常见数学应用计算的java实现

1、判断是否素数

    public static boolean isPrime(int num) {
        if (num <= 3) return num > 1;
        if (num % 6 != 1 && num % 6 != 5) return false;
        for (int i = 5; i <= Math.sqrt(num); i += 6) {
            if (num % i == 0 || num % (i + 2) == 0) {
                return false;
            }
        }
        return true;
    }

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转载自blog.csdn.net/xingyuemengjin/article/details/141971766