bcsqrt


php128 apg

GET the square root of an arbitrary precision number.





This function returns Warning or Fatal error if $num < 0.

If $scale is omited, this function will default to the scale set globally with the bcscale function, or fallback to 0 if this has not been set.



<?php

string bcsqrt ( string $num, ?int $scale = null )


where,

$num = The operand as STRING

$scale = The number of decimal places 
                                to be considered in this operation

?> 

$num


The operand treated as STRING.



$scale


The number of decimal places to be considered.

This is nullable as of PHP 8.0.XX.



  1 EXERCISE   

<?php

function sqroot ($op01, $sc01)
{
if($op01 < 0)
{
    echo 'Square root of negative numbers is not defined.<br>';
}

{
    echo 'bcsqrt( ' . $op01 . ', ' . $sc01 . ' ) = '; 
                                    var_dump(bcsqrt( $op01, $sc01));
                                    echo '<br><br>';
}
}

sqroot(M_PI, 10);

sqroot(5, 6);

sqroot('5', 6);

sqroot(-5, 4);

sqroot(M_E, 8);

sqroot(0, 0);

?>