Thread: Algorithm

This is working algorithm version 1 when Exam is of type Integer

Code:

// program exits loop when Exam is valid or
// when TERMINATION_VALUE = -99 is entered
start loop
    output to screen "Enter a score"
    store input to Exam
    exit loop when ( 0 <= Exam <= 100 ) or 
                   when ( Exam = TERMINATION_VALUE)
    output "exam score is 0 .. 100"
end loop

Second version with Exam is of type Integer 1 .. 100

Code:

// program exits loop when Exam is valid or
// when TERMINATION_VALUE = -99is entered
start loop
   begin handler block
       output to screen "Enter a score"
       store input to Exam
       exit 
       exception when CONSTRAINT_ERROR       
           output "exam score is 0 .. 100"

   end handler block
end loop

Second version exits loop when Exam is valid, but then how to exit when Exam = TERMINATION_VALUE

Originally posted by cyberCLoWn
Use a do while() loop.

Not really the answer that I expected. My code could be implemented as do-while loop but when Exam = TERMINATION_VALUE, the CONSTRAINT_ERROR exception catches it (instead of breaking out of the loop) and it's back to looping again

Originally posted by alphaoide
Second version with Exam is of type Integer 1 .. 100

Code:

// program exits loop when Exam is valid or
// when TERMINATION_VALUE = -99is entered
start loop
   begin handler block
       output to screen "Enter a score"
       store input to Exam
       exit 
       exception when CONSTRAINT_ERROR       
           output "exam score is 0 .. 100"

   end handler block
end loop

Second version exits loop when Exam is valid, but then how to exit when Exam = TERMINATION_VALUE

By your definition,
1) exam can be only 0 -> 100 (or 1-> 100 depending on which information you actually code)
2) TERMINATION_VALUE = -99
since TERMINATION_VALUE is an illegal value, the exception is thrown.

Try changing to:
1) exam can be only -1 -> 100
2) TERMINATION_VALUE = -1