NAMELIST

Names a group of variables for I/O processing.

Syntax

NAMELIST /group-name/var-list [ [ ,]/group-name/var-list ]...

Description

The NAMELIST statement declares var-list as a namelist group and associates the group with group-name.

Variables appearing in var-list may be of any type, including objects of derived types or their components, saved variables, variables on the local stack, and subroutine parameters. The following, however, are not allowed:

The var-list explicitly defines which items may be read or written in a namelist-directed I/O statement. It is not necessary for every item in var-list to be defined in namelist-directed input, but every input item must belong to the namelist group. The order of items in var-list determines the order of the values written in namelist-directed output.

More than one NAMELIST statement with the same group-name may appear within the same scoping unit. Each successive var-list in multiple NAMELIST statements with the same group-name is treated as a continuation of the list for group-name.

The same variable name may appear in different NAMELIST statements within the same scoping unit.

Examples

PROGRAM
  INTEGER i, j(10)
  CHARACTER*10 c
  NAMELIST /n1/ i, j, c
  ! Define the namelist group n1
  READ (UNIT=5,NML=n1)
  WRITE (6, n1)
END

When this program is compiled and executed with the following input record:

&n1
j(8) = 6, 7, 8
i = 5c = 'xxxxxxxxx'
j = 5*0, -1, 2
c(2:6) = 'abcde'
/

its output is:

 &n1
 I      = 5
 J      = 0 0 0 0 0 -1 2 6 7 8
 C      ='xabcdexxx'
 /

Related statements

ACCEPT, OPEN, INQUIRE, PRINT, READ, and WRITE

Related concepts

Namelist-directed I/O is described in “Namelist-directed I/O”.