Question

I’m making a method that’s supposed to do the same as Math.pow(), but I just can’t figure out how to make it possible to use double values for y and get a double value result with decimals…. Any ideas (preferably using a for-loop)? In the method below I used “x” as the base and “y” as the exponent.

public static double power(double x, double y) {
    double result = 1;
    if (y <= 0)
        return 0;
    for (int count = 0; count < (int)y; count++)
        result *= x;
    return result;
}

Answer 1

You could use Math.log and Math.exp to acheive this.

public static void main(String[] args) throws InterruptedException {


         System.out.println(power(2,2.5));

    }


  public static double power(double x, double y) {

    double val = y *  Math.log(x);

    double result = Math.exp(val);

            return result;
    }

output is

5.65685424949238