Sign Editing (SU, SP, SS, S)

The SU, SP, and S edit descriptors control leading signs for output. For normal output, without any specific sign specifiers, if a value is negative, a minus sign is printed in the first position to the left of the leftmost digit; if the value is positive, printing a plus sign depends on the implementation, but f77 omits the plus sign.

The following sign specifiers are available:

• SP--If SP precedes a specification, a sign is printed.

• SS--If SS precedes a specification, plus-sign printing is suppressed.

• S--If S precedes a specification, the system default is restored. The default is SS.

• SU--If SU precedes a specification, integer values are interpreted as unsigned. This is nonstandard. @

For example, the unsigned specifier can be used with the radix specifier to format a hexadecimal dump, as follows:

2000 	FORMAT( SU, 16R, 8I10.8 ) 

The rules and restrictions for sign control are:

• Sign-control specifiers apply to output only.

• A sign-control specifier remains in effect until another sign-control specifier is encountered, or format interpretation is complete.

• The S, SP, and SS specifiers affect only I, F, E, D, and G editing.

• The SU specifier affects only I editing.