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PHP - Vòng lặp for tìm phần tử lớn nhất trong mảng
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PHP - Vòng lặp for tìm phần tử lớn nhất trong mảng
Cho mảng gồm các phần tử sau:
$array = [
1, 23, 32, 5,43, 321, 312, 352, 2, 13 ,153, 21,32 ,1
];
Hãy viết chương trình PHP tìm số lớn nhất trong mảng đó, và in ra vị trí nó đang đứng trong mảng.
Bài giải
-------------------- ######## --------------------
Để tìm số lớn nhất thì bước đầu tiên ta sẽ tạo một biến $max
lưu phần tử đầu tiên $array[0]
lại và xem như nó là phần tử lớn nhất, sau đó duyệt qua từng phần tử tiếp theo rồi so sánh, nếu phần tử nào lớn hơn $max thì lập tức gán giá trị của phần tử đó cho $max.
Bài viết này được đăng tại freetuts.net , không được copy dưới mọi hình thức.
Theo yêu cầu của đề bài ta phải in ra vị trí phần tử lớn nhất, vì vậy ta sẽ tạo một biến tên là $vitri, và cách gán giá trị cho nó thì cũng tương tự như gán cho $max.
Để đếm tổng số phần tử thì ta dùng hàm count .
Bài viết này được đăng tại [free tuts .net]
Bài giải
$array = [
1, 23, 32, 5,43, 321, 312, 352, 2, 13 ,153, 21,32 ,1
];
$max = null;
$position = null;
for ($i = 0; $i < count($array); $i++)
{
if ($max == null){
$max = $array[$i];
$position = $i;
}
else {
if ($array[$i] > $max){
$max = $array[$i];
$position = $i;
}
}
}
echo "Giá trị lớn nhất là $max, nằm tại vị trí $position";
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