Sinclair QL - Page 111

370 DEFine PROCedure compute(dish, total)
380 LET total = 0
390 FOR k = 1 to 3
400 LET total = total + dish(k)*price(k)
410 END FOR k
420 END DEFine
The waiter also passes information to the cook who simply prints the number required for each menu
item.
430 DEFine PROCedure cook(dish)
440 FOR c = 1 TO 3
450 PRINT ! dish(c) ! item$(c) !
460 END FOR c
470 END DEFine
Again, the array dish in the procedure cook is local. It receives the information which the procedure
uses in its PRINT statement.
The complete program is listed below.
100 REMark Procedures
110 RESTORE 490
120 DIM item$(3,7),price(3),dish(3)
130 REMark *** PROGRAM ***
140 LET tip = 0.1
150 set_up
160 choose dish
170 waiter dish,bill
180 LET bill = bill + tip*bill
190 PRINT "Total cost is £" ; bill
200 REMark *** PROCEDURE DEFINITIONS ***
210 DEFine PROCedure set_up
220 FOR k = 1 TO 3
230 READ item$(k)
240 READ price(k)
250 END FOR k
260 END DEFine
270 DEFine PROCedure choose(dish)
280 FOR pick = 1 TO 6
290 LET number = RND(1 TO 3)
300 LET dish(number) = dish(number) + 1
310 END FOR pick
320 END DEFine
330 DEFine PROCedure waiter(dish,cost)
340 compute dish,cost
350 cook dish
360 END DEFine
370 DEFine PROCedure compute(dish,total)
380 LET total = 0
390 FOR k = 1 TO 3
400 LET total = total + dish(k)*price(k)
410 END FOR k
420 END DEFine
430 DEFine PROCedure cook(dish)
440 FOR c = 1 TO 3
450 PRINT ! dish(c) ! item$(c)
460 END FOR c
470 END DEFine
480 REMark *** PROGRAM DATA ***