C Programs for Fibonacci Series

Here's the C Program to print the complete Fibonacci series of n number (n = number entered by the user at runtime).

Also, in a different example, you can generate Fibonacci series up to a certain number, like 100 or 50 whatever you want.

In Fibonacci series, the next number is the sum of previous two numbers,

For Example : 0, 1 , 1, 2, 3, 5, 8, 13, 21 and so on..

C Programs for Fibonacci Series

1. Fibonacci Series Using For Loop

	#include <stdio.h>
	void main()
	{
	int i, n, n1 = 0, n2 = 1, nextTerm;
	printf("Enter the number of terms: ");
	scanf("%d", &n);
	printf("Fibonacci Series: ");
	for (i = 1; i <= n; ++i)
	{
	printf("%d, ", n1);
	nextTerm = n1 + n2;
	n1 = n2;
	n2 = nextTerm;
	}
	}

view raw Fibonacci-Series-for-loop.c hosted with ❤ by GitHub

2. Fibonacci Series Using While Loop

	#include <stdio.h>
	void main()
	{
	int n1 = 0, n2 = 1, nextTerm = 0, n;
	printf("Enter a positive number: ");
	scanf("%d", &n);
	// displays the first two terms which is always 0 and 1
	printf("Fibonacci Series: %d, %d, ", n1, n2);
	nextTerm = n1 + n2;
	while(nextTerm <= n)
	{
	printf("%d, ",nextTerm);
	n1 = n2;
	n2 = nextTerm;
	nextTerm = n1 + n2;
	}
	}

view raw Fibonacci-Series-while-loop.c hosted with ❤ by GitHub

Related:

• Marksheet in C.
• Calculator Using If-else in C.
• Fahrenheit into Celsius in C.
• C program for Even or Odd.