Convert

convert.ss

The teachpack convert.ss provides three functions:

convert-gui, which consumes a conversion function from Fahrenheit to Celsius and creates a graphical user interface with two rulers, which users can use to convert temperatures according to the given temperature conversion function

convert-repl, which consumes a conversion function from Fahrenheit to Celsius and then starts a read-evaluate-print loop. The loop prompts users to enter a number and then converts the number according to the given temperature conversion function. A user can exit the loop by entering x.

convert-file; it consumes a file name in, a
       conversion function from Fahrenheit to Celsius, and a string
       out. The program then reads a number from
       in, converts it according to the given temperature
       conversion function, and prints the result to the newly created file
       out.  


       
Warning: If out already exists, it is
       deleted.




Example: Define a function f2c in the Definitons window. 
Set teachpack to convert.ss and execute. Then evaluate 
> (convert-gui f2c)
> 

This will create a graphical user interface with two rulers. Slide the top
one and click on convert to see the lower one move.