First sum of natural numbers in C language

The actual calculation behind:-

1. while(i<=n) {

    sum = sum + i;

    i++;

}

or

2. for(i = 1; i<=n; i++) {
sum += i; // sum = sum + i;
}

advantages of for loop:-
-  more easier.
- makes code concise and more clean.

// First sum of natural numbers in C language

#include <stdio.h>

int main() {

    int n, sum = 0; /// sum = 0 stores the number in memory

    printf("Enter your first N natural number: ");

    scanf("%d", &n);

    

    // Using a loop to calculate the sum

    // for(int i = 1; i <= n; i++) {

    //     printf("%d\n", i);

    //     sum += i;

    // }

    sum = (n*(n+1))/2;

    

    printf("The first sum of %d Natural numbers are: %d\n", n, sum);

    

    

    return 0;

}

FORMULA:-