PHP Exercises: Compute the sum of three given integers. If the two values are same return the third value

Last update on May 28 2025 13:07:40 (UTC/GMT +8 hours)

54. Sum of Three with Duplicate Override

Write a PHP program to compute the sum of three given integers. If the two values are same return the third value.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that takes three parameters and returns a value based on certain conditions
function test($x, $y, $z)
{
    // Check if all three parameters are equal; if true, return 0
    if ($x == $y && $y == $z) return 0;
    
    // Check if $x is equal to $y; if true, return $z
    if ($x == $y) return $z;
    
    // Check if $x is equal to $z; if true, return $y
    if ($x == $z) return $y;
    
    // Check if $y is equal to $z; if true, return $x
    if ($y == $z) return $x;
    
    // If none of the above conditions are met, return the sum of $x, $y, and $z
    return $x + $y + $z;
}

// Test the 'test' function with different input values and display the results
echo (test(4, 5, 7))."\n";
echo (test(7, 4, 12))."\n";
echo (test(10, 10, 12))."\n";
echo (test(12, 12, 18))."\n";
?>

Explanation:

Function Definition:

The test function takes three parameters: $x, $y, and $z. Based on various conditions, it returns a specific value.

Conditions:

All Equal: If all three parameters ($x, $y, and $z) are equal, the function returns 0.
Two Equal (Returning Third):

If $x and $y are equal, it returns $z.
If $x and $z are equal, it returns $y.
If $y and $z are equal, it returns $x.

None of the Above: If none of the values are equal, it returns the sum of $x, $y, and $z.

Output:

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to compute the sum of three integers but if any two are equal, return the remaining third number.
Write a PHP function to sum three numbers and check for equality among any two, outputting only the unique value if duplicates occur.
Write a PHP program to add three integers and conditionally exclude the duplicate values from contributing to the sum.
Write a PHP script to design logic that compares three integers and if a pair is found identical, returns the value of the odd one out.

Go to:

PREV : Sum with Digit-Length Constraint.
NEXT : Sum Excluding 13 and Right Side.

PHP Code Editor:

Contribute your code and comments through Disqus.