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PHP - Vòng lặp for tính tổng S = 1 + 1/2 + 1/3 + 1/4 +… 1/n
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PHP - Vòng lặp for tính tổng S(n) = 1 + 1/2 + 1/3 + 1/4 +… 1/n
Giả sử cho trước số tự nhiên n, hãy tính tổng S theo công thức sau:
S = 1 + 1/2 + 1/3 + 1/4 +… 1/n
Bài giải
-------------------- ######## --------------------
Theo như công thức thì ta thấy sẽ phải sủ dụng vòng lặp for lặp từ 1 tới n, sau đó tại mỗi lần lặp sẽ cộng dồn kết quả của 1/i
vào tổng S (với i là số thứ tự lặp ). Bài giải như sau:
Bài viết này được đăng tại freetuts.net , không được copy dưới mọi hình thức.
// Giả sử n = 100
$n = 100;
// Khai báo biến tổng và gán giá trị ban đầu = 0
$tong = 0;
// Bắt đầu lặp và cộng dồn vào biến tổng
for ($i = 1; $i <= $n; $i++){
$tong += 1/$i;
}
// In kết quả
echo "Tổng là: " . $tong;
echo '<br/> Freetuts.net chúc bạn học tốt';
Vì PHP không có chương trình console nên mình gán mặc định cho n = 100. Và dưới đây là kết quả.
Câu hỏi thường gặp liên quan:
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