Open Watcom FORTRAN 77 Language Reference

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Language Reference 5. A name that appears as a dummy argument in an ENTRY statement must not appear in an executable statement preceding the ENTRY statement unless it has also appeared in a FUNCTION, SUBROUTINE, or ENTRY statement that precedes the executable statement. 12.7 The RETURN Statement A RETURN statement is a way to terminate the execution of a function or subroutine subprogram and return control to the program unit that referenced it. As an extension to FORTRAN 77, Open Watcom FORTRAN 77 permits the use of the RETURN statement in the main program. A subprogram (or main program) may contain more than one RETURN statement or it may contain no RETURN statement. In the latter case, the END statement has the same effect as a RETURN statement. Execution of a RETURN or END statement causes all local entities to become undefined except for the following. 1. Entities specified in a SAVE statement. 2. Entities in blank common. 3. Initially defined entities that have neither been redefined nor become undefined. 4. Entities in a named common block that appears in the subprogram and in a program unit that references the subprogram directly or indirectly. 12.7.1 RETURN Statement in the Main Program (Extension) The form of a RETURN statement in a main program is: RETURN When a RETURN statement is executed in the main program, program execution terminates in the same manner as the STOP or END statement. This is an extension to FORTRAN 77. 12.7.2 RETURN Statement in Function Subprograms The form of a RETURN statement in a function subprogram is: RETURN When a RETURN statement is executed in a function subprogram, the function value must be defined. Control is then passed back to the program unit that referenced it. 276 The RETURN Statement
Functions and Subroutines 12.7.3 RETURN Statement in Subroutine Subprograms The form of a RETURN statement in a subroutine subprogram is: RETURN [ e ] where: e is an integer expression. If the expression e is omitted or has a value less than one or greater than the number of asterisks appearing in the dummy argument list of the subroutine or entry name referenced, then control is returned to the next executable statement that follows the CALL statement in the referencing program unit. If 1
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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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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
Page 238 and 239: Language Reference Example: REAL X
Page 240 and 241: Language Reference 11.6 Nonrepeatab
Page 242 and 243: Language Reference Example: PRINT
Page 244 and 245: Language Reference Example: INTEGER
Page 246 and 247: Language Reference 11.7.10.4 E and
Page 248 and 249: Language Reference n Example: is 4
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Page 260 and 261: Language Reference 12.3.2 Type Conv
Page 262 and 263: Language Reference 12.3.7 Type Conv
Page 264 and 265: Language Reference 12.3.13 Remainde
Page 266 and 267: Language Reference 12.3.18 Choosing
Page 268 and 269: Language Reference 12.3.24 Square R
Page 270 and 271: Language Reference 12.3.28 Sine Def
Page 272 and 273: Language Reference 12.3.33 Arccosin
Page 274 and 275: Language Reference 12.3.38 Gamma Fu
Page 276 and 277: Language Reference 12.3.45 Lexicall
Page 278 and 279: Language Reference Definition: Name
Page 280 and 281: Language Reference 12.3.53 Binary P
Page 282 and 283: Language Reference 12.3.58 Allocate
Page 284 and 285: Language Reference Example: INTEGER
Page 286 and 287: Language Reference 2. An array name
Page 290 and 291: Language Reference 12.8.1 Dummy Arg
Page 292 and 293: Language Reference Example: DIMENSI
Page 294 and 295: Language Reference 282 Subprogram A
Page 296 and 297: Appendices 284
Page 298 and 299: Appendices 10. The DOUBLE COMPLEX s
Page 300 and 301: Appendices 36. Non-character arrays
Page 303 and 304: Index AMAX1 253 AMIN0 254 $ AMIN1 2
Page 305 and 306: Index DATAN 260 dummy procedure 280
Page 307 and 308: Index AINT 250 ANINT 251 ASIN 259 H
Page 309 and 310: Index DREAL 249 IAND 264 DSIGN 252
Page 311 and 312: Index RETURN 32, 46, 56, 121, 132,
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