Getting Math.pow to return a correct value?

how can I make this expression not end up being a zero.

        double dBaseFitness = (double) baseFitness;
        x.shortfitness = (long)(Math.pow(dbaseFitness, dbaseFitness/8开发者_开发技巧.0)/100.0)
                *(long)(Math.pow((double)x.genome.GSIZE, -.1)/100.0);

x.shortfitness is a long value. x.Genome.GSIZE is an int.

The only reason I am dividing each expression by 100 is so that the result doesn't exceed the max value of the long type.

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Is baseFitness an integer? If so then baseFitness/8 does integer division. For example 7/8 will yield 0. Change your 8 and 100 to 8d and 100d to force floating point division.

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If both the operands of an arithmetic expression are integral types, then the result will be too. So, for example, if "baseFitness" is an integer less than 8, then baseFitness/8 will be zero. Use "8.0" and "100.0" instead.