PHP Exercises: Check a given integer and return true if it is within 10 of 100 or 200

Last update on December 20 2024 10:20:17 (UTC/GMT +8 hours)

Write a PHP program to check a given integer and return true if it is within 10 of 100 or 200.

Sample Solution:

PHP Code :

<?php
// Define a function named "test" that takes a parameter $x
function test($x) 
{
    // Use the absolute value function (abs) to check if the absolute difference between $x and 100 is less than or equal to 10
    // OR if the absolute difference between $x and 200 is less than or equal to 10
    if (abs($x - 100) <= 10 || abs($x - 200) <= 10)
        // If true, return true
        return true;

    // If false, return false
    return false;
}

// Use var_dump to print the result of calling test with argument 103
var_dump(test(103));

// Use var_dump to print the result of calling test with argument 90
var_dump(test(90));

// Use var_dump to print the result of calling test with argument 89
var_dump(test(89));
?>

Explanation:

Function Definition:

The function test is defined with a single parameter $x.

Condition Check:

The function checks if:

The absolute difference between $x and 100 is less than or equal to 10, or
The absolute difference between $x and 200 is less than or equal to 10.

It uses the abs function to calculate the absolute difference, ensuring it works correctly with both positive and negative values.
If either condition is met, the function returns true; otherwise, it returns false.

Function Calls and Output:

First Call: var_dump(test(103));

abs(103 - 100) is 3, which is within 10, so it returns true.

Second Call: var_dump(test(90));

abs(90 - 100) is 10, which is within 10, so it returns true.

Third Call: var_dump(test(89));

abs(89 - 100) is 11, which is more than 10, so it returns false.

Output:

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

Flowchart:

PHP Code Editor:

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