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Tính tổng cấp số cộng

Trong nội dung này ta sẽ viết chương trình giải quyết vấn đề: “Nhập số tự nhiên n rồi tính tổng: S = 1 + 2 + … + n“. 

Để giải quyết vấn đề này có nhiều cách khác nhau: sử dụng vòng lặp, sử dụng công thức toán học. Trong cả hai cách chúng ta đều nhận được kết quả như nhau. Thuật toán và các bước thực hiện cụ thể như sau:

Với cách sử dụng vòng lặp

  1. Khởi tạo biến tổng sum = 0, biến chạy i = 1
  2. Dùng vòng lặp for cho i chạy từ 1 đến n, cộng giá trị i vào tổng: sum += i
  3. hiện kết quả sum

Với cách sử dụng công thức toán

  • Công thức tính cấp số cộng của bài này là: s = n(n+1)/2.
  • in ra kết quả

Sau đây là chương trình thực hiện trên ngôn ngữ lập trình C:

Như vậy chúng ta đã giải quyết xong vấn đề này rồi. Nếu có ý kiến đóng góp hay câu hỏi nào bạn hãy để lại phía dưới phần commnet nhé.

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