Square Root

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.

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..

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.

// will output NaN
System.out.println(Math.sqrt(-5.2));