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UZA is a logical format. The standard setting is NUZA (false).

UZA specifies that the U (undefined) is to be treated as Zero in arithmetic.

UZA is honoured in ivar and wvar definitions; it does not affect table manipulation.

For example:

dm $i1=u,

dm $i2=5,

di $ic1=$i1+$i2,

di $ic2=$i1-$i2,

di $ic3=$i1*$i2,

di $ic4=$i1/$i2,

with UZA $ic1 to $ic4 will have values of 5, -5, 0, 0 respectively. Without UZA they would all be U (undefined).

Note that divide by zero will not be errored with UZA; the result will be zero.