phpifelse语句判断3个数大小并由小到大输出

Introduction

When it comes to programming, decision-making is a crucial part. We often need to make decisions based on certain conditions or criteria. PHP provides various conditional statements such as if-else, switch, etc. One of the most commonly used conditional statements is the if-else statement. In this article, we will look at how to use the if-else statement to determine the size of three numbers and print them in ascending order.

Understanding the Problem Statement

Before we dive into coding, let us first understand the problem statement. We have three numbers, and we need to determine which number is the smallest, which one is the largest, and the third number falls in between them. Once we figure out the order of these numbers, we need to print them in ascending order.

Coding the Solution

Let us now code the solution. We will use if-else statements to identify the smallest, largest, and middle numbers among the given three numbers. We will then print these numbers in ascending order. Let's take a look at the code snippet below:

```
php$num1 = 10;$num2 = 20;$num3 = 30;if($num1 <= $num2 && $num1 <= $num3) { if($num2 <= $num3) { echo $num1 . " " . $num2 . " " . $num3; } else { echo $num1 . " " . $num3 . " " . $num2; }}elseif($num2 <= $num1 && $num2 <= $num3) { if($num1 <= $num3) { echo $num2 . " " . $num1 . " " . $num3; } else { echo $num2 . " " . $num3 . " " . $num1; }}else { if($num1 <= $num2) { echo $num3 . " " . $num1 . " " . $num2; } else { echo $num3 . " " . $num2 . " " . $num1; }}?>
```

In the code above, we have initialized three variables with some random values. We then used if-else statements to check which number is the smallest, largest, and middle number. Based on this determination, we printed them in ascending order.

Conclusion

The if-else statement is a powerful tool in PHP programming that helps developers make decisions based on certain conditions. In this article, we learned how to use the if-else statement to determine the size of three numbers and print them in ascending order. By understanding the problem statement and using if-else statements correctly, we can solve a wide range of problems in PHP programming.