PHP Exercises: Check if a given number is within 2 of a multiple of 10

Last update on May 28 2025 13:05:15 (UTC/GMT +8 hours)

43. Within 2 of a Multiple of 10

Write a PHP program to check if a given number is within 2 of a multiple of 10.

Sample Solution:

PHP Code :

<?php
// Define a function that checks if the last digit of a number is less than or equal to 2 OR greater than or equal to 8
function test($n)
{
    // Check if the remainder of $n divided by 10 is less than or equal to 2 OR greater than or equal to 8
    return $n % 10 <= 2 || $n % 10 >= 8;
}

// Test the function with different values
var_dump(test(3));
var_dump(test(7));
var_dump(test(8));
var_dump(test(21));
?>

Explanation:

Function Definition:

The test function checks if the last digit of a given number $n is within a specific range.

Condition Checked:

The function evaluates whether the last digit of $n:

Is less than or equal to 2 (i.e., $n % 10 <= 2), OR
Is greater than or equal to 8 (i.e., $n % 10 >= 8).

This is done by checking the remainder when $n is divided by 10, which gives the last digit of $n.

Output:

bool(false)
bool(false)
bool(true)
bool(true)

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to test if a given number is within 2 of any multiple of 10 using modulo operations and absolute difference comparisons.
Write a PHP function to iterate through possible multiples of 10 and determine if the input falls within a tolerance of ±2.
Write a PHP program to check proximity to the nearest multiple of 10 by computing the difference and comparing it with 2.
Write a PHP script to simulate the condition by rounding to the nearest ten and verifying if the absolute difference is less than or equal to 2.

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