAmount $*$ tipPercentage$)$;

$\%$ Display the formatted total amount

fprintf$(\text{'}$The total bill including tip is: $$\%\mathrm{.}2$f

$\text{'},$ totalAmount$)$;