C programming, Calculating the sum of natural numbers.

#include <stdio.h>

int main() {

    int n, i, sum = 0;

    printf("Enter a positive integer: ");

    scanf("%d", &n);

    for (i = 1; i <= n; ++i) {

        sum += i;

    }

    printf("Sum = %d", sum);

    return 0;

}