A question about how to enter a very long number.

[66650755]

I would like to enter a string such as "111111111111.. ...11111111" (50
ones),and then convert it to a
number(11111111 1111.....111111 11),because I want to use that number to
do some additions.How can I do that?

The following is my trial,but I find that the "a" is always 0.

#include<stdio. h>
#include<stdlib .h>

int main()
{

char string1[50];
int a;

scanf("%s",stri ng1);

a= atoi("string1") ;

printf("%d",a);

return 0;
}

[Ben Bacarisse]

Martin Ambuhl <ma*****@earthl ink.netwrites:

Ben Bacarisse wrote:

>66******@qq.com writes:

>>I would like to enter a string such as "111111111111.. ...11111111" (50
ones),and then convert it to a
number(111111 111111.....1111 1111),because I want to use that number to
do some additions.How can I do that?

I would not try. Your system is unlikely to have any integer type
that can hold the value so you have to do something else.

This is an ubwarranted claim. The number of implementations without a
64 bit integral type is becoming vanishingly small.
And 66650755 needs only 50 of them.

True, but I thought the 1s were an example and the number was
decimal. This seemed reasonable since the code tried to use atoi.
You've given the OP the base-2 solution so all the bases are now
covered!

--
Ben.

[WANG Cong]

66******@qq.com wrote:

I would like to enter a string such as "111111111111.. ...11111111" (50
ones),and then convert it to a
number(11111111 1111.....111111 11),because I want to use that number to
do some additions.How can I do that?

Well, if that is a binary number, you can use strtoll(); if that is a
decimal, _probably_ you have to need the gmp library to make that.

See: http://gmplib.org/

Good luck!
Cong

[CBFalconer]

Mark McIntyre wrote:

>

.... snip ...

>
What is the largest number you can hold in an int?

INT_MAX, as read from <limits.h>.

--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.

[Keith Thompson]

CBFalconer <cb********@yah oo.comwrites:

Mark McIntyre wrote:

>>

... snip ...

>>
What is the largest number you can hold in an int?

INT_MAX, as read from <limits.h>.

By snipping most of Mark's message, you give the impression that he's
not already perfectly well aware of that. His intent, I think was to
encourage the OP to think about these questions, not to solicit
answers to be posted here.

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <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"

[Richard Tobin]

In article <49************ ***@yahoo.com>,
CBFalconer <cb********@mai neline.netwrote :

>What is the largest number you can hold in an int?

>INT_MAX, as read from <limits.h>.

Your habit of responding to posts without any regard for context
is making you look like a poor AI program.

-- Richard
--
Please remember to mention me / in tapes you leave behind.

[CBFalconer]

Keith Thompson wrote:

CBFalconer <cb********@yah oo.comwrites:

>Mark McIntyre wrote:

>>>

... snip ...

>>>
What is the largest number you can hold in an int?

INT_MAX, as read from <limits.h>.

By snipping most of Mark's message, you give the impression that
he's not already perfectly well aware of that. His intent, I
think was to encourage the OP to think about these questions, not
to solicit answers to be posted here.

Not so. By snipping I reduced the question/answer to a minimum
that could impress a relatively newbie reader. Usenet is not a
home for private messages. Everything is public.

--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.

[Keith Thompson]

CBFalconer <cb********@yah oo.comwrites:

Keith Thompson wrote:

>CBFalconer <cb********@yah oo.comwrites:

>>Mark McIntyre wrote:

... snip ...

What is the largest number you can hold in an int?

INT_MAX, as read from <limits.h>.

By snipping most of Mark's message, you give the impression that
he's not already perfectly well aware of that. His intent, I
think was to encourage the OP to think about these questions, not
to solicit answers to be posted here.

Not so. By snipping I reduced the question/answer to a minimum
that could impress a relatively newbie reader.

I don't understand. Whom are you trying to impress? And what does
that have to do with the original poster's question (which isn't
quoted here, but was quoted in the article to which you replied)?

Usenet is not a
home for private messages. Everything is public.

Certainly, but answers to questions are typically addressed to the
questioner, with others able to read the answer so that they can
either learn from it, correct it, or add to it. In this case, the
questioner was the original poster; Mark, quite reasonably, answered
by posing questions intended to lead the OP to figure things out for
himself.

If you happen to be walking by a classroom when the teacher is asking
the students "What is two plus three?", do you stick your head in the
door and shout "five"?

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <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"

[Kenny McCormack]

In article <ln************ @nuthaus.mib.or g>,
Keith Thompson <ks***@mib.orgw rote:
....

>If you happen to be walking by a classroom when the teacher is asking
the students "What is two plus three?", do you stick your head in the
door and shout "five"?

Actually, CBF probably would.

[CBFalconer]

Keith Thompson wrote:

CBFalconer <cb********@yah oo.comwrites:

.... snip ...

>

>Not so. By snipping I reduced the question/answer to a minimum
that could impress a relatively newbie reader.

I don't understand. Whom are you trying to impress? And what does
that have to do with the original poster's question (which isn't
quoted here, but was quoted in the article to which you replied)?

"Marks identity" and "Marks message" have little to do with it. I
usually don't check the writers identity. As I recall I simply
cleared up a point that appeared obscure, to say the least, in the
original.

--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.