# how can i do ?

Discussion in 'C Programming' started by wahid, Jan 10, 2010.

1. ### wahidGuest

• Write a program that will take an integer
number n input from the user, and then
output the value of the sum of the series
• S = 12 + 22 + 32+….. + n2

wahid, Jan 10, 2010

2. ### Ian CollinsGuest

wahid wrote:
> • Write a program that will take an integer
> number n input from the user, and then
> output the value of the sum of the series
> • S = 12 + 22 + 32+….. + n2

Solve the problem on paper, then convert it to code, then post your
attempt if you have problems.

Asking people to do your homework is a great way to learn absolutely

--
Ian Collins

Ian Collins, Jan 10, 2010

3. ### wahidGuest

On Jan 10, 1:05 pm, wahid <> wrote:
> • Write a program that will take an integer
> number n input from the user, and then
> output the value of the sum of the series
> • S = 1^2 + 2^2 + 3^2+….. + n^2

wahid, Jan 10, 2010
4. ### SeebsGuest

On 2010-01-10, wahid <> wrote:
> ? Write a program that will take an integer
> number n input from the user, and then
> output the value of the sum of the series
> ? S = 12 + 22 + 32+?.. + n2

You never post thank-you notes to the people who do your homework, why is
that?

-s
--
Copyright 2010, all wrongs reversed. Peter Seebach /
http://www.seebs.net/log/ <-- lawsuits, religion, and funny pictures
http://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated!

Seebs, Jan 10, 2010
5. ### Keith ThompsonGuest

wahid <> writes:
> Â• Write a program that will take an integer
> number n input from the user, and then
> output the value of the sum of the series
> Â• S = 12 + 22 + 32+Â….. + n2

Go away and do your own damned homework.

--
Keith Thompson (The_Other_Keith) <http://www.ghoti.net/~kst>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

Keith Thompson, Jan 10, 2010
6. ### NickGuest

Seebs <> writes:

> On 2010-01-10, wahid <> wrote:
>> ? Write a program that will take an integer
>> number n input from the user, and then
>> output the value of the sum of the series
>> ? S = 12 + 22 + 32+?.. + n2

>
> You never post thank-you notes to the people who do your homework, why is
> that?

He did to the last one (the print the three digits). There were some
beautiful answers there, I wonder which one he used.
--
Online waterways route planner | http://canalplan.eu
Plan trips, see photos, check facilities | http://canalplan.org.uk

Nick, Jan 10, 2010
7. ### Ike NaarGuest

In article <>,
wahid <> wrote:
>On Jan 10, 1:05 pm, wahid <> wrote:
>> • Write a program that will take an integer
>> number n input from the user, and then
>> output the value of the sum of the series
>> • S = 1^2 + 2^2 + 3^2+….. + n^2

>

#include<stdio.h>/**/
int main(void){int n;
scanf("%d",&n);printf
("%d\n",(((n<<1)+(1<<
1)+1)*n+1)*n/(((1<<1)
+1)<<1));return 1-1;}

Ike Naar, Jan 10, 2010
8. ### Antoninus TwinkGuest

On 10 Jan 2010 at 7:05, wahid wrote:
> â€¢ Write a program that will take an integer
> number n input from the user, and then
> output the value of the sum of the series
> â€¢ S = 12 + 22 + 32+â€¦.. + n2

#include <stdio.h>
#include <limits.h>

int main(void)
{
int d, rv = 0;
fputs("Enter a Number: ", stdout);
fflush(stdout);
if(scanf("%d", &d) == 1 && d > 0) {
if((7. + 5 * d) * d > ULLONG_MAX) {
fputs("Integer overflow\n", stderr);
rv = 1;
} else
printf("12 + 22 + ... + %d2 = %llu\n", d, (7ULL + 5 * d) * d);
}
else {
fputs("Invalid input: needed a positive integer\n", stderr);
rv = 1;
}
return rv;
}

Antoninus Twink, Jan 10, 2010
9. ### Eric SosmanGuest

On 1/10/2010 2:05 AM, wahid wrote:
> • Write a program that will take an integer
> number n input from the user, and then
> output the value of the sum of the series
> • S = 12 + 22 + 32+….. + n2

Sounds like a bad idea. If the program takes an integer
from the user each time it is run, how can the user get the
integer back again? Think of how inconvenient it would be if
you gave away 3, say, and could never use it again: You could
never again sing "Three Blind Mice" or listen to the Threepenny
Opera or celebrate Epiphany, or ride in a train powered by an
electrified third rail. The Holy Trinity would reject you, and
the entire month of March would be lost to you forever!

You could, I guess, select an "unlikely" integer as the
one to give away, but it seems awfully hard to choose one that
you're certain you'll never need again. The very fact that
you chose it once indicates that it is far more likely to crop
up than almost all other integers. Also, if you give the
integer to an early version of the program, discover that the
program has a bug, and fix it, how will you test the fix? You
no longer have the integer that caused the misbehavior, and
can thus not be sure you've actually fixed the problem.

Wahid, I think you should go to your teacher and point out
these serious drawbacks. Tell him or her that the assignment
threatens those who complete it with a sort of progressive
innumeracy by depriving them of another integer each time they
run the code. Tell him or her, in short, that he or she is
either a sadist or a fool, and ask for a substitute assignment.
student.

--
Eric Sosman
lid

Eric Sosman, Jan 10, 2010
10. ### Kenny McCormackGuest

In article <>,
Keith Thompson <> wrote:
>wahid <> writes:
>> Â• Write a program that will take an integer
>> number n input from the user, and then
>> output the value of the sum of the series
>> Â• S = 12 + 22 + 32+Â….. + n2

>
>Go away and do your own damned homework.

Temper, temper, my good man!

Where the Kiki we all know and love, who is so eager to "help" people?

That is your reason for being here, isn't it?
(As you've said in the past, when I've asked you directly why you are here)

Kenny McCormack, Jan 10, 2010