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help:sine function(no usage of math.h)
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QAIX > C/C++ Programming > help:sine function(no usage of math.h) 18 March 2008 17:15:38
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help:sine function(no usage of math.h)

Rakesh V. 18 March 2008 17:15:38
 hi,can anyone help in correcting this function asap:-
double mysin(double x)
{
int i=0;
float term=x;
float sinx=0;
for(i=0;i<=10;i=i+2­)
{
sinx=sinx+term;
term=term*((-x*x)/(­i+2)*(i+3));
}
return sinx;
}

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Add comment
Peternilsson42 29 September 2004 03:03:37 [ permanent link ]
 
"rakesh v." <hi2385@y...> wrote:> hi,> can anyone help in correcting this function asap:-

Asking for help 'asap' often has the opposite effect.
double mysin(double x)> {> int i=0;> float term=x;> float sinx=0;

Given that the function takes and returns a double, why are you using
(likely) less precise floats?
for(i=0;i<=10;i=i+2­)

A do/while loop would remove a redundant calculation of 'term'.
{> sinx=sinx+term;> term=term*((-x*x)/(­i+2)*(i+3));

Hint: a/b*c is parsed as (a/b)*c not a/(b*c)
}> return sinx;> }

--
Peter



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QAIX > C/C++ Programming > help:sine function(no usage of math.h) 18 March 2008 17:15:38
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