public class MixedTypeOp
{
    public static void main(String[] args)
    {
        short  a = 1;
        int    b = 2;
        float  c = 3;
        double d = 4;

        int    x;
        double y;

        x = a + b; // Allowed
        y = a + c; // Disallowed (a + c has data type FLOAT)
    }
}