Fill processing is performed on output whenever the data, after being formatted for presentation, is shorter than the presentation area. The defined fill character is added to the formatted data to make it the same length as the presentation area. Fill characters are added before, after, or before and after the formatted results.
Fill characters also are removed from the presentation area when the presentation space is read. This is done to obtain the significant data for editing. Input fill processing reverses the operations performed on the data during output fill processing.
Fill processing is related to justification. The operation on the fill characters and the presentation space depends on the justification modes in effect.
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