11.2.5 Logical Editing (L)

The L data edit descriptor transfers logical values. It takes the following form:

Lw

The specified I/O list item must be of type logical or integer.

The G edit descriptor can be used to edit logical data; it follows the same rules as Lw.

Rules for Input Processing

On input, the L data edit descriptor transfers w characters from an external field and assigns their logical value to the corresponding I/O list item. The value assigned depends on the external field data, as follows:

• .TRUE. is assigned if the first nonblank character is .T, T, .t, or t. The logical constant .TRUE. is an acceptable input form.
  
  
• .FALSE. is assigned if the first nonblank character is .F, F. .f, or f, or the entire field is filled with blanks. The logical constant .FALSE. is an acceptable input form.

If an other value appears in the external field, an error occurs.

Rules for Output Processing

On output, the L data edit descriptor transfers the following to an external field that is w characters long: w - 1 blanks, followed by a T or F (if the value is .TRUE. or .FALSE., respectively).

The following shows output using the L edit descriptor (the symbol ^ represents a nonprinting blank character):

Format     Value         Output
L5         .TRUE.        ^^^^T
L1         .FALSE.       F

For More Information:

For details on the general form for data edit descriptors, see Section 11.2.1.