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
// Continue reading input until an empty line is encountered
while (($input = trim(fgets(STDIN))) !== '') {
// Convert the input string to an integer
$input = intval($input);
// Initialize a counter for the number of combinations
$count = 0;
// Nested loops to iterate over all possible combinations of a, b, c, and d
for ($i = 0; $i < 10; $i++) {
for ($j = 0; $j < 10; $j++) {
for ($k = 0; $k < 10; $k++) {
for ($l = 0; $l < 10; $l++) {
// Check if the sum of a, b, c, and d equals the input
if ($i + $j + $k + $l === $input) {
// Increment the counter for each valid combination
$count++;
}
}
}
}
}
// Print the number of combinations for the given input
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:
PHP Code Editor:
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