Example: Sum of First N Even Numbers (Loop-based) in C++

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// Sum of First N Even Numbers (Loop-based)
#include <iostream>
using namespace std;

int main() {
    // Step 1: Define the number of terms
    int N = 5; // Example: Sum of the first 5 even numbers (2+4+6+8+10)

    // Step 2: Initialize a variable to store the sum
    int sum = 0;

    // Step 3: Use a loop to iterate and add each even number
    cout << "Calculating sum of first " << N << " even numbers:" << endl;
    for (int i = 1; i <= N; ++i) {
        int evenNumber = 2 * i; // Calculate the current even number (2, 4, 6, ...)
        sum += evenNumber;      // Add it to the total sum
    }

    // Step 4: Print the final sum
    cout << "The sum is: " << sum << endl;

    return 0;
}