Open Watcom FORTRAN 77 Language Reference

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Language Reference 2. As an extension to FORTRAN 77, Open Watcom FORTRAN 77 permits an item of type character to be initialized with integer data. Example: CHARACTER C, D DATA C/65/, D/66/ END 3. Open Watcom FORTRAN 77 allows data initialization using hollerith constants. Initializing items using hollerith constants behaves in the same way as initializing items using character constants. Note that hollerith data can initialize entities of any type. See the chapter entitled "Names, Data Types and Constants" on page 151 for a description of hollerith constants. 4. Open Watcom FORTRAN 77 allows data initialization using hexadecimal or octal constants. Hexadecimal or octal constants can be used to initialize memory with any binary pattern. Items are initialized with hexadecimal constants in the following way. Two hexadecimal digits are required to initialize one byte of storage. If the number of characters in the hexadecimal constant is less than 2 times the number of bytes of storage allocated for the entity being initialized, the entity is padded on the left with zeroes. If the number of characters in the hexadecimal constant is greater than 2 times the number of bytes of storage allocated for the entity being initialized, the constant is truncated on the left to the size (in bytes) of the entity being initialized. Items are initialized with octal constants in the following way. Each octal digit initializes three bits of storage. If the number of digits in the octal constant times 3 is less than the number of bits of storage allocated for the entity being initialized, the entity is padded on the left with zero bits. If the number of digits in the octal constant times 3 is greater than the number of bits of storage allocated for the entity being initialized, bits are truncated on the left to the size (in bits) of the entity being initialized. Note that hexadecimal or octal data can initialize entities of any type. See the chapter entitled "Names, Data Types and Constants" on page 151 for a description of hexadecimal and octal constants. Example: DOUBLE PRECISION DPREC COMPLEX CMPLX * Initialize an integer variable with the value 5 DATA I/Z05/ * Initialize a real variable with the value 5.0 DATA X/Z41500000/ * Initialize a double precision variable * with the value 5D0 DATA DPREC/Z4150000000000000/ * Initialize a complex variable * with the value (5.0,5.0) DATA CMPLX/Z4150000041500000/ . . . END 40 DATA Statement
FORTRAN Statements Caution should be used when initializing items with hexadecimal constants, in particular those whose type is real or double precision, since the data they represent depends on the computer being used. In the previous example, the hexadecimal constant used to initialize the variable X, represents the number 5.0 on a computer with an IBM 370 architecture. The number 5.0 will have a different floating-point representation on other computers. DATA Statement 41
Page 1 and 2: Open Watcom FORTRAN 77 Language Ref
Page 3: Preface Open Watcom FORTRAN 77 is a
Page 6 and 7: Table of Contents 2.25 ELSE IF Stat
Page 8 and 9: Table of Contents 3.4.10 Hexadecima
Page 10 and 11: Table of Contents 11.7 Editing ....
Page 12 and 13: Table of Contents 12.6.1 ENTRY Stat
Page 14 and 15: Language Reference 2
Page 16 and 17: Language Reference 1.3 Source Progr
Page 18 and 19: Language Reference Example: * From
Page 20 and 21: Language Reference 8 Order of FORTR
Page 22 and 23: Language Reference Statement 1 2 3
Page 24 and 25: Language Reference 2.3 ADMIT Statem
Page 26 and 27: Language Reference If there is a LO
Page 28 and 29: Language Reference 2.5 Statement La
Page 30 and 31: Language Reference 2.6 AT END State
Page 32 and 33: Language Reference The FORTRAN 77 s
Page 34 and 35: Language Reference 6. A named block
Page 36 and 37: Language Reference It is important
Page 38 and 39: Language Reference 2.11 CHARACTER S
Page 40 and 41: Language Reference If a symbolic na
Page 42 and 43: Language Reference Example: LOOP RE
Page 44 and 45: Language Reference Example: REAL A,
Page 46 and 47: Language Reference a (d) len is an
Page 48 and 49: Language Reference 2.15 CONTINUE St
Page 50 and 51: Language Reference 2.17 DATA Statem
Page 54 and 55: Language Reference 2.18 DEALLOCATE
Page 56 and 57: Language Reference 2.19 DIMENSION S
Page 58 and 59: Language Reference Transfer of cont
Page 60 and 61: Language Reference Example: * Illeg
Page 62 and 63: Language Reference c r is a constan
Page 64 and 65: Language Reference c r is a constan
Page 66 and 67: Language Reference 2.24 ELSE Statem
Page 68 and 69: Language Reference 2.26 END Stateme
Page 70 and 71: Language Reference 2.28 END BLOCK S
Page 72 and 73: Language Reference 2.30 ENDFILE Sta
Page 74 and 75: Language Reference 2.31 END GUESS S
Page 76 and 77: Language Reference 2.33 END LOOP St
Page 78 and 79: Language Reference 2.35 END SELECT
Page 80 and 81: Language Reference 2.37 END UNION S
Page 82 and 83: Language Reference 2.39 ENTRY State
Page 84 and 85: Language Reference The following ex
Page 86 and 87: Language Reference 2.42 EXIT Statem
Page 88 and 89: Language Reference 2.44 FORMAT Stat
Page 90 and 91: Language Reference 2.45.2 Extended
Page 92 and 93: Language Reference 2.47 Computed GO
Page 94 and 95: Language Reference * Illegal use of
Page 96 and 97: Language Reference 2.50 Arithmetic
Page 98 and 99: Language Reference An example of an
Page 100 and 101: Language Reference IF( I .EQ. 10 )T
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Language Reference 2.53.3 IMPLICIT
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Language Reference 2.54 INCLUDE Sta
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Language Reference Example: LOGICAL
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Language Reference It is assigned t
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Language Reference 3. This specifie
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Language Reference a (d) len is an
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Language Reference 2.57 INTRINSIC S
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Language Reference 2.59 LOOP Statem
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Language Reference 2.61 NAMELIST St
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Language Reference Example: &PERSON
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Language Reference FILE = fin fin i
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Language Reference Notes: 1. If the
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Language Reference 2.64 PARAMETER S
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Language Reference 2.66 PRINT State
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Language Reference Example: PRINT 1
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Language Reference 2.68 QUIT Statem
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Language Reference 2. An internal f
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Language Reference Example: READ( 8
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Language Reference 2.71 RECORD Stat
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Language Reference 2.73 RETURN Stat
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Language Reference Notes: 1. The un
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Language Reference PROGRAM MAIN . .
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Language Reference Example: SELECT
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Language Reference 2.78 STRUCTURE S
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Language Reference 2.80 UNION State
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Language Reference 2.82 VOLATILE St
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Language Reference 2.84 WHILE State
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Language Reference REC = rn IOSTAT
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Language Reference 150
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Language Reference Example: DO10I=1
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Language Reference 123.764 .4352344
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Language Reference Actually, holler
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Language Reference 158 Symbolic Con
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Language Reference [lo:] hi where:
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Language Reference 4.4 Classifying
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Language Reference 4.5 Classifying
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Language Reference Example: CHARACT
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Language Reference STRUCTURE /PERSO
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Language Reference SUBROUTINE PRINT
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Language Reference 172 Unions
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Language Reference Operator Arithme
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Language Reference 7.1.3 Arithmetic
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Language Reference 7.2 Character Ex
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Language Reference where: relop is
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Language Reference Note that the op
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Language Reference 1. logical term
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Language Reference 186 Constant Exp
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Language Reference 8.3 Logical Assi
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Language Reference 8.6 Extended Ass
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Language Reference 192 Extended Ass
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Language Reference Examples follow
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Language Reference 9.4 DO - END DO
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Language Reference The next example
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Language Reference where: stmt is a
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Language Reference Example: * Illeg
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Language Reference - the string -10
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Language Reference 9.12 GUESS-ADMIT
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Language Reference 9.13 QUIT QUIT [
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Language Reference Example: LOOP RE
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Language Reference READ statement t
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Language Reference 214 Notes on Str
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Language Reference 10.3 Records FOR
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Language Reference accessed directl
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Language Reference Example: WRITE(1
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Language Reference 5. Any character
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Language Reference 224 Printing of
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Language Reference Example: REAL X
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Language Reference 11.6 Nonrepeatab
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Language Reference Example: PRINT
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Language Reference Example: INTEGER
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Language Reference 11.7.10.4 E and
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Language Reference n Example: is 4
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Language Reference and is read into
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Language Reference 3. An input item
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Language Reference 1. Blanks are ne
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Language Reference e is an expressi
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Language Reference Example: * Illeg
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Language Reference 12.3.2 Type Conv
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Language Reference 12.3.7 Type Conv
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Language Reference 12.3.13 Remainde
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Language Reference 12.3.18 Choosing
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Language Reference 12.3.24 Square R
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Language Reference 12.3.28 Sine Def
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Language Reference 12.3.33 Arccosin
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Language Reference 12.3.38 Gamma Fu
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Language Reference 12.3.45 Lexicall
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Language Reference Definition: Name
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Language Reference 12.3.53 Binary P
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Language Reference 12.3.58 Allocate
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Language Reference Example: INTEGER
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Language Reference 2. An array name
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Language Reference 5. A name that a
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Language Reference 12.8.1 Dummy Arg
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Language Reference Example: DIMENSI
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Language Reference 282 Subprogram A
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Appendices 284
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Appendices 10. The DOUBLE COMPLEX s
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Appendices 36. Non-character arrays
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Index AMAX1 253 AMIN0 254 $ AMIN1 2
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Index DATAN 260 dummy procedure 280
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Index AINT 250 ANINT 251 ASIN 259 H
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Index DREAL 249 IAND 264 DSIGN 252
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Index RETURN 32, 46, 56, 121, 132,
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Open Watcom FORTRAN 77 Language Reference

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