PROCESS CHAPTER FACTORIAL
ENTRY LABEL ENTRYPOINT
LITERAL TO = 4                              // Assume using the default proforma
EXTERNAL ROUTINE
     OPEN,
     PUT,
     CLOSE,
     TOCHAR
VECTOR () OF BYTE ANSWER = "factorial x = xxxxxx"
 
HALF COUNT
HALF VALUE
FULL RESULT
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     ROUTINE FACT(VALUE)
     // return factorial of RA.
     VALUE => RESULT
     WHILE DECREMENT VALUE GT //0// DO
     <<
          RESULT 
* VALUE => RESULT
     >>
     RETURN(RESULT)
     END
//
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ENTRYPOINT:
     OPEN(TO, 1)
     // Print factorials for numbers 1 through 9
     1 => RA
     REPEAT
     <<
          RA => COUNT
          FACT(RA) => RA
          TOCHAR(RA, 7, ANSWER + 13)
          TOCHAR(COUNT, 2, ANSWER + 9)
          PUT(TO, 20, ANSWER)
          COUNT + 1 => RA
     >>
     WHILE RA LT 10
     CLOSE(TO)
     STOP(0)
     END
//
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