PHP Exercises: Check three given integers and return true if the difference between small and medium and the difference between medium and large is same

PHP Basic Algorithm: Exercise-58 with Solution

Write a PHP program to check three given integers (small, medium and large) and return true if the difference between small and medium and the difference between medium and large is same.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that takes three parameters and returns a boolean value based on conditions
function test($x, $y, $z)
{
    // Check if the sequence of numbers is in ascending order and the differences are equal
    if ($x > $y && $x > $z && $y > $z) return $x - $y == $y - $z;
    
    // Check if the sequence of numbers is in ascending order and the differences are equal
    if ($x > $y && $x > $z && $z > $y) return $x - $z == $z - $y;
    
    // Check if the sequence of numbers is in ascending order and the differences are equal
    if ($y > $x && $y > $z && $x > $z) return $y - $x == $x - $z;
    
    // Check if the sequence of numbers is in ascending order and the differences are equal
    if ($y > $x && $y > $z && $z > $x) return $y - $z == $z - $x;
    
    // Check if the sequence of numbers is in ascending order and the differences are equal
    if ($z > $x && $z > $y && $x > $y) return $z - $x == $x - $y;
    
    // If none of the above conditions are met, check if the sequence of numbers is in ascending order and the differences are equal
    return $z - $y == $y - $x;
}

// Test the 'test' function with different input values and display the results
var_dump(test(4, 5, 6));
var_dump(test(7, 12, 13));
var_dump(test(-1, 0, 1));
?>

Explanation:

• Function Purpose:
• The test function takes three numbers as parameters ($x, $y, $z) and checks if they form an ordered sequence (in ascending or descending order) where the difference between consecutive numbers is the same.
• Conditions:
• The function checks different possible sequences and returns true if the difference between consecutive numbers is equal:
• Condition 1: $x > $y > $z, and the difference between $x - $y equals $y - $z.
• Condition 2: $x > $z > $y, and the difference between $x - $z equals $z - $y.
• Condition 3: $y > $x > $z, and the difference between $y - $x equals $x - $z.
• Condition 4: $y > $z > $x, and the difference between $y - $z equals $z - $x.
• Condition 5: $z > $x > $y, and the difference between $z - $x equals $x - $y.
• Condition 6: If none of the above match, it checks if $z > $y > $x with the difference between $z - $y equaling $y - $x.

Output:

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

Flowchart:

PHP Code Editor:

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