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|
INTEGER FUNCTION I1MACH(I)
C
C I/O UNIT NUMBERS.
C
C I1MACH( 1) = THE STANDARD INPUT UNIT.
C
C I1MACH( 2) = THE STANDARD OUTPUT UNIT.
C
C I1MACH( 3) = THE STANDARD PUNCH UNIT.
C
C I1MACH( 4) = THE STANDARD ERROR MESSAGE UNIT.
C
C WORDS.
C
C I1MACH( 5) = THE NUMBER OF BITS PER INTEGER STORAGE UNIT.
C
C I1MACH( 6) = THE NUMBER OF CHARACTERS PER CHARACTER STORAGE UNIT.
C FOR FORTRAN 77, THIS IS ALWAYS 1. FOR FORTRAN 66,
C CHARACTER STORAGE UNIT = INTEGER STORAGE UNIT.
C
C INTEGERS.
C
C ASSUME INTEGERS ARE REPRESENTED IN THE S-DIGIT, BASE-A FORM
C
C SIGN ( X(S-1)*A**(S-1) + ... + X(1)*A + X(0) )
C
C WHERE 0 .LE. X(I) .LT. A FOR I=0,...,S-1.
C
C I1MACH( 7) = A, THE BASE.
C
C I1MACH( 8) = S, THE NUMBER OF BASE-A DIGITS.
C
C I1MACH( 9) = A**S - 1, THE LARGEST MAGNITUDE.
C
C FLOATING-POINT NUMBERS.
C
C ASSUME FLOATING-POINT NUMBERS ARE REPRESENTED IN THE T-DIGIT,
C BASE-B FORM
C
C SIGN (B**E)*( (X(1)/B) + ... + (X(T)/B**T) )
C
C WHERE 0 .LE. X(I) .LT. B FOR I=1,...,T,
C 0 .LT. X(1), AND EMIN .LE. E .LE. EMAX.
C
C I1MACH(10) = B, THE BASE.
C
C SINGLE-PRECISION
C
C I1MACH(11) = T, THE NUMBER OF BASE-B DIGITS.
C
C I1MACH(12) = EMIN, THE SMALLEST EXPONENT E.
C
C I1MACH(13) = EMAX, THE LARGEST EXPONENT E.
C
C DOUBLE-PRECISION
C
C I1MACH(14) = T, THE NUMBER OF BASE-B DIGITS.
C
C I1MACH(15) = EMIN, THE SMALLEST EXPONENT E.
C
C I1MACH(16) = EMAX, THE LARGEST EXPONENT E.
C
C TO ALTER THIS FUNCTION FOR A PARTICULAR ENVIRONMENT,
C THE DESIRED SET OF DATA STATEMENTS SHOULD BE ACTIVATED BY
C REMOVING THE C FROM COLUMN 1. ALSO, THE VALUES OF
C I1MACH(1) - I1MACH(4) SHOULD BE CHECKED FOR CONSISTENCY
C WITH THE LOCAL OPERATING SYSTEM. FOR FORTRAN 77, YOU MAY WISH
C TO ADJUST THE DATA STATEMENT SO IMACH(6) IS SET TO 1, AND
C THEN TO COMMENT OUT THE EXECUTABLE TEST ON I .EQ. 6 BELOW.
C
C FOR IEEE-ARITHMETIC MACHINES (BINARY STANDARD), THE FIRST
C SET OF CONSTANTS BELOW SHOULD BE APPROPRIATE, EXCEPT PERHAPS
C FOR IMACH(1) - IMACH(4).
C
C COMMENTS JUST BEFORE THE END STATEMENT (LINES STARTING WITH *)
C GIVE C SOURCE FOR I1MACH.
C
INTEGER IMACH(16), OUTPUT, SMALL(2), I
C/6S
C/7S
SAVE IMACH
C/
REAL RMACH
C
EQUIVALENCE (IMACH(4),OUTPUT), (RMACH,SMALL(1))
C
C MACHINE CONSTANTS FOR IEEE ARITHMETIC MACHINES, SUCH AS THE AT&T
C 3B SERIES, MOTOROLA 68000 BASED MACHINES (E.G. SUN 3 AND AT&T
C PC 7300), AND 8087 BASED MICROS (E.G. IBM PC AND AT&T 6300).
C
DATA IMACH( 1) / 5 /
DATA IMACH( 2) / 6 /
DATA IMACH( 3) / 7 /
DATA IMACH( 4) / 6 /
DATA IMACH( 5) / 32 /
DATA IMACH( 6) / 4 /
DATA IMACH( 7) / 2 /
DATA IMACH( 8) / 31 /
DATA IMACH( 9) / 2147483647 /
DATA IMACH(10) / 2 /
DATA IMACH(11) / 24 /
DATA IMACH(12) / -125 /
DATA IMACH(13) / 128 /
DATA IMACH(14) / 53 /
DATA IMACH(15) / -1021 /
DATA IMACH(16) / 1024 /
C
C MACHINE CONSTANTS FOR AMDAHL MACHINES.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / 2147483647 /
C DATA IMACH(10) / 16 /
C DATA IMACH(11) / 6 /
C DATA IMACH(12) / -64 /
C DATA IMACH(13) / 63 /
C DATA IMACH(14) / 14 /
C DATA IMACH(15) / -64 /
C DATA IMACH(16) / 63 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE BURROUGHS 1700 SYSTEM.
C
C DATA IMACH( 1) / 7 /
C DATA IMACH( 2) / 2 /
C DATA IMACH( 3) / 2 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 36 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 33 /
C DATA IMACH( 9) / Z1FFFFFFFF /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 24 /
C DATA IMACH(12) / -256 /
C DATA IMACH(13) / 255 /
C DATA IMACH(14) / 60 /
C DATA IMACH(15) / -256 /
C DATA IMACH(16) / 255 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE BURROUGHS 5700 SYSTEM.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 48 /
C DATA IMACH( 6) / 6 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 39 /
C DATA IMACH( 9) / O0007777777777777 /
C DATA IMACH(10) / 8 /
C DATA IMACH(11) / 13 /
C DATA IMACH(12) / -50 /
C DATA IMACH(13) / 76 /
C DATA IMACH(14) / 26 /
C DATA IMACH(15) / -50 /
C DATA IMACH(16) / 76 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE BURROUGHS 6700/7700 SYSTEMS.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 48 /
C DATA IMACH( 6) / 6 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 39 /
C DATA IMACH( 9) / O0007777777777777 /
C DATA IMACH(10) / 8 /
C DATA IMACH(11) / 13 /
C DATA IMACH(12) / -50 /
C DATA IMACH(13) / 76 /
C DATA IMACH(14) / 26 /
C DATA IMACH(15) / -32754 /
C DATA IMACH(16) / 32780 /, SANITY/987/
C
C MACHINE CONSTANTS FOR FTN4 ON THE CDC 6000/7000 SERIES.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 60 /
C DATA IMACH( 6) / 10 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 48 /
C DATA IMACH( 9) / 00007777777777777777B /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 47 /
C DATA IMACH(12) / -929 /
C DATA IMACH(13) / 1070 /
C DATA IMACH(14) / 94 /
C DATA IMACH(15) / -929 /
C DATA IMACH(16) / 1069 /, SANITY/987/
C
C MACHINE CONSTANTS FOR FTN5 ON THE CDC 6000/7000 SERIES.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 60 /
C DATA IMACH( 6) / 10 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 48 /
C DATA IMACH( 9) / O"00007777777777777777" /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 47 /
C DATA IMACH(12) / -929 /
C DATA IMACH(13) / 1070 /
C DATA IMACH(14) / 94 /
C DATA IMACH(15) / -929 /
C DATA IMACH(16) / 1069 /, SANITY/987/
C
C MACHINE CONSTANTS FOR CONVEX C-1.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / 2147483647 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 24 /
C DATA IMACH(12) / -128 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 53 /
C DATA IMACH(15) /-1024 /
C DATA IMACH(16) / 1023 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE CRAY 1, XMP, 2, AND 3.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 102 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 64 /
C DATA IMACH( 6) / 8 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 63 /
C DATA IMACH( 9) / 777777777777777777777B /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 47 /
C DATA IMACH(12) / -8189 /
C DATA IMACH(13) / 8190 /
C DATA IMACH(14) / 94 /
C DATA IMACH(15) / -8099 /
C DATA IMACH(16) / 8190 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE DATA GENERAL ECLIPSE S/200.
C
C DATA IMACH( 1) / 11 /
C DATA IMACH( 2) / 12 /
C DATA IMACH( 3) / 8 /
C DATA IMACH( 4) / 10 /
C DATA IMACH( 5) / 16 /
C DATA IMACH( 6) / 2 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 15 /
C DATA IMACH( 9) /32767 /
C DATA IMACH(10) / 16 /
C DATA IMACH(11) / 6 /
C DATA IMACH(12) / -64 /
C DATA IMACH(13) / 63 /
C DATA IMACH(14) / 14 /
C DATA IMACH(15) / -64 /
C DATA IMACH(16) / 63 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE HARRIS SLASH 6 AND SLASH 7.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 0 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 24 /
C DATA IMACH( 6) / 3 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 23 /
C DATA IMACH( 9) / 8388607 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 23 /
C DATA IMACH(12) / -127 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 38 /
C DATA IMACH(15) / -127 /
C DATA IMACH(16) / 127 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE HONEYWELL DPS 8/70 SERIES.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 43 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 36 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 35 /
C DATA IMACH( 9) / O377777777777 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 27 /
C DATA IMACH(12) / -127 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 63 /
C DATA IMACH(15) / -127 /
C DATA IMACH(16) / 127 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE IBM 360/370 SERIES,
C THE XEROX SIGMA 5/7/9 AND THE SEL SYSTEMS 85/86.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / Z7FFFFFFF /
C DATA IMACH(10) / 16 /
C DATA IMACH(11) / 6 /
C DATA IMACH(12) / -64 /
C DATA IMACH(13) / 63 /
C DATA IMACH(14) / 14 /
C DATA IMACH(15) / -64 /
C DATA IMACH(16) / 63 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE INTERDATA 8/32
C WITH THE UNIX SYSTEM FORTRAN 77 COMPILER.
C
C FOR THE INTERDATA FORTRAN VII COMPILER REPLACE
C THE Z'S SPECIFYING HEX CONSTANTS WITH Y'S.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 6 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / Z'7FFFFFFF' /
C DATA IMACH(10) / 16 /
C DATA IMACH(11) / 6 /
C DATA IMACH(12) / -64 /
C DATA IMACH(13) / 62 /
C DATA IMACH(14) / 14 /
C DATA IMACH(15) / -64 /
C DATA IMACH(16) / 62 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE PDP-10 (KA PROCESSOR).
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 36 /
C DATA IMACH( 6) / 5 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 35 /
C DATA IMACH( 9) / "377777777777 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 27 /
C DATA IMACH(12) / -128 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 54 /
C DATA IMACH(15) / -101 /
C DATA IMACH(16) / 127 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE PDP-10 (KI PROCESSOR).
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 36 /
C DATA IMACH( 6) / 5 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 35 /
C DATA IMACH( 9) / "377777777777 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 27 /
C DATA IMACH(12) / -128 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 62 /
C DATA IMACH(15) / -128 /
C DATA IMACH(16) / 127 /, SANITY/987/
C
C MACHINE CONSTANTS FOR PDP-11 FORTRANS SUPPORTING
C 32-BIT INTEGER ARITHMETIC.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / 2147483647 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 24 /
C DATA IMACH(12) / -127 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 56 /
C DATA IMACH(15) / -127 /
C DATA IMACH(16) / 127 /, SANITY/987/
C
C MACHINE CONSTANTS FOR PDP-11 FORTRANS SUPPORTING
C 16-BIT INTEGER ARITHMETIC.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 16 /
C DATA IMACH( 6) / 2 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 15 /
C DATA IMACH( 9) / 32767 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 24 /
C DATA IMACH(12) / -127 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 56 /
C DATA IMACH(15) / -127 /
C DATA IMACH(16) / 127 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE PRIME 50 SERIES SYSTEMS
C WTIH 32-BIT INTEGERS AND 64V MODE INSTRUCTIONS,
C SUPPLIED BY IGOR BRAY.
C
C DATA IMACH( 1) / 1 /
C DATA IMACH( 2) / 1 /
C DATA IMACH( 3) / 2 /
C DATA IMACH( 4) / 1 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / :17777777777 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 23 /
C DATA IMACH(12) / -127 /
C DATA IMACH(13) / +127 /
C DATA IMACH(14) / 47 /
C DATA IMACH(15) / -32895 /
C DATA IMACH(16) / +32637 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE SEQUENT BALANCE 8000.
C
C DATA IMACH( 1) / 0 /
C DATA IMACH( 2) / 0 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 0 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 1 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / 2147483647 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 24 /
C DATA IMACH(12) / -125 /
C DATA IMACH(13) / 128 /
C DATA IMACH(14) / 53 /
C DATA IMACH(15) / -1021 /
C DATA IMACH(16) / 1024 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE UNIVAC 1100 SERIES.
C
C NOTE THAT THE PUNCH UNIT, I1MACH(3), HAS BEEN SET TO 7
C WHICH IS APPROPRIATE FOR THE UNIVAC-FOR SYSTEM.
C IF YOU HAVE THE UNIVAC-FTN SYSTEM, SET IT TO 1.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 36 /
C DATA IMACH( 6) / 6 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 35 /
C DATA IMACH( 9) / O377777777777 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 27 /
C DATA IMACH(12) / -128 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 60 /
C DATA IMACH(15) /-1024 /
C DATA IMACH(16) / 1023 /, SANITY/987/
C
C MACHINE CONSTANTS FOR VAX.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / 2147483647 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 24 /
C DATA IMACH(12) / -127 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 56 /
C DATA IMACH(15) / -127 /
C DATA IMACH(16) / 127 /, SANITY/987/
C
C *** ISSUE STOP 775 IF ALL DATA STATEMENTS ARE COMMENTED...
C IF (SANITY .NE. 987) THEN
C* *** CHECK FOR AUTODOUBLE ***
C SMALL(2) = 0
C RMACH = 1E13
C IF (SMALL(2) .NE. 0) THEN
C* *** AUTODOUBLED ***
C IF ( (SMALL(1) .EQ. 1117925532
C * .AND. SMALL(2) .EQ. -448790528)
C * .OR. (SMALL(2) .EQ. 1117925532
C * .AND. SMALL(1) .EQ. -448790528)) THEN
C* *** IEEE ***
C IMACH(10) = 2
C IMACH(14) = 53
C IMACH(15) = -1021
C IMACH(16) = 1024
C ELSE IF ( SMALL(1) .EQ. -2065213935
C * .AND. SMALL(2) .EQ. 10752) THEN
C* *** VAX WITH D_FLOATING ***
C IMACH(10) = 2
C IMACH(14) = 56
C IMACH(15) = -127
C IMACH(16) = 127
C ELSE IF ( SMALL(1) .EQ. 1267827943
C * .AND. SMALL(2) .EQ. 704643072) THEN
C* *** IBM MAINFRAME ***
C IMACH(10) = 16
C IMACH(14) = 14
C IMACH(15) = -64
C IMACH(16) = 63
C ELSE
C WRITE(*,*)'Adjust autodoubled I1MACH by uncommenting'
C WRITE(*,*)'data statements appropriate for your machine'
C WRITE(*,*)'and setting IMACH(I) = IMACH(I+3) for'
C WRITE(*,*)'I = 11, 12, and 13.'
C STOP 777
C END IF
C IMACH(11) = IMACH(14)
C IMACH(12) = IMACH(15)
C IMACH(13) = IMACH(16)
C ELSE
C RMACH = 1234567.
C IF (SMALL(1) .EQ. 1234613304) THEN
C* *** IEEE ***
C IMACH(10) = 2
C IMACH(11) = 24
C IMACH(12) = -125
C IMACH(13) = 128
C IMACH(14) = 53
C IMACH(15) = -1021
C IMACH(16) = 1024
C SANITY = 987
C ELSE IF (SMALL(1) .EQ. -1271379306) THEN
C* *** VAX ***
C IMACH(10) = 2
C IMACH(11) = 24
C IMACH(12) = -127
C IMACH(13) = 127
C IMACH(14) = 56
C IMACH(15) = -127
C IMACH(16) = 127
C SANITY = 987
C ELSE IF (SMALL(1) .EQ. 1175639687) THEN
C* *** IBM ***
C IMACH(10) = 16
C IMACH(11) = 6
C IMACH(12) = -64
C IMACH(13) = 63
C IMACH(14) = 14
C IMACH(15) = -64
C IMACH(16) = 63
C SANITY = 987
C ELSE
C WRITE(*,*)'Adjust I1MACH by uncommenting'
C WRITE(*,*)'data statements appropriate for your machine.'
C STOP 777
C END IF
C END IF
C IMACH( 1) = 5
C IMACH( 2) = 6
C IMACH( 3) = 7
C IMACH( 4) = 6
C IMACH( 5) = 32
C IMACH( 6) = 4
C IMACH( 7) = 2
C IMACH( 8) = 31
C IMACH( 9) = 2147483647
C SANITY = 987
C END IF
C IF (I .LT. 1 .OR. I .GT. 16) GO TO 30
IF (I .LT. 1 .OR. I .GT. 16) THEN
I1MACH = -1
RETURN
END IF
C
I1MACH = IMACH(I)
C/6S
C/7S
IF (I .EQ. 6) I1MACH = 1
C/
RETURN
C
C 30 WRITE(*,*) 'I1MACH(I): I =',I,' is out of bounds.'
C
C* CALL FDUMP
C
C STOP
C
C* /* C source for I1MACH -- remove the * in column 1 */
C* /* Note that some values may need changing -- see the comments below. */
C*#include <stdio.h>
C*#include <float.h>
C*#include <limits.h>
C*#include <math.h>
C*
C*long i1mach_(long *i)
C*{
C* switch(*i){
C* case 1: return 5; /* standard input unit -- may need changing */
C* case 2: return 6; /* standard output unit -- may need changing */
C* case 3: return 7; /* standard punch unit -- may need changing */
C* case 4: return 0; /* standard error unit -- may need changing */
C* case 5: return 32; /* bits per integer -- may need changing */
C* case 6: return 1; /* Fortran 77 value: 1 character */
C* /* per character storage unit */
C* case 7: return 2; /* base for integers -- may need changing */
C* case 8: return 31; /* digits of integer base -- may need changing */
C* case 9: return LONG_MAX;
C* case 10: return FLT_RADIX;
C* case 11: return FLT_MANT_DIG;
C* case 12: return FLT_MIN_EXP;
C* case 13: return FLT_MAX_EXP;
C* case 14: return DBL_MANT_DIG;
C* case 15: return DBL_MIN_EXP;
C* case 16: return DBL_MAX_EXP;
C* }
C*
C* fprintf(stderr, "invalid argument: i1mach(%ld)\n", *i);
C* exit(1);
C* return 0; /* for compilers that complain of missing return values */
C* }
END
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