Intel fortran-80 manual More Specific Semantics Than 1977 FORTRAN, Differences From 1966 FORTRAN

Extensions To ANSI Fortran FORTRAN-SO

0.3 More Specific Semantics Than 1977 FORTRAN

In the following areas, the definition of FORTRAN-80 is more explicit than the AN- SI standard.

1.The character set and its collating sequence include the ASCII character set.

2.The standard length for real, integer, and logical type data is four bytes, but a particular processor can allow a different default size to be specified.

0.4 Differences From 1966 FORTRAN

The following lists summarize differences between 1966 ANSI FORTRAN and FORTRAN-80. Most differences represent additions to 1966 FORTRAN (except where indicated by an asterisk).

Data types:

Character constants, variables, and arrays

*No double precision constants, variables, arrays, or format specifiers *No complex constants, variables, arrays, or format specifiers Binary, octal, and hexadecimal notations for integer constants

Statements:

PROGRAM statement

BLOCK DATA statement with a subprogram name END statement with a label

IMPLICIT statement INTRINSIC statement SAVE statement

Block IF THEN, ELSE IF, ELSE, END IF PRINT statement

OPEN and CLOSE statements CHARACTER type statement

INTEGER and LOGICAL type statements with length specifications

Input/Output:

*No G edit descriptor

Control information list in READ, WRITE, BACKSPACE, ENDFILE, and REWIND statements

Asterisk as a unit identifier; character arrays and variables as internal units; in- teger expressions for external units

General expressions in WRITE, PRINT List-directed 110 (asterisk as format)

Character expression as format; Hollerith value in arithmetic array as format identifier

Edit descriptors BZ; BN, Ew.dEc j $, Bw, Zw General integer expressions in implied DOs

Expressions

Bit-wise Boolean operations on integers

.NEQV. and ,EQV.logical operators

Character expressions in assignments, output, relationals, and procedure arguments

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