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Following program shows you how to print sum of n natural numbers.
In this program we get number from user and shows sum of n natural numbers using following formula
Sum of n natural numbers = input X (input + 1)/2

#include <iostream>

int main() {
    int input;
    std::cout << "Enter a number:";
    std::cin >> input;
    int result = input * (input + 1) / 2;
    std::cout << "Sum of n natural numbers is: " << result;
}

Output:

Enter a number: 12
Sum of n natural numbers is: 78



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