The Rounding environment variable controls the rounding of floating-point results.

There are five rounding modes available in Maple.

The value of Rounding is changed by using the assignment operator.  The default value of Rounding is nearest.

To determine the current value of Rounding during a Maple session, enter the command Rounding;.

The rounding mode determines the sign of 0 when it cannot be obtained otherwise.

Infinities always round to themselves, independent of the rounding value.

Maple fully evaluates environment variables such as Rounding. Because Rounding is an environment variable, any assignments to it inside a procedure body are undone upon exit from the procedure.

$\mathrm{Rounding}$

$\mathrm{nearest}$

f := proc()
    print( "Entering f. Rounding is", Rounding );
    Rounding := -infinity;
    print( "The current value of Rounding is", Rounding );
end proc:

$f\left(\right)$

$''Entering\; f.\; Rounding\; is'',\mathrm{nearest}$

$''The\; current\; value\; of\; Rounding\; is'',-\mathrm{\infty }$

$\mathrm{Rounding}$

$\mathrm{nearest}$

${1.4}^{10}$

$28.92546550$

$\mathrm{Rounding}≔0$

$\mathrm{Rounding}≔0$

${1.4}^{10}$

$28.92546549$

$\mathrm{Rounding}≔\mathrm{nearest}$

$\mathrm{Rounding}≔\mathrm{nearest}$

$2.-2.$

$0.$

$\mathrm{Rounding}≔-\mathrm{\infty }$

$\mathrm{Rounding}≔-\mathrm{\infty }$

$2.-2.$

$\mathrm{-0.}$