Print N decimals of float or double

Question

What is the best way to write something like this:

Scanner input = new Scanner(System.in);
int n = input.nextInt();
double d = 5.123456789123456789;
System.out.printf("%.nf", d);

Thanks!

Answer 1

The format string is just a String that you can create at runtime. E.g.

System.out.printf("%." + n + "f", d);