Java cast confusing

Asked Jun 27 '15 at 16:33

Active Jun 27 '15 at 16:33

Viewed 46 times

everyone! this problem is about Java cast behavior. Here is the code:

public static int dotProduct(double[] v1, double[] v2){
    //here the type of res is int
    int res = 0;
    for(int i=0; i<this.dimension; i++){
        res += v1[i] * v2[i];   // no errors
        res = res + v1[i] * v2[i];  // show cast errors
    }
    return res;
}

can someone explains why this code does not throw cast error when use "+=" in eclipse. thanks.

asked Jun 27 '15 at 16:33

Zilong Wen

There **must** be a duplicate to this question already on this site. – Hovercraft Full Of Eels Jun 27 '15 at 16:35
http://stackoverflow.com/questions/13297207/is-it-valid-to-compare-a-double-with-an-int-in-java Asks essentially the same question. The accepted answer has the correct information. – SwiftySwift Jun 27 '15 at 17:08

Java cast confusing

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