Question

How to use acos() to compute PI in C

Answer 1

#include <stdio.h>
#include <math.h>
 
int main(void)
{
    double PI = acos(-1);
   
    printf("acos(-1) = %f", PI);
 
    return 0;
}
  
/*
run:
 
acos(-1) = 3.141593

*/

 

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