For all intrinsic procedures, the arguments shown are the names you must use as keywords when using the keyword form for actual arguments. For example, a reference to function CMPLX (X, Y, KIND) can be written as follows:
| Using positional arguments: | CMPLX (F, G, L) |
| Using argument keywords: | CMPLX (KIND=L, Y=G, X=F) 1 |
| 1 Note that argument keywords can be written in any order. | |
Some argument keywords are optional (denoted by square brackets). The following describes some of the most commonly used optional arguments:
| BACK | Specifies that a string scan is to be in reverse order (right to left). |
| DIM | Specifies a selected dimension of an array argument. |
| KIND | Specifies the kind type parameter of the function result. |
| MASK | Specifies that a mask can be applied to the elements of the argument array to exclude the elements that are not to be involved in an operation. |
Examples
The syntax for the DATE_AND_TIME intrinsic subroutine shows four optional positional arguments: DATE, TIME, ZONE, and VALUES (see Section 9.3.36).
The following shows some valid ways to specify these arguments:
! Keyword example
CALL DATE_AND_TIME (ZONE=Z)
! The following two positional examples are equivalent:
CALL DATE_AND_TIME (DATE, TIME, ZONE)
CALL DATE_AND_TIME (, , ZONE)
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