Question

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

Answer 1

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
	double pi = atan(1) * 4;

	cout << "pi = " << pi << endl;

	return 0;
}

/*
run:

pi = 3.14159

*/

 

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Answer 2

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
	double pi = 2 * atan(INFINITY);

	cout << "pi = " << pi << endl;

	return 0;
}

/*
run:

pi = 3.14159

*/

 

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