A relatively common operation to want to perform on floating point numbers is to find their square root.
You can do this with Math.sqrt.
~void main() {
double x = 4;
double y = Math.sqrt(x);
// This will output 2
System.out.println(y);
~}You need to write Math.sqrt and then inside of parentheses the expression whose value you want to take the square root of..
~void main() {
double x = 5;
double y = 13;
double z = Math.sqrt(9 * x + y);
// This will output 7.615773105863909
System.out.println(z);
~}If you try to take the square root of a negative number, the result will be NaN.
~void main() {
// will output NaN
System.out.println(Math.sqrt(-5.2));
~}