Read double from Scanner and print output without altering

Question

I want to read a double input (say, from Scanner) and print it as is on the console. My double input can vary in precision and scale.

public class SampleTests {

    public static void main(String[] args) {
        double d = 235345345345.234534;
        System.out.printf("%f",d);
    }
}

Output:

235345345345.234530

Expected:

235345345345.234534

Your expectations are not reasonable. The double type has finite precision *and* 235345345345.234534 cannot be exactly represented. Have a look at the old-but-still-good [Is floating point math broken?](https://stackoverflow.com/q/588004/238704) — President James K. Polk, Mar 03 '19 at 19:57

score -1 · Answer 1 · answered Mar 03 '19 at 18:46

-1

If you don't know the exact scale and precision. Use %.nf where 'n' is a number that you expect the precision wouldn't be greater than.

answered Mar 03 '19 at 18:46

Pablo Castro

134
6

1

I tried this - System.out.printf("%.6f",d); Output is still - 235345345345.234530 (which is incorrect) – Aravind Datta Mar 03 '19 at 18:56

Read double from Scanner and print output without altering

1 Answers1