Question

How to use variable template in C++

Answer 1

#include <iostream>

template<class T>
constexpr T pi = T(3.141592653589793238L);

int main() {
    int i = pi<int>; 
    float f = pi<float>; 
    double d = pi<double>; 
   
    std::cout << i << "\n";
    std::cout << f << "\n";
    std::cout << d << "\n";
}




/*
run:

3
3.14159
3.14159

*/

 

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