w3resource
php Programming Exercies

PHP Exercises: Compute sum of the prime numbers less than 100

PHP: Exercise-37 with Solution

Write a PHP program to compute the sum of the prime numbers less than 100.

Note: There are 25 prime numbers are there in less than 100.
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97 and sum of all these numbers is 1060.

Sample Solution: -

PHP Code:

<?php
$primes = array();
$is_prime_no = false;
for ($i = 2; $i<100; $i++) {
     $is_prime_no = true; 
        for ($j = 2; $j<=($i/2); $j++) {
                if ($i%$j==0) {
                          $is_prime_no = false;
                                  break;
                                }
                   }
        if ($is_prime_no) {
               array_push($primes,$i);
                  }
        if (count($primes)==100) {
               break;
                  }
}
echo array_sum($primes)."\n";
?>

Sample Output:

1060       

Flowchart:

Flowchart: Compute sum of the prime numbers less than 100

PHP Code Editor:

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

Previous: Write a PHP program to test if a given string occurs at the end of another given string.
Next: Write a PHP program to valid an email address.

What is the difficulty level of this exercise?



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