Question

How to sum the first N even numbers in C++

Answer 1

#include <iostream>

int main() {
    int n = 10;
    int even = 0, sum = 0;
 
    for (int i = 0; i < n; i++) {
        sum += even;
        std::cout << even << " ";
        even += 2;
    }
    std::cout << "\nsum = " << sum;
}




/*
run:

0 2 4 6 8 10 12 14 16 18 
sum = 90

*/

 

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