Tính tổng S = 1! + 2! + … + n!
Bài này chúng ta sẽ cùng giải quyết vấn đề sau: “Nhập số nguyên dương n và tính tổng: S = 1 + 1.2 + 1.2.3 + … + 1.2.3…n“. Nếu tinh ý bạn sẽ thấy đây là cấu trúc của một tổng cấp số giai thừa: S = 1! + 2! + 3! + … +n!. Vậy ta đơn giản là thực hiện việc tính i! rồi cộng vào kết quả thôi.
Các bước thực hiện chương trình của ta như sau:
- Khởi tạo tổng kiểu unsigned long long sum = 0; khởi tạo biến unsigned long long factorial = 1;
- Dùng vòng for cho biến i chạy từ 1 đến n, tính factorial = factorial * i; sum += factorial. Tức là tính i! và cộng kết quả vào tổng cuối.
- In ra kết quả. Xong.
Sau đây là chương trình C hoàn chỉnh giải quyết vấn đề này:
Như vậy là ta đã hoàn thành bài tính tổng giai thừa này rồi. Mọi băn khoăn thắc mắc cũng như đóng góp ý kiến bạn để lại phần comment nhé!
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