Question

How to compute arc tangent in C

Answer 1

#include <stdio.h>
#include <math.h>

int main(void)
{
    double d = atan(1);

    printf("%lf", d);
}




/*
run:

0.785398

*/

 

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Answer 2

#include <stdio.h>
#include <math.h>

int main(void)
{
    float f = atanf(0.5);

    printf("%f", f);
}



/*
run:

0.463648

*/

 

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Answer 3

#include <stdio.h>
#include <math.h>

int main(void)
{
    long double ld = atan(-1.0);

    printf("%Lf", ld);
}



/*
run:

-0.785398

*/

 

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