Question

How to compute arc cosine in C

Answer 1

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

int main(void)
{
    double d = acos(-1);
    
    printf("%lf", d);
    
    return 0;
}



/*
run:

3.141593

*/

 

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Answer 2

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

int main(void)
{
    float f = acosf(0);
    
    printf("%f", f);

    return 0;
}



/*
run:

1.570796

*/

 

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Answer 3

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

int main(void)
{
    long double ld = acosf(0.5);
    
    printf("%Lf", ld);

    return 0;
}



/*
run:

1.047198

*/

 

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