PHP program to find the sum of odd numbers within a given range

To find the sum of odd numbers within a given range, the code is as follows −

Example

 Live Demo

<?php
function odd_num_sum($val)
{
   $entries = (int)($val + 1) / 2;
   $sum = $entries * $entries;
   return $sum;
}
function num_in_range($low, $high)
{
   return odd_num_sum($high) - odd_num_sum($low - 1);
}
$low = 3;
$high = 23;
echo "The sum of odd natural numbers between the numbers 3 and 23 is ", num_in_range($low, $high);
?>

Output

The sum of odd natural numbers between the numbers 3 and 23 is 141.75

A function named ‘odd_num_sum’ is defined that computes the sum of odd numbers within a specific range of numbers. The function ‘num_in_range’ gives the range of values between two numbers that are passed as parameters to this function. Outside both the function, the range values are defined and this function ‘num_in_range’ is called by passing the low and high values as parameters. Relevant output is displayed on the console.