Miles to Kilometers

Question

What am I doing wrong
import java.util.Scanner;
public class MilesToKm{
public static void main(String[] args){
float miles, conversion;
Scanner scan;
scan = new Scanner (System.in);
System.out.println("Please enter number of miles: ");
miles = scan.nextFloat();
conversion = miles * 1.609;
System.out.println("The number of miles in kilometers is: " + conversion +".");
im getting
MilesToKm.java:13: possible loss of precision
found : double
required: float
conversion = miles * 1.609;
^
1 error
----jGRASP wedge: exit code for process is 1.
----jGRASP: operation complete.

Answer 1

Any floating point literal--e.g. 1.609--is of type double.
Any calculation that contains a double yields a double result.
So it's as if you did this:
double d = 1.234;
float f = d;You can't stuff a double into a float. If you want to do that assignment, you need to cast:
float f = (float)d;  // EDIT: Oops, was double in the cast, should've been float. Thanks warnerja.However, you're better off just using double throughout. There's no reason to use float at all.
Edited by: jverd on Jan 29, 2009 1:20 PM