Question

How to declare PI constant in C++

Answer 1

#include <iostream>
#include <iomanip>

#define PI 3.141592653589793238462643383279

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

    double pi = PI;
    std::cout << std::setprecision(12) << pi;
}




/*
run:

3.14159
3.14159265359

*/

 

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