I would like to have precision upto atleast 8 digits in my numerical
computation program. I have tried using doubles but I keep getting
results only till 6 places after decimal. eg.

#include <stdio.h>
#define M_PI 3.14159265358979323846 /* M_PI is not defined in math.h
according to my compiler*/

int main(void)
{
double s;
s = M_PI;
printf("%f", s);


return 0;

}

>I would like to have precision upto atleast 8 digits in my numerical
>computation program. I have tried using doubles but I keep getting
>results only till 6 places after decimal. eg.

You only *print* 6 digits after the decimal. You may be getting greater
precision in the actual computation.

Try: printf("%300.200f", s);
although this is primarily useful for debugging. A double won't
have nearly this many digits of precision.

>#include <stdio.h>
>#define M_PI 3.14159265358979323846 /* M_PI is not defined in math.h
>according to my compiler*/
>
>int main(void)
>{
> double s;
> s = M_PI;
> printf("%f", s);
>
>
>return 0;
>
>}

In article <bdd6faac-50e6-4052-9699-35517b3955e9@q27g2000prf.googlegroups.com>,
pereges <Broli00@gmail.com> wrote:
>I would like to have precision upto atleast 8 digits in my numerical
>computation program. I have tried using doubles but I keep getting
>results only till 6 places after decimal. eg.

>#include <stdio.h>
>#define M_PI 3.14159265358979323846 /* M_PI is not defined in math.h
>according to my compiler*/

>int main(void)
>{
> double s;
> s = M_PI;
> printf("%f", s);
>return 0;
>}

Specify a precision with your %f format, such as %.60f . The default
for %f is 6.

Also, to be safe, ensure your output ends in a newline. For example,

printf("%.9f\n", s);

--
Q: Why did the chicken cross the Mobius strip?

A: There were manifold reasons.

On Apr 10, 8:53pm, pereges <Brol...@gmail.com> wrote:
> I would like to have precision upto atleast 8 digits in my numerical
> computation program. I have tried using doubles but I keep getting
> results only till 6 places after decimal. eg.
>
> #include <stdio.h>
> #define M_PI 3.14159265358979323846 /* M_PI is not defined in math.h
> according to my compiler*/
>
> int main(void)
> {
> double s;
> s = M_PI;
> printf("%f", s);
>
> return 0;
>
>
>
> }

Try it this way:

#include <stdio.h>
#include <float.h>
static const double pi_approximation =
3.1415926535897932384626433832795;

int main(void) {
printf("My pi approximation is %.*g\n", DBL_DIG + 1,
pi_approximation);
return 0;
}

On Apr 11, 11:10 am, user923005 <dcor...@connx.com> wrote:
> On Apr 10, 8:53 pm, pereges <Brol...@gmail.com> wrote:
>
>
>
> > I would like to have precision upto atleast 8 digits in my numerical
> > computation program. I have tried using doubles but I keep getting
> > results only till 6 places after decimal. eg.
>
> > #include <stdio.h>
> > #define M_PI 3.14159265358979323846 /* M_PI is not defined in math.h
> > according to my compiler*/
>
> > int main(void)
> > {
> > double s;
> > s = M_PI;
> > printf("%f", s);
>
> > return 0;
>
> > }
>
> Try it this way:
>
> #include <stdio.h>
> #include <float.h>
> static const double pi_approximation =
> 3.1415926535897932384626433832795;
>
> int main(void) {
> printf("My pi approximation is %.*g\n", DBL_DIG + 1,
> pi_approximation);
> return 0;
>
> }

why declare pi_approximation as a static const ?

pereges said:

<snip>

> why declare pi_approximation as a static const ?

Were you planning on changing it?


--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

On Apr 11, 12:05 pm, Richard Heathfield <r...@see.sig.invalid> wrote:
> pereges said:
>
> <snip>
>
> > why declare pi_approximation as a static const ?
>
> Were you planning on changing it?
>


if you are not planning to change it, then declare it as const. what
is the purpose behind declaring it as static ?

On Apr 11, 12:05 pm, Richard Heathfield <r...@see.sig.invalid> wrote:
> pereges said:
>
> <snip>
>
> > why declare pi_approximation as a static const ?
>
> Were you planning on changing it?
>


if you are not planning to change it, then declare it as const. what
is the purpose behind declaring it as static ?