Question

How to calculate PI value with acos() function in C

Answer 1

#include <stdio.h>     
#include <math.h>
  
int main()
{   
    double pi = acos(-1);
     
    printf("pi = %lf\n", pi);
     
    return 0;
}

  
/*
run:
    
pi = 3.141593
 
*/

 

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Answer 2

#include <stdio.h>     
#include <math.h>
  
int main()
{   
    double pi = 2 * acos(0.0); 
     
    printf("pi = %lf\n", pi);
     
    return 0;
}


  
/*
run:
    
pi = 3.141593
 
*/

 

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