Question

How to find sum of the first N even numbers in C

Answer 1

#include <stdio.h>
 
int main() {
    int N = 5;

    // The sum of the first N even numbers is N * (N + 1)
    int sum_even = N * (N + 1);
 
    printf("The sum of the first %d even numbers is: %d\n", N, sum_even);
 
    return 0;
}
 
// 2 + 4 + 6 + 8 + 10 = 30
 
 
/*
run: 
 
The sum of the first 5 even numbers is: 30
 
*/

 

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