PHP Exercises: Print out the sum of pairs of numbers of a given sorted array of positive integers that is equal to a given number

PHP: Exercise-44 with Solution

Write a PHP program to print out the sum of pairs of numbers of a given sorted array of positive integers which is equal to a given number.

Sample Solution:

PHP Code:

<?php
// Define a function to find pairs in an array that sum up to a given value
function find_Pairs($nums, $pair_sum) {
    // Initialize an empty string to store pairs
    $nums_pairs = "";

    // Iterate through each element in the array
    for ($i = 0; $i < count($nums); $i++) {
        // Iterate through subsequent elements to find pairs
        for ($j = $i + 1; $j < count($nums); $j++) {
            // Check if the sum of the current pair equals the target sum
            if ($nums[$i] + $nums[$j] == (int)$pair_sum) {
                // Concatenate the pair to the result string
                $nums_pairs .= $nums[$i] . "," . $nums[$j] . ";";
            }
        }
    }

    // Return the string containing pairs
    return $nums_pairs;
}

// Test the function with example array and pair sums
$nums = array(0, 1, 2, 3, 4, 5, 6);
echo find_Pairs($nums, 7)."\n";
echo find_Pairs($nums, 5)."\n";

?>

Explanation:

• Function Definition:
• The function find_Pairs($nums, $pair_sum) is designed to find pairs of numbers in the array $nums that sum up to the specified value $pair_sum.
• Initialize Result Variable:
• A string variable $nums_pairs is initialized to store the pairs of numbers that meet the criteria.
• Outer Loop:
• A for loop iterates through each element in the array $nums using the index variable $i.
• Inner Loop:
• A nested for loop iterates through the subsequent elements of the array starting from the index $i + 1, using the index variable $j.
• Check for Pair Sum:
• Inside the inner loop, an if statement checks if the sum of the elements at indices $i and $j equals the target sum (int)$pair_sum.
• If they do, the pair (in the format "num1,num2;") is concatenated to the $nums_pairs string.
• Return Pairs:
• After checking all possible pairs, the function returns the string containing the pairs that add up to the target sum.

Output:

1,6;2,5;3,4;                                                
0,5;1,4;2,3; 

Flowchart:

PHP Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a PHP program that multiplies corresponding elements of two given lists.
Next: Write a PHP program to compute the sum of the digits of a number.