10 PRINT "PROGRAM FILE 119: ACCURACY OF ATN FUNCTION." 20 PRINT " ANSI STANDARD 7.6, 8.4" 30 PRINT 40 PRINT "SECTION 119.1: ACCURACY OF ATN FUNCTION." 50 PRINT 60 PRINT "THIS PROGRAM TESTS VALUES RETURNED BY INVOCATIONS OF THE" 70 PRINT "ATN FUNCTION FOR ACCURACY. THE INVOCATION MUST RETURN," 80 PRINT "ACCURATE TO SIX DIGITS, SOME VALUE ACTUALLY TAKEN ON BY" 90 PRINT "THE FUNCTION WITHIN A DOMAIN BOUNDED BY THE ACTUAL ARGUMENT" 100 PRINT "PLUS OR MINUS ONE IN THE SIXTH DIGIT. ALSO, AN" 110 PRINT "'ERROR MEASURE' IS COMPUTED AND REPORTED. THIS MEASURE" 120 PRINT "IS JUST 2 * THE ABSOLUTE ERROR OVER THE SIZE OF THE RANGE;" 130 PRINT "THUS, A VALUE JUST BARELY PASSING OR FAILING WILL USUALLY" 140 PRINT "HAVE A MEASURE OF ABOUT 1. A VALUE 3 TIMES" 150 PRINT "AS INACCURATE AS EXPECTED WILL HAVE A MEASURE OF 3-" 160 PRINT 170 PRINT "THIS TEST IS INFORMATIVE ONLY, SINCE THE ANSI STANDARD" 180 PRINT "DOES NOT MANDATE ANY ACCURACY FOR SUPPLIED-FUNCTIONS." 190 PRINT 200 PRINT " BEGIN TEST" 210 PRINT 220 PRINT "ARGUMENT","TRUE","COMPUTED","ERROR","OUTCOME" 230 PRINT " ","VALUE","VALUE","MEASURE" 240 PRINT 250 LET F=0 260 READ A,T,L,H 270 IF A=999 THEN 2000 280 LET C=ATN(A) 290 IF C=T THEN 333 300 IF CH THEN 444 320 LET O$=" OK " 330 GOTO 500 333 LET O$=" OK - EXACT" 340 GOTO 500 444 LET O$="FAIL" 445 LET F=F+1 450 GOTO 500 500 LET R=H-L 510 IF R=0 THEN 700 520 LET E=ABS((C-T)/R) 525 LET E=E+E 530 PRINT A,T,C,E,O$ 540 GOTO 260 700 PRINT A,T,C,"RANGE ZERO",O$ 710 GOTO 260 2000 PRINT 2010 IF F=0 THEN 2100 2020 PRINT "*** INFORMATIVE TEST FAILED IN ";F;" CASE(S) ***" 2030 GOTO 2110 2100 PRINT "*** INFORMATIVE TEST PASSED ***" 2110 PRINT 2120 PRINT " END TEST" 2130 PRINT 2140 PRINT "END PROGRAM 119" 3000 DATA 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