Question

How to make calulation at compile time in C++

Answer 1

#include <iostream>

constexpr int sum_of_1_to_n(const int n) {
	return n * (n + 1) / 2;
}

int main() {
    const int n = 5;
    
    auto sum = sum_of_1_to_n(n);

    std::cout << sum;
}
 
 
 
 
/*
run:
 
15
 
*/

 

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