Open Watcom FORTRAN 77 Language Reference

Table of Contents
Language Reference ........................................................................................................................................ 1
1 FORTRAN Source Program Format ................................................................................................ 3
1.1 Character Set ...................................................................................................................... 3
1.2 Extended Character Set ...................................................................................................... 3
1.3 Source Program Format ..................................................................................................... 4
1.3.1 Comment Line ..................................................................................................... 4
1.3.2 Debug Line (Extension) ....................................................................................... 4
1.3.3 Initial Line ........................................................................................................... 4
1.3.4 Continuation Line ................................................................................................ 4
1.3.5 Significance of the Blank Character .................................................................... 5
1.3.6 Significance of Lower Case Characters (Extension) ........................................... 5
1.3.7 Examples .............................................................................................................. 5
1.4 Order of FORTRAN Statements and Lines ....................................................................... 6
2 FORTRAN Statements ..................................................................................................................... 9
2.1 Classifying Statements ....................................................................................................... 9
2.2 FORTRAN Statement Summary ........................................................................................ 11
2.3 ADMIT Statement .............................................................................................................. 12
2.4 ALLOCATE Statement ...................................................................................................... 13
2.5 Statement Label Assignment (ASSIGN) Statement .......................................................... 16
2.6 AT END Statement ............................................................................................................ 18
2.7 BACKSPACE Statement ................................................................................................... 19
2.8 BLOCK DATA Statement ................................................................................................. 21
2.9 CALL Statement ................................................................................................................ 23
2.10 CASE Statement .............................................................................................................. 25
2.11 CHARACTER Statement ................................................................................................. 26
2.11.1 Standard CHARACTER Statement ................................................................... 26
2.11.2 Extended CHARACTER Statement: Data Initialization ................................... 28
2.12 CLOSE Statement ............................................................................................................ 29
2.13 COMMON Statement ...................................................................................................... 31
2.14 COMPLEX Statement ...................................................................................................... 33
2.14.1 Standard COMPLEX Statement ........................................................................ 33
2.14.2 Extended COMPLEX Statement: Length Specification .................................... 33
2.14.3 Extended COMPLEX Statement: Data Initialization ........................................ 34
2.15 CONTINUE Statement .................................................................................................... 36
2.16 CYCLE Statement ............................................................................................................ 37
2.17 DATA Statement .............................................................................................................. 38
2.18 DEALLOCATE Statement .............................................................................................. 42
2.19 DIMENSION Statement .................................................................................................. 44
2.20 DO Statement ................................................................................................................... 45
2.20.1 Standard DO Statement ..................................................................................... 45
2.20.2 Extended DO Statement .................................................................................... 45
2.20.3 Description of DO Statement ............................................................................ 45
2.21 DOUBLE COMPLEX Statement .................................................................................... 49
2.21.1 Simple DOUBLE COMPLEX Statement .......................................................... 49
2.21.2 DOUBLE COMPLEX Statement: Data Initialization ....................................... 49
2.22 DOUBLE PRECISION Statement ................................................................................... 51
2.22.1 Standard DOUBLE PRECISION Statement ..................................................... 51
2.22.2 Extended DOUBLE PRECISION Statement: Data Initialization ..................... 51
2.23 DO WHILE Statement ..................................................................................................... 53
2.24 ELSE Statement ............................................................................................................... 54
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