Why is a cast to int used in line 24? What does Math.sqrt return?

In Java, the method Math.sqrt(double a) returns a value of type double, which is the square root of the number a. If a cast to int occurs on line 24, it means that the result of Math.sqrt is being cast to an integer type, probably for use in a context where an integer is required (for example, an array index or an integer variable).

Example:

double root = Math.sqrt(10); // returns 3.1622776601683795
int intRoot = (int) Math.sqrt(10); // casts to 3, discarding the fractional part

Casting to int discards the fractional part without rounding, so it is important to understand that there is a loss of precision.