w3resource
php Programming Exercies

PHP Exercises: Reads an integer n and find the number of combinations

PHP: Exercise-51 with Solution

Write a PHP program which reads an integer n and find the number of combinations of a,b,c and d (0 ≤ a,b,c,d ≤ 9) where (a + b + c + d) will be equal to n.

Input:
n (1 ≤ n ≤ 50) .

Sample Solution: -

PHP Code:

<?php
 while (($input = trim(fgets(STDIN))) !== '') {
    $input = intval($input);
    $count = 0;
    for ($i=0; $i < 10; $i++) { 
        for ($j=0; $j < 10; $j++) { 
            for ($k=0; $k < 10; $k++) { 
                for ($l=0; $l < 10; $l++) { 
                    if ($i + $j + $k +$l === $input) {
                        $count++;
                    }
                }
            }
        }
    }
    echo "\nNumber of combinations of a,b,c and d: ";
    echo $count."\n";
}
?>

Sample Output:

Number of combinations of a,b,c and d: 56

Flowchart:

Flowchart: Reads an integer n and find the number of combinations

PHP Code Editor:

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

Previous: Write a PHP program to compute the amount of the debt in n months.
Next: Write a PHP program to print the number of prime numbers which are less than or equal to a given integer.

What is the difficulty level of this exercise?



New Content: Composer: Dependency manager for PHP, R Programming