Example: Fibonacci Series up to 100 in C using Recursion

// Fibonacci Series up to 100 in C using Recursion
#include <stdio.h>

// Recursive Function to generate the Fibonacci series
int rec_fibonacci(int num, int term_1, int term_2, int next_term)
{
    printf("%d, ", next_term);
    term_1 = term_2;
    term_2 = next_term;
    next_term = term_1 + term_2;
    if (next_term <= num)
        rec_fibonacci(num, term_1, term_2, next_term);
    else
        return 0;
}

// It's the main function of the program
int main()
{
    int num;
    int term_1 = 0, term_2 = 1, next_term = 0;

    // Step-1 Take input from the User
    printf("INPUT POSITIVE NUMBER: ");
    scanf("%d", &num);

    // Step-2 Print the first two terms which are always 0 and 1
    printf("\nFIBONACCI SERIES: %d, %d, ", term_1, term_2);
    next_term = term_1 + term_2;

    // Step-3 Call the recursive function:rec_fibonacci() to generate the fibonacci series
    rec_fibonacci(num, term_1, term_2, next_term);

    return 0;
}