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hi!every one !

jim

i am new to c and turboc.
and i am learning it .
i hope you can help me .
thanks .

Mar 14 '06 #1
7 1368
jim
#include<stdio.h>
#include<math.h>
void main()
{
float x,y,z;
scanf("%f,%f\n",&x,&y) ;

z=(fabs(x)-2)*(fabs(x)-2)+(fabs(y)-2)*(fabs(y)-2)-1;
if(z<=1e-6)
{
printf("the height of the dot is 10 m .\n");
}
else
printf("the height of the dot is 0 m .\n");

}
i wote it,but it can not run rightly!
would u tell me what is wrong with it ?
thanks

Mar 14 '06 #2
jim wrote:
#include<stdio.h>
#include<math.h>
void main()
{
float x,y,z;
scanf("%f,%f\n",&x,&y) ;

z=(fabs(x)-2)*(fabs(x)-2)+(fabs(y)-2)*(fabs(y)-2)-1;
if(z<=1e-6)
{
printf("the height of the dot is 10 m .\n");
}
else
printf("the height of the dot is 0 m .\n");

}
i wote it,but it can not run rightly!
would u tell me what is wrong with it ?
thanks


Which inputs do you expect to produce which outputs? What is the code
trying to solve for you?

--
==============
Not a pedant
==============
Mar 14 '06 #3
jim said:
#include<stdio.h>
#include<math.h>
void main()
main returns int, not void. So make that:

int main(void)
{
float x,y,z;
scanf("%f,%f\n",&x,&y) ;
scanf returns a value, which you need to check, in case something went
wrong.

z=(fabs(x)-2)*(fabs(x)-2)+(fabs(y)-2)*(fabs(y)-2)-1;
What is this supposed to do? Let's assume that x has the value 3.0, and y
has the value 4.0.

fabs(3.0) is 3.0.

fabs(3.0) - 2 is 1.0.

(fabs(3.0) - 2) * (fabs(3.0) - 2) is 1.0.

fabs(4.0) is 4.0.

fabs(4.0) - 2 is 2.0.

(fabs(4.0) - 2) * (fabs(4.0) - 2) is 4.0.

(fabs(3.0) - 2) * (fabs(3.0) - 2) + (fabs(4.0) - 2) * (fabs(4.0) - 2) is
5.0.

(fabs(3.0) - 2) * (fabs(3.0) - 2) + (fabs(4.0) - 2) * (fabs(4.0) - 2) - 1 is
4.0.

So z takes the value 4.0.

Is that what you were expecting?


if(z<=1e-6)
{
printf("the height of the dot is 10 m .\n");
}
else
printf("the height of the dot is 0 m .\n");


main returns int, so add:

return 0;

}
i wote it,but it can not run rightly!


What do you mean by "run rightly"? What is it supposed to do?

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: rjh at above domain (but drop the www, obviously)
Mar 14 '06 #4
On Tuesday 14 March 2006 11:06, jim opined (in
<11**********************@i40g2000cwc.googlegroups .com>):
i am new to c and turboc.
and i am learning it .
i hope you can help me .


And your question was? Once you have one, you're more than welcome to
post it here. Before you do, please read and heed:
<http://cfaj.freeshell.org/google/>. This one
<http://clc-wiki.net/wiki/Introduction_to_comp.lang.c> is also useful
if you want to avoid friction with the regulars.

--
BR, Vladimir

Power is danger.
-- The Centurion, "Balance of Terror", stardate 1709.2

Mar 14 '06 #5

"jim" <ab********@gmail.com> wrote in message
news:11**********************@j52g2000cwj.googlegr oups.com...
#include<stdio.h>
#include<math.h>
void main()
{
float x,y,z;
scanf("%f,%f\n",&x,&y) ;

[snip]


Your problem might just be the scanf format. scanf is very picky, not easy
to master, and possibly not worth it. For now though, changing the format
to just "%f%f" might do what you want

--
RSH

Mar 14 '06 #6

"Robin Haigh" <ec*****@leeds.ac.uk> wrote in message
news:dv**********@newsg1.svr.pol.co.uk...

"jim" <ab********@gmail.com> wrote in message
news:11**********************@j52g2000cwj.googlegr oups.com...
#include<stdio.h>
#include<math.h>
void main()
{
float x,y,z;
scanf("%f,%f\n",&x,&y) ;

[snip]
Your problem might just be the scanf format. scanf is very picky, not

easy to master, and possibly not worth it. For now though, changing the format
to just "%f%f" might do what you want


Nice call. With a TTF, I can't even see that comma...

RP
Mar 14 '06 #7
jim
thank u very much
and i have knewn what is wrong with it

Mar 15 '06 #8

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