算法-阶乘求和

最新推荐文章于 2026-01-07 18:44:27 发布

原创最新推荐文章于 2026-01-07 18:44:27 发布 · 124 阅读

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#算法 #java #数据结构

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public class FactorialAndSum {

    public int getFactorialAndSum(int number) throws UnSupportParamException {
        if (number < 1) {
            throw new UnSupportParamException("阶乘求和不允许小于1");
        }
        if (number == 1) {
            return 1;
        }
        // 求和
        int factorialAndSum = 0;
        // 阶乘结果
        int factorial = 1;
        for (int i = 1; i <= number; i++) {
            factorial *= i;
            factorialAndSum += factorial;
        }
        return factorialAndSum;
    }

    public static void main(String[] args) throws UnSupportParamException {
        FactorialAndSum factorialAndSum = new FactorialAndSum();
        System.out.println(factorialAndSum.getFactorialAndSum(10));
        System.out.println(factorialAndSum.getFactorialAndSum(3));
        System.out.println(factorialAndSum.getFactorialAndSum(5));
    }
}
class UnSupportParamException extends Exception {

    public UnSupportParamException(String message) {
        super(message);
    }
}