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.TH ZSUB 3 libzahl
.SH NAME
zsub - Calculate the difference of two big integer
.SH SYNOPSIS
.nf
#include <zahl.h>
void zsub(z_t \fIdifference\fP, z_t \fIminuend\fP, z_t \fIsubtrahend\fP);
.fi
.SH DESCRIPTION
.B zsub
calculates the difference of a
.I minuend
and a
.IR subtrahend ,
and stores the result in
.IR difference .
That is,
.I difference
gets
.I minuend
-
.IR subtrahend .
.P
It is safe to call
.B zsub
with non-unique parameters.
.SH SEE ALSO
.BR zstr (3),
.BR zadd (3),
.BR zmul (3),
.BR zdiv (3),
.BR zmod (3),
.BR zneg (3),
.BR zabs (3),
.BR zpow (3)
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