disp$(\text{'}$Welcome to the Unit Conversion Program'$)$;

while true

inputValue $=$ input$(\text{'}$Please enter the number to be converted $($or type $\text{'}\text{'}$exit$\text{'}\text{'}$ to quit$)$: $\text{'},\text{'}$s$\text{'})$

if strcmpi$($inputValue$,$ 'exit'$)\%$ Check if the user wants to exit

break;

end

$\%$ Convert the input value to a number

inputValue $=$ str$2$double$($inputValue$)$;

$\%$ Check if the input is valid

if isnan$($inputValue$)$

disp$(\text{'}$Invalid number. Please try again.$\text{'})$;

continue;

end

$\%$ Display conversion options

disp$(\text{'}$Choose the conversion type:$\text{'})$;

disp$(\text{'}1.$ fahrenheit to celsius'$)$;

disp$(\text{'}2.$ celsius to fahrenheit'$)$;

disp$(\text{'}3.$ centimetre to inches'$)$;

disp$(\text{'}4.$ inches to centimetre'$)$;

disp$(\text{'}5.$ meters to feet'$)$;

disp$(\text{'}6.$ feet to meters'$)$;

disp$(\text{'}7.$ kilometres to miles $\text{'})$;

disp$(\text{'}8.$ miles to kilometres'$)$;

disp$(\text{'}9.$ grams to ounces'$)$;

disp$(\text{'}10.$ ounces to grams'$)$;

disp$(\text{'}11.$ kilogram to pounds'$)$;

disp$(\text{'}12.$ pounds to kilogram'$)$;

disp$(\text{'}13.$ tonne to ton'$)$;

disp$(\text{'}14.$ ton to tonne'$)$;

conversionType $=$ input$(\text{'}$Enter the number of your choice: $\text{'})$;

$\%$ validate the chosen conversion type

if conversionType $<1||$ conversionType $>14\%$ Adjust according to the number of options

disp$(\text{'}$Invalid option. Please try again.$\text{'})$;

continue;

end

$\%$ Call the conversion function

convertedValue $=$ convertUnits$($inputValue$,$ conversionType$)$;

$\%$ Output the result

fprintf$(\text{'}$Converted value: $\%\mathrm{.}2$f

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

end

disp$(\text{'}$Thank you for using the Unit Conversion Program!$\text{'})$;

why is there an error on line $45?$ and why cant my program convert the numbers?