C Program to display Fibonacci Series | Brown Code It

This is a C program to calculate Fibonacci numbers upto n number.

Fibonacci sequence is a set of numbers that starts with a one or a zero, followed by a one, and proceeds based on the rule that each number (called a Fibonacci number) is equal to the sum of the preceding two numbers. ... F (0) = 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89
like here, sum of 0 and 1 equals to 1   also sum of 1 and 1 equals to 2 also sum of 1 and 2 equals to 3 and so on.

Source Code:

1. #include <stdio.h>
2.  
3. 
   
4. int main()
5. {
6.               //Variable Declaration.
7.   int n, first = 0, second = 1, next, c;
8.         //Take Input.
9.   printf("Enter the number of terms\n");
10.   scanf("%d", &n);
11.  
12.   printf("First %d terms of Fibonacci series are:\n", n);
13.      //Working Formula
14.   for (c = 0; c < n; c++)
15.   {
16.     if (c <= 1)
17.       next = c;
18.     else
19.     {
20.       next = first + second;
21.       first = second;
22.       second = next;
23.     }
24.     printf("%d\t", next);
25.   }
26.  
27.   return 0;
28. }

Output:

Enter the number of terms

10

First 10 terms of Fibonacci series are:

0       1       1       2       3       5       8       13      21      34

Enter the number of terms

20

First 20 terms of Fibonacci series are:

0       1       1       2       3       5       8       13      21      34      55      89      144     233     377

        610     987     1597    2584    4181