Question

I got:

int number = 1255; -> //It could also be 125(1€25Cent) or 10(10Cent) or 5(5Cent)

public double toMoney(int number)
{
...
}

as return, I want the double number: 12.55 or if input: 10 then: 00.10

I know that I can do with Modulo something like this:

1255 % 100.. to get 55.. But how to do it for 12 and at the end, how to
form it as a double?

Answer 1

If I’m understanding your question correctly, you’re probably trying to just do this:

return (double)number / 100.;

Though a word of warning: You shouldn’t be using floating-point for money due to round-off issues.

If you just want to print the number in money format, here’s a 100% safe method:

System.out.print((number / 100) + ".");
int cents = number % 100;
if (cents < 10)
    System.out.print("0");
System.out.println(cents);

This can probably be simplified a lot better… Of course you can go with BigDecimal, but IMO that’s smashing an ant with a sledgehammer.