Question

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

Answer 1

#include <iostream>
#include <cmath>

int main()
{
    double pi = acos(-1);
 
    std::cout << "pi = " << pi << "\n";
}

 
/*
run:
 
pi = 3.14159
 
*/

 

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Answer 2

#include <iostream>
#include <cmath>

int main()
{
    double pi = 2 * acos(0.0); 
 
    std::cout << "pi = " << pi << "\n";
}

 
/*
run:
 
pi = 3.14159
 
*/

 

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