10 REM 'EXCHANGE' TEST PROGRAM
20 PRINT "ENTER TWO VALUES (SEPARATED BY COMMAS"
30 INPUT A,B
35 IF A=0 AND B=0 THEN 99
40 IF A<=B THEN 60
50 EXCHANGE A,B
60 PRINT A;"IS LESS THAN OR EQUAL TO";B
70 GOTO 20
99 END
