View Full Version : Help with a simple mathematics script

tokio

05-08-2009, 10:17 PM

I want to find the summation of the integers from 1-100. So i want to find 1+2+3+4+5+...n. The first thing i thought about issuing a for loop to print the number of terms, and i was then thinking of a function to sum up all of the terms.

for ($i=1; $i<100;$i++) {

print $i; // prints terms 1-100

}

Any recommendations to find the summation of the terms? Thanks.

Tokio

for ($i=1; $i<100;$i++) {

$sum = $i;

}

echo $sum;

I think that should do it.

Len Whistler

05-08-2009, 10:47 PM

This will output the results line by line. An echo outside the loop would be the final total.

<?php

$array = range(1,100);

foreach ($array as $value) {

$sum = $sum + $value;

echo "$sum<br>";

}

?>

---------

XtremeGamer99

09-29-2009, 08:17 AM

Alternatively, you can use the arithmetic sequence equation:

(n/2)*(2a+(n-1)), where n = max number, a = min number.

<?php

$a = 1;

$n = 100;

$sum = ($n/2)*(2*($a)+($n-1));

echo sum; // echos '5050'

?>

EDIT: woah, didn't realize this topic was old. Was using the search function. <_<

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