Question

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

Answer 1

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

int main(int argc, char **argv)
{   
	double pi = atan(1) * 4;
	
	printf("pi = %f\n", pi);
	
    return 0;
}
 
/*
run:
   
pi = 3.141593

*/

 

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Answer 2

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

int main(int argc, char **argv)
{   
	double pi = 2 * atan(INFINITY);
     
    printf("pi = %f\n", pi);
	
    return 0;
}
 
/*
run:
   
pi = 3.141593

*/

 

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