870 LET 0$="18" 880 LET Y=6

890 GOSUB 9000

900 LET A=2 ^ 2*2
910 LET 0$="19"

920 LET Y=8
930 GOSUB 9000

940 LET A=3 3/3

950 LET 0$="20"

960 LET Y=9

970 GOSUB 9000

980 LET A=2^3^2

990 LET 0$="21"

1000 LET Y=64

1010 GOSUB 9000 1020 LET A=- 2+2

1030 LET 0$="22"

1040 LET Y=0

1050 GOSUB 9000

1060 LET A=- 2-2

1070 LET O$="23"

1080 LET Y=-4

1090 GOSUB 9000

1100 LET A=-2 ^ 2

1110 LET O$="24"

1120 LET Y=-4

1130 GOSUB 9000

1140 PRINT

1150 IF F=0 THEN 1180

1160 PRINT "*** TEST FAILED IN ";F;" CASE(S). ****

2010 PRINT "SECTION 26.2: MIXED OPERATORS, PARENTHESES, AND VARIABLES" 2020 PRINT

2030 PRINT "THIS SECTION TESTS THE USE OF PARENTHESES TO ALTER THE" 2040 PRINT "ORDER OF EVALUATION, EXPRESSIONS WITH SEVERAL OPERATORS," 2050 PRINT "AND THE USE OF VARIABLES AND CONSTANTS."

2083 PRINT "CASE #","SHOULD BE","ACTUAL", "OUTCOME"

2086 PRINT

2090 LET F=0

2100 LET 0$="1"

2110 LET A=4

2120 LET A 3-(A-5)

2130 LET Y=4

2140 GOSUB 9000

2150 LET O$="2"

2160 LET B=2

2170 LET A=+2-B+2/B*2^B

PROGRAM FILE 26: PRECEDENCE RULES FOR NUMERIC EXPRESSIONS. ANSI STANDARD 7.2, 7.4

THIS PROGRAM TESTS WHETHER THE PRECEDENCE RULES ARE
CORRECTLY IMPLEMENTED.

SECTION 26.1: PRECEDENCE ACCORDING TO OPERATOR AND
POSITION (LEFT TO RIGHT).

THIS SECTION TESTS THE PRECEDENCE RULES USING SIMPLE
INTEGER OPERANDS AND ALL ORDERED PAIRS OF OPERATORS
FOR WHICH THE ORDER OF EVALUATION MAKES A DIFFERENCE.
NO PARENTHESES ARE USED.

SECTION 26.2: MIXED OPERATORS, PARENTHESES, AND VARIABLES

THIS SECTION TESTS THE USE OF PARENTHESES TO ALTER THE
ORDER OF EVALUATION, EXPRESSIONS WITH SEVERAL OPERATORS,
AND THE USE OF VARIABLES AND CONSTANTS.

5 PRINT "PROGRAM FILE 27: ACCURACY OF CONSTANTS AND VARIABLES." 10 PRINT " ANSI STANDARD 5.2, 5.4, 6.2, 6.4, 10.4"

15 PRINT

20 PRINT "*** NOTE: THIS PROGRAM MAKES USE OF THE ON-GOTO STATEMENT" 25 PRINT" AND FOR-BLOCKS (THE FOR AND NEXT STATEMENTS) WHICH" HAVE NOT YET BEEN TESTED. IF SUBSEQUENT TESTS SHOW" THESE FEATURES TO BE INCORRECTLY IMPLEMENTED, THEN THE " VALIDITY OF THE RESULTS OF THIS TEST ROUTINE IS DOUBTFUL."

30 PRINT "

35 PRINT "

40 PRINT " 45 PRINT

50 PRINT "THIS PROGRAM TESTS THE LEVEL OF ACCURACY OF NUMERIC VALUES," 55 PRINT "USING THE IF-THEN STATEMENT."

60 LET T1-34

70 LET T2-50

80 LET T3=T1+2

90 LET T4-T2+2

100 PRINT

110 PRINT "SECTION 27.1: ACCURACY IN COMPARISON OF VARIABLES." 120 PRINT

130 PRINT "THIS SECTION COMPARES TWO VARIABLES WHICH HAVE BEEN ASSIGNED" 140 PRINT "NUMERICALLY 'CLOSE' VALUES AND THEN DETERMINES WHETHER THE"

150 PRINT "IMPLEMENTATION CAN DISTINGUISH BETWEEN THEM OR IF THEY ARE" 160 PRINT "TREATED AS EQUAL."

170 PRINT

180 LET C$=" >

190 GOSUB 8000

200 LET A = 9.876543212E-7

210 LET A$="9.876543212E-7 : " 220 FOR I=6 TO 9

230 PRINT A$;

240 LET J=I-5

250 ON J GOTO 600,700,800,900

600 LET B= 9.876533E-7

610 PRINT "9.876533E-7"; 620 GOTO 1000

700 LET B= 9.8765422E-7

710 PRINT "9.8765422E-7"; 720 GOTO 1000

800 LET B= 9.87654311E-7

810 PRINT "9.87654311E-7";

820 GOTO 1000

900 LET B= 9.876543201E-7

910 PRINT "9.876543201E-7"; 920 GOTO 1000

1000 LET U$="T"

1010 LET E$="T"

1020 IF A > B THEN 1040

1030 LET U$="F"

1040 IF A = B THEN 1060

1050 LET E$="F"

1060 REM COMPARISONS FINISHED

1200 GOSUB 8160

1210 NEXT I

1220 GOSUB 8280

3000 PRINT "SECTION 27.2: ACCURACY IN THE COMPARISON OF VARIABLES" 3010 PRINT "

3020 PRINT

WITH CONSTANTS."

3030 PRINT "THIS SECTION COMPARES A VARIABLE AND A CONSTANT WHICH HAVE" 3040 PRINT "NUMERICALLY 'CLOSE' VALUES AND THEN DETERMINES WHETHER THE" 3050 PRINT "IMPLEMENTATION CAN DISTINGUISH BETWEEN THEM OR IF THEY ARE" 3060 PRINT "TREATED AS EQUAL."

3070 PRINT

3080 LET C$=" >

3090 GOSUB 8000

3100 LET A$="-9.999988888E36 : "

3110 FOR I=6 TO 9

3120 PRINT A$;

3130 LET J=I-5

3140 ON J GOTO 3200,3300,3400, 3500

3200 LET B= -9.999999E36

3210 PRINT "-9.999999E36";

3220 GOTO 3600

3300 LET B= -9.9999899E36

3310 PRINT "-9.9999899E36";

3320 GOTO 3600

3400 LET B= -9.99998899E36

3410 PRINT "-9.99998899E36";

3420 GOTO 3600

3500 LET B= -9.999988899E36