Open Watcom FORTRAN 77 Language Reference

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Language Reference where: relop is a relational operator. e1, e2 are both arithmetic expressions or both character expressions. 7.3.2.1 Arithmetic Relational Expressions An arithmetic relational expression is a relational expression in which e1 and e2 are both arithmetic expressions. An arithmetic relational expression has a value of true if the operands satisfy the relation specified by the relational operator and false otherwise. A complex operand is only permitted when using either the .EQ. or .NE. relational operators. Watcom FORTRAN 77 allows operands of type COMPLEX*16. Open 7.3.2.2 Character Relational Expressions Character relational expressions are relational expressions whose operands are of type CHARACTER. The value of a relation between character strings is established by using the collating sequence of the processor character set. The collating sequence is an ordering of the characters in the processor character set. Note, for example, that the EBCDIC character set has a different collating sequence than that of the ASCII character set. For example, e1 is greater than e2 if the value of e1 follows the value of e2 in the processor collating sequence. The value of a character relational expression depends on the collating sequence. In the case of the .NE. and .EQ. operators, the collating sequence has no effect. Example: IF( ’A’ .LT. ’a’ )THEN PRINT *, ’The processor character set’ PRINT *, ’appears to be ASCII’ ELSE PRINT *, ’The processor character set’ PRINT *, ’appears to be EBCDIC’ END IF END The above example is a crude test for determining the character set used on your processor. It is possible to have operands of unequal length. In this case, the character string of smaller length is treated as if blanks were padded to the right of it to the length of the larger string. The relational operator is then applied. 7.4 Logical Expressions Logical expressions are used to describe computations involving operands whose type is LOGICAL or INTEGER , logical operators and left and right parentheses. The result of the computation is of type LOGICAL unless both operands are of type INTEGER in which case the result of the computation is of type INTEGER. 180 Logical Expressions
Expressions 7.4.1 Logical Operators The following table lists the logical operators and the operation they perform. Operator .NOT. .AND. .OR. .EQV. .NEQV. .XOR. Logical Operation Logical negation Logical conjunction Logical inclusive disjunction Logical equivalence Logical non-equivalence Exclusive or The logical operator .NOT. is a unary operator; all other logical operators are binary. The following tables describe the result of each operator when it is used with logical operands. x true false .NOT. x false true x y x .AND. y true true true true false false false true false false false false x y x .OR. y true true true true false true false true true false false false x y x .EQV. y true true true true false false false true false false false true x y x .NEQV. y ................ x .XOR. y true true false true false true false true true false false false Logical Expressions 181
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Open Watcom FORTRAN 77 Language Ref
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Preface Open Watcom FORTRAN 77 is a
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Table of Contents 2.25 ELSE IF Stat
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Table of Contents 3.4.10 Hexadecima
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Table of Contents 11.7 Editing ....
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Table of Contents 12.6.1 ENTRY Stat
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Language Reference 2
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Language Reference 1.3 Source Progr
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Language Reference Example: * From
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Language Reference 8 Order of FORTR
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Language Reference Statement 1 2 3
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Language Reference 2.3 ADMIT Statem
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Language Reference If there is a LO
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Language Reference 2.5 Statement La
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Language Reference 2.6 AT END State
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Language Reference The FORTRAN 77 s
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Language Reference 6. A named block
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Language Reference It is important
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Language Reference 2.11 CHARACTER S
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Language Reference If a symbolic na
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Language Reference Example: LOOP RE
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Language Reference Example: REAL A,
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Language Reference a (d) len is an
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Language Reference 2.15 CONTINUE St
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Language Reference 2.17 DATA Statem
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Language Reference 2. As an extensi
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Language Reference 2.18 DEALLOCATE
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Language Reference 2.19 DIMENSION S
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Language Reference Transfer of cont
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Language Reference Example: * Illeg
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Language Reference c r is a constan
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Language Reference c r is a constan
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Language Reference 2.24 ELSE Statem
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Language Reference 2.26 END Stateme
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Language Reference 2.28 END BLOCK S
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Language Reference 2.30 ENDFILE Sta
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Language Reference 2.31 END GUESS S
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Language Reference 2.33 END LOOP St
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Language Reference 2.35 END SELECT
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Language Reference 2.37 END UNION S
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Language Reference 2.39 ENTRY State
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Language Reference The following ex
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Language Reference 2.42 EXIT Statem
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Language Reference 2.44 FORMAT Stat
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Language Reference 2.45.2 Extended
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Language Reference 2.47 Computed GO
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Language Reference * Illegal use of
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Language Reference 2.50 Arithmetic
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Language Reference An example of an
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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 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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Page 142 and 143: Language Reference 2.71 RECORD Stat
Page 144 and 145: Language Reference 2.73 RETURN Stat
Page 146 and 147: Language Reference Notes: 1. The un
Page 148 and 149: Language Reference PROGRAM MAIN . .
Page 150 and 151: Language Reference Example: SELECT
Page 152 and 153: Language Reference 2.78 STRUCTURE S
Page 154 and 155: Language Reference 2.80 UNION State
Page 156 and 157: Language Reference 2.82 VOLATILE St
Page 158 and 159: Language Reference 2.84 WHILE State
Page 160 and 161: Language Reference REC = rn IOSTAT
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Page 164 and 165: Language Reference Example: DO10I=1
Page 166 and 167: Language Reference 123.764 .4352344
Page 168 and 169: Language Reference Actually, holler
Page 170 and 171: Language Reference 158 Symbolic Con
Page 172 and 173: Language Reference [lo:] hi where:
Page 174 and 175: Language Reference 4.4 Classifying
Page 176 and 177: Language Reference 4.5 Classifying
Page 178 and 179: Language Reference Example: CHARACT
Page 180 and 181: Language Reference STRUCTURE /PERSO
Page 182 and 183: Language Reference SUBROUTINE PRINT
Page 184 and 185: Language Reference 172 Unions
Page 186 and 187: Language Reference Operator Arithme
Page 188 and 189: Language Reference 7.1.3 Arithmetic
Page 190 and 191: Language Reference 7.2 Character Ex
Page 194 and 195: Language Reference Note that the op
Page 196 and 197: Language Reference 1. logical term
Page 198 and 199: Language Reference 186 Constant Exp
Page 200 and 201: Language Reference 8.3 Logical Assi
Page 202 and 203: Language Reference 8.6 Extended Ass
Page 204 and 205: Language Reference 192 Extended Ass
Page 206 and 207: Language Reference Examples follow
Page 208 and 209: Language Reference 9.4 DO - END DO
Page 210 and 211: Language Reference The next example
Page 212 and 213: Language Reference where: stmt is a
Page 214 and 215: Language Reference Example: * Illeg
Page 216 and 217: Language Reference - the string -10
Page 218 and 219: Language Reference 9.12 GUESS-ADMIT
Page 220 and 221: Language Reference 9.13 QUIT QUIT [
Page 222 and 223: Language Reference Example: LOOP RE
Page 224 and 225: Language Reference READ statement t
Page 226 and 227: Language Reference 214 Notes on Str
Page 228 and 229: Language Reference 10.3 Records FOR
Page 230 and 231: Language Reference accessed directl
Page 232 and 233: Language Reference Example: WRITE(1
Page 234 and 235: Language Reference 5. Any character
Page 236 and 237: Language Reference 224 Printing of
Page 238 and 239: Language Reference Example: REAL X
Page 240 and 241: 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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