Example: Fibonacci Series up to N Terms in C

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// Fibonacci Series up to N Terms
#include <stdio.h>

int main() {
    int n;
    int first_term = 0, second_term = 1;
    int next_term;

    // Step 1: Prompt user for the number of terms
    printf("Enter the number of terms (n): ");
    scanf("%d", &n);

    // Step 2: Handle edge cases for n
    if (n <= 0) {
        printf("Please enter a positive integer.\n");
    } else if (n == 1) {
        printf("Fibonacci Series: %d\n", first_term);
    } else {
        // Step 3: Print the first two terms
        printf("Fibonacci Series: %d, %d", first_term, second_term);

        // Step 4: Calculate and print subsequent terms
        for (int i = 3; i <= n; ++i) {
            next_term = first_term + second_term;
            printf(", %d", next_term);
            first_term = second_term; // Update first_term
            second_term = next_term;  // Update second_term
        }
        printf("\n");
    }

    return 0;
}