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In this tutorial, you will learn and get code about printing of Fibonacci series with and without using fuction. But before going through the program, let's first understand about Fibonacci series.

Fibonacci series is a series of numbers, starts from **0** and **1**. Thereafter, the next number will be the
summation of previous two numbers. For example,

0 1 1 2 3 5 8 13 21.....

That is, the first and second number is 0 and 1, thereafter

- third number = first+second
- Therefore, third number = 0+1 (equals 1)
- fourth number = third+second
- Thereafter, fourth number = 1+1 (equals 2)
- fifth number = fourth+third
- Thereafter, fifth number = 2+1 (equals 3)
- and so on

Now let's move on and implement it in a C program.

The question is, **write a program in C to print Fibonacci series upto N term. The value of N must be taken
by user (at run-time).** The answer to this question is:

// Print Fibonacci Series // ----codescracker.com---- #include<stdio.h> #include<conio.h> int main() { int a=0, b=1, c, N, temp, i; printf("Enter the value of N (limit): "); scanf("%d", &N); for(i=1; i<=N; i++) { if(i==1) c = 0; else if(i==2 || i==3) c = 1; else { temp = a; a = b; b = c; c = a+b; } if(i==N) printf("%d", c); else printf("%d, ", c); } getch(); return 0; }

As the program was written under **Code::Blocks** IDE, therefore after successful build and run, you will get
the following output:

Provide the value of N (limit), that is how many term of fibonacci series you wants to print:

- Initialize the first number say
**a**with 0 and the second number say**b**with 1 at beginning of the program - Receive the value of limit say
**N** - Create a for loop to run from
**1**to**N**(the limit provided by user at run-time) - Inside the
**for**loop:- initialize
**0**to third number say**c**if**i**is equal to 1 - initialize
**1**to third number say**c**if**i**is equal to 2 or 3 - otherwise, initialize the summation of first and second number say
**a+b**to the third number say**c**

- initialize
- Before initializing
**a+b**to**c**, make sure to initialize**b**to**a**and**c**to**b**using**temp**variable - Then print the value of third number say
**c**

Here is another program that works same as of previous one. The only difference is that this program uses
a user-defined function **printFibo()** to print the Fibonacci series:

// Fibonacci Series using Function // ----codescracker.com---- #include<stdio.h> #include<conio.h> void printFibo(int); int main() { int N; printf("Enter the value of N (limit): "); scanf("%d", &N); printFibo(N); getch(); return 0; } void printFibo(int n) { int i, a=1, b=1, c, temp; for(i=1; i<=n; i++) { if(i==1) c = 0; else if(i==2 || i==3) c = 1; else { temp = a; a = b; b = c; c = a+b; } if(i==n) printf("%d", c); else printf("%d, ", c); } }

Here is the final snapshot of the first sample run:

Here is the final snapshot of another sample run:

Let's modify the previous program that will also print the Fibonacci series but using the function that returns values. Here we have created a function in such a way that it will return each and every term of Fibonacci series one by one:

// Print Fibonacci Series using Function // ----codescracker.com---- #include<stdio.h> #include<conio.h> int getFibo(int); int main() { int N, i, fib; printf("Enter the value of N (limit): "); scanf("%d", &N); for(i=1; i<=N; i++) { fib = getFibo(i); if(i==N) printf("%d", fib); else printf("%d, ", fib); } getch(); return 0; } int getFibo(int i) { static int a=0, b=1, c; int temp; if(i==1) c = 0; else if(i==2 || i==3) c = 1; else { temp = a; a = b; b = c; c = a+b; } return c; }

Here is the final snapshot of the sample run of above program that was created using function with return value:

If user supplies the limit as **10**, then 10 starting term of Fibonacci series will be printed at output screen
and the function created in above program named **getFibo()** will also run 10 times to return each and every term
of Fibonacci series one by one.

Here I've used **static** type variable for **a**, **b** and **c** to remember its previous value
throughout the program.

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