*
... calculate the sum of 1^2 + 2^2 + 3^2 + …. + n^2,(these are exponents) ... *

` $sum = 1**2+2**2+3**2+4**2+5**2+6**2+7**+$n**2;`

... my calculation is wrong the results is not what it should be, **why?**

You've left out the …. part of the summation specification from the

` $sum = 1**2+2**2+3**2+4**2+5**2+6**2+7**+$n**2;`

statement (**update:** which is in error in any event: what is the ` 7**+$n**2 ` term supposed to represent?). If n were 15, where are 8, 9, 10, 11, 12, 13, 14 in the sequence of numbers to be squared and summed?

`c:\@Work\Perl\monks>perl -wMstrict -le
"use Data::Dump qw(dd);
use List::Util qw(sum reduce);
;;
my $n = 15;
dd 1 .. $n;
dd map $_**2, 1 .. $n;
dd sum map $_**2, 1 .. $n;
;;
use vars qw($a $b);
dd reduce { $a + $b**2 } 1 .. $n;
"
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
(1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225)
1240
1240
`

I haven't tested it, but

NetWallah's

solution looks right.

**Update:** See Range Operators in perlop for the ` .. ` operator in list context.

**Update 2:** I actually missed the whole

` for ('$i=0; <= $n; $i++')
{
$sum += $i;
}
`

piece of the OPed code, but that's ok because without strictures and warnings enabled, it's just a no-op in the final execution. :)

**Update 3:** Changed example code to use ranges of ` 1 .. $n ` with ` $n ` initialized to 15 instead of literal ` 1 .. 15 ` ranges; makes the point a little better. Also added the `reduce` example.

Give a man a fish**:** ` <%-{-{-{-<`

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