This variable applies only to object files generated with ACUCOBOL-85 Version 1.5 and earlier. For later object files, use the "-Zz" compiler option. When SPACES_ZERO is "1" (on, true, yes), it alters the method in which USAGE DISPLAY data items are used by the runtime system. The main effect is that, in most cases, a data item containing spaces is treated as if it contained zeros. Note that this may not occur in all instances because the ACUCOBOL-GT compiler may construct code that directly acts on a data item without first converting it to a number. The default value is "0" (off, false, no).