可能会失去精确度

Question

I am trying to run this code in java and getting following error, required int found double.

public class UseMath{
public static void main(String[]args){
  int x = Math.pow (2,4);
System.out.println ("2 to the power of 4 is" + x);

 }
}

Answer 1

If you take a look at the documentation , it says, that Math.pow() expects two doubles , and returns a double . When you pass ints to this function, it means no harm, because casting (converting) an int to double means no loss. But when you assign the value to an int , it means, it can lose precision.

Simply do this:

int x = (int)Math.pow (2,4);

or

double x = Math.pow (2,4);