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Extra info for Fortran 77 4.0 Reference Manual
Sample text
In general, if a statement specifies an action to be taken at runtime, it is executable. Otherwise, it is nonexecutable. The nonexecutable statements specify attributes, such as type and size; determine arrangement or order; define initial data values; specify editing instructions; define statement functions; classify program units; and define entry points. In general, nonexecutable statements are completed before execution of the first executable statement. Elements of FORTRAN 77 7 1 FORTRAN 77 Statements Table 1-5 The asterisk (*) ACCEPT* indicates an ASSIGN* executable statement.
Or * In any column, the ! comment-indicator character The next 7 characters are $PRAGMA, no blanks, any uppercase or lowercase Rules and Restrictions After the first eight characters, blanks are ignored, and uppercase and lowercase are equivalent, as in FORTRAN 77 text. Because it is a comment, a directive cannot be continued, but you can have many C$PRAGMA lines, one after the other, as needed. If a comment satisfies the above syntax, it is expected to contain one or more directives recognized by the compiler; if it does not, a warning is issued.
The doubleprecision data type, DOUBLE PRECISION, which has the synonym, REAL*8, holds one double-precision datum. The default size for DOUBLE PRECISION with no size specified is 8. If the –r8 compiler option is set, then the default size is 16; otherwise, 8. 18 FORTRAN 77 Reference Manual 2 DOUBLE PRECISION is aligned on 4-byte boundaries. A DOUBLE PRECISION element has a sign bit, an 11-bit exponent, and a 52-bit fraction. These DOUBLE PRECISION elements in f77 conform to the IEEE standard for double-precision floating-point data.