PHP Algorithm Exercise 5: Determine whether a number is a multiple of a specified number

Hello~ This article continues to introduce you to the series of articles on PHP basic algorithms. Then in the previous article "PHP Algorithm Exercise 4: Multiply the corresponding elements of two given lists" It introduces how to multiply the corresponding elements of two given lists. Friends who are interested can learn about it~

Now let’s get into the theme of this article~

It’s an old rule. Suppose there is a question like "How to write a PHP program to check whether a given positive number is a multiple of 3 or 7"?

Of course, 3 and 7 here can be replaced at will. This is just an example question~

I wonder if you have any ideas for implementing this problem?

The following is my implementation method:

PHP code such as:

<?php

function test($n)
{
    return $n % 3 == 0 || $n % 7 == 0;
}

var_dump(test(3));
var_dump(test(14));
var_dump(test(12));
var_dump(test(37));

We run the file directly and the output judgment result is:

It can be seen that in the above example, the judgment data we gave are 3, 14, 12, 37, and the judgment results are true, true, true, and false respectively.

Obviously, 3, 14, and 12 are multiples of 3 or 7, but 37 is neither a multiple of 3 nor 7, so the judgment result is correct.

Here we mainly need to master the arithmetic operators % and comparison operators == and logical operators ||# in PHP

##% (modulo): x % y,, represents the remainder of x divided by y;

== (equal): x == y, represents if x is equal to y, returns true;

|| (or): x || y, which means if at least one of x and y is true, then true is returned.

Attachment: The concept of multiples

①An integer can be evenly divided by another integer, and this integer is a multiple of the other integer. For example, 15 is divisible by 3 or 5, so 15 is a multiple of 3 and a multiple of 5.

②The quotient obtained by dividing one number by another number. For example, a÷b=c, that is to say, a is a multiple of b. For example: A÷B=C, it can be said that A is C times of B.

③There are countless multiples of a number, which means that the set of multiples of a number is an infinite set. Note: You cannot call a number a multiple alone, you can only say who is a multiple of whom.

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