division


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  1. #1
    Join Date
    May 2005
    Posts
    4

    division

    I'm using this:
    Code:
    NumberFormat formatter = new DecimalFormat("##.##");
    double nota=(punctaj / nr_intrebari)*10;
    String notafinala=formatter.format(nota);
    where punctaj and nr_intrebari are int

    Why nota or notafinala is 0 (zero) is the result of the division is not an integer?
    For example, if punctaj=1 and nr_intrebari=3 then nota=0.0.Why? I want the result to be a double like 0,33.

  2. #2
    Join Date
    Jul 2005
    Posts
    78
    Your trouble is with this line:
    Code:
    double nota=(punctaj / nr_intrebari)*10;
    Because punctaj and nr_intrebari are int's, then 1/3 = 0 -> you're doing integer division. Integer division discards the remainder. 1/3 = 0.333... so the integer answer is 0. 6/5 = 1.2 so the integer answer is 1.

    If you want the result as a double, you have to cast.

    Try this:
    Code:
    double nota=(punctaj / (double)nr_intrebari)*10;
    The (double) tells the compiler that you want to evaluate the integer division as if it were floating point division.
    Last edited by masher; 05-31-2006 at 08:08 PM.

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