Sum of First N Natural Numbers using while loop in C Language

This C program calculates the sum of the first N natural numbers using a while loop. 

The user is prompted to enter a positive integer N, and the program uses a while loop to iterate from 1 to N, adding each number to a cumulative total. This demonstrates the use of looping and basic arithmetic operations in C.

#include <stdio.h>

int main() {
    int n, i = 1, sum = 0;

    printf("Enter a number: ");
    scanf("%d", &n);

    while(i <= n) {
        sum += i;
        i++;
    }

    printf("Sum = %d\n", sum);
    return 0;
}

Output:-

Enter a number: 15
Sum = 120