Java bug/inconsistency adding float and int values

Asked Dec 08 '21 at 19:28

Active Dec 08 '21 at 19:39

Viewed 80 times

Check this code:

    public static void checkBug() {
        int a = 16763383;
        int b = 16763383;

        float myFloat = 222778.0f;
        int myInt = 222778;

        a += myInt;
        b += myFloat;
        System.out.println("A is : " + a + " and B is: " + b);
    }

The result is A is : 16986161 and B is: 16986160

Why this discrepancy? I have been testing with many values of a, b, myFloat and myInt but I could no find any proper explanation why it happens with these particular values. Also, I can execute/compile b += myFloat; but I cannot do it with b = b + myFloat;.

asked Dec 08 '21 at 19:28

ernirulez

Printing `b+myFloat` (*before* you change `b`) might give you a clue. – Scott Hunter Dec 08 '21 at 19:32
https://cs.stackexchange.com/questions/119225/why-is-there-a-precision-loss-for-floating-point-numbers – ControlAltDel Dec 08 '21 at 19:33
This doesn't necessarily seem surprising, given the imprecision of `float`. – Louis Wasserman Dec 08 '21 at 19:36

Java bug/inconsistency adding float and int values

0 Answers0