The Digits environment variable controls the number of digits that Maple uses when making calculations with software floating-point numbers.

The default value of Digits is 10. The value of Digits is changed by using the assignment operator.

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

The maximum value of Digits is obtained from kernelopts(maxdigits).

The interface(displayprecision) command controls the number of decimal places to be displayed, which is determined by Digits. This allows for simplification of display without introducing round-off error.

$\mathrm{Digits}≔20$

$\mathrm{Digits}≔20$

f := proc()
    print( "Entering f. Digits is", Digits );
    Digits := Digits + 17;
    print( "Adding 17 to Digits yields", Digits );
end proc:

$f\left(\right)$

$''Entering\; f.\; Digits\; is'',20$

$''Adding\; 17\; to\; Digits\; yields'',37$

$\mathrm{Digits}$

$20$

${1.02}^{10}$

$1.2189944199947571302$

$\mathrm{Digits}≔5$

$\mathrm{Digits}≔5$

${1.02}^{10}$

$1.2190$

$\mathrm{interface}\left(\mathrm{displayprecision}=5\right)$

$\mathrm{-1}$

$\mathrm{Digits}≔20$

$\mathrm{Digits}≔20$

$a≔\mathrm{evalf}\left(\frac{1}{3}\right)$

$a≔0.33333$

$a\cdot 3$

$1.00000$