"Possible lossy conversion from double to int" when trying to do 2 ^ variable

Question

I am receiving the error "Possible lossy conversion from double to int" on the last line (error pointer pointing at the number "2"), when I am not attempting to convert anything from a double to an int. What am I missing?

System.out.println("This is the ancestry calculator. Enter number of generations: ");
Scanner input = new Scanner(System.in);
int generations = input.nextInt();
int ancestors;
ancestors = Math.pow (2, generations);

`ancestors` is an `int`, and `Math.pow` returns a `double` . — Arnaud, Oct 10 '19 at 12:29

score 1 · Answer 1 · answered Oct 10 '19 at 12:31

1

Math.pow() method returns a double value so if you need to assign it to ancestors you need to cast it.

   ancestors =(int) Math.pow (2, generations);

answered Oct 10 '19 at 12:31

Harry Manoharan

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score 1 · Answer 2 · edited Jan 11 '20 at 18:30

1

Use any of the following:

double ancestors = Math.pow (2.0, generations)

or

int ancestors = (int) Math.pow (2, generations)

edited Jan 11 '20 at 18:30

Martijn Pieters

1,048,767
296
4,058
3,343

answered Oct 10 '19 at 12:32

Arvind Kumar Avinash

71,965
6
74
110

"Possible lossy conversion from double to int" when trying to do 2 ^ variable

2 Answers2