Example: Sum of Integers (Formula) in C

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// Sum of Integers (Formula)
#include <stdio.h>

int main() {
    // Step 1: Define the upper limit
    int n = 10;  // The number up to which we want to sum

    // Step 2: Apply the arithmetic series formula
    // Sum = n * (n + 1) / 2
    int sum = n * (n + 1) / 2;

    // Step 3: Print the calculated sum
    printf("The sum of numbers from 1 to %d using formula is: %d\n", n, sum);

    return 0;
}