C Program to Print Fibonacci Series.

The Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones, starting from 0 and 1. The series is represented as 0, 1, 1, 2, 3, 5, 8, 13, 21, and so on. In other words, each number in the series (after the first two numbers) is the sum of the two preceding ones.

In this article, we are going to print the Fibonacci series using C programming.

Algorithm to Print Fibonacci Series.

• Input the number of terms 'n' from the user.
• Initialize variables 'first' and 'second' as 0 and 1, respectively, representing the first two numbers of the series.
• Print the first two numbers of the series, i.e., 0 and 1.
• Use a loop to calculate and print the subsequent terms of the series.
• In each iteration, calculate the next term as the sum of the 'first' and 'second'.
• Update 'first' to the value of 'second' and 'second' to the value of the newly calculated term.
• Repeat steps 4 to 6 'n-2' times, as the first two numbers are already printed. 

//c program for fibonacci sequqence.
#include <stdio.h>

int main() {
    int n, first = 0, second = 1, next;

    printf("Enter the number of terms in the Fibonacci series: ");
    scanf("%d", &n);

    printf("Fibonacci Series: ");

    // Print the first two terms
    printf("%d, %d", first, second);

    // Calculate and print the subsequent terms
    for (int i = 2; i < n; i++) {
        next = first + second;
        printf(", %d", next);

        // Update first and second for the next iteration
        first = second;
        second = next;
    }

    printf("\n");
    return 0;
}

Enter the number of terms in the Fibonacci series: 7
Fibonacci Series: 0, 1, 1, 2, 3, 5, 8