Question

How to use the PI constant in C++

Answer 1

#include <iostream>
#include <iomanip>
#include <cmath>

int main() {
    std::cout << M_PI << "\n";

    double pi = M_PI;
    std::cout << std::setprecision(12) << pi;
    
    return 0;
}




/*
run:

3.14159
3.14159265359

*/

 

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