## C Program to display Fibonacci series

June 5, 2021

In this tutorial, we will learn two following ways to display Fibonacci series in C programming language:
1) Using For loop
2) Using recursion

### Fibonacci Series in C using loop

A simple for loop to display the series. Program prompts user for the number of terms and displays the series having the same number of terms.

```#include<stdio.h>
int main()
{
int count, first_term = 0, second_term = 1, next_term, i;

//Ask user to input number of terms
printf("Enter the number of terms:\n");
scanf("%d",&count);

printf("First %d terms of Fibonacci series:\n",count);
for ( i = 0 ; i < count ; i++ )
{
if ( i <= 1 )
next_term = i;
else
{
next_term = first_term + second_term;
first_term = second_term;
second_term = next_term;
}
printf("%d\n",next_term);
}

return 0;
}```

Output:

```Enter the number of terms: 8
First 8 terms of Fibonacci series:
0
1
1
2
3
5
8
13```

### Program to display Fibonacci series using recursion

Here we are using a user defined function fibonacci_series() that calls itself recursively, in order to display series for the entered number of terms.

```#include<stdio.h>
int fibonacci_series(int);
int main()
{
int count, c = 0, i;
printf("Enter number of terms:");
scanf("%d",&count);

printf("\nFibonacci series:\n");
for ( i = 1 ; i <= count ; i++ )
{
printf("%d\n", fibonacci_series(c));
c++;
}

return 0;
}
int fibonacci_series(int num)
{
if ( num == 0 )
return 0;
else if ( num == 1 )
return 1;
else
return ( fibonacci_series(num-1) + fibonacci_series(num-2) );
}```

Output:

```Enter number of terms: 6
Fibonacci series:
0
1
1
2
3
5```