BEGIN main
INPUT userOption
WHILE userOption<>0 DO
SWITCH userOption
CASE 0: PRINT "bye!"
CASE 1: CALL updatedata
CASE 2: CALL displaydata
END SWITCH
END WHILE
END main
BEGIN displaydata
FOR all item in array PRINT item values
END displaydata
BEGIN updatedata
INPUT indexnumber, arrayvalue
arr[indexnumber]=arrayvalue
END updatedata