How to use PHP to input numbers and calculate the average

In the field of programming, finding the average sum of a certain sequence is a very basic and important algorithm problem. In this article, we will explore the solution to this problem by using PHP language.

First, we need to understand what an average is. Simply put, the average is the sum of a set of numbers divided by the number of numbers in the set. Therefore, we can get the average we require by using a for loop to accumulate all the input numbers and then divide by the number of this group of numbers.

In PHP, we can use the following code to implement this algorithm:

<?php
// 获取输入数列的长度
$n = intval(trim(fgets(STDIN)));

// 初始化变量
$sum = 0;

// 循环累加数列中的数
for ($i = 0; $i < $n; ++$i) {
    $x = intval(trim(fgets(STDIN)));
    $sum += $x;
}

// 计算平均数并输出结果
$avg = $sum / $n;
echo "平均数是: $avg\n";
?>

In this code, we first use the intval() function to read from the standard input Convert the string obtained in to an integer. We then use a for loop to accumulate all input numbers into the variable $sum. Finally, we calculate the average and output the result using the echo statement.

This algorithm looks simple, but it has a very wide range of application scenarios. For example, we can use it to calculate the average score of a group of students, or use it to calculate the average sales volume of a company, etc.

Of course, in practical application, we may encounter some problems. For example, if the input number is large, we may need to use high-precision calculations to avoid floating point precision errors. In addition, we also need to consider input formats and error handling.

To summarize, PHP provides a very simple and practical solution to the problem of finding averages, which we can easily achieve by using for loops and related mathematical formulas. At the same time, we also need to consider the problems that may be encountered in actual applications to ensure that our code can have better applicability and scalability.

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