# C : Display Fibonacci Sequence

Tutorial by:Manisha Dubey      Date: 2016-06-17 03:28:54

Example on how to display the Fibonacci sequence of first n numbers (entered by the user) using loop. Also in different example, you learn to generate the Fibonacci sequence up to a certain number.

The Fibonacci sequence is a series where the next term is the sum of pervious two terms. The first two terms of the Fibonacci sequence is 0 followed by 1.

```The Fibonacci sequence: 0, 1, 1, 2, 3, 5, 8, 13, 21
```

## Example #1: Fibonacci Series up to n number of terms

``````#include <stdio.h>
int main()
{
int i, n, t1 = 0, t2 = 1, nextTerm = 0;

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

// displays the first two terms which is always 0 and 1
printf("Fibonacci Series: %d, %d, ", t1, t2);

// i = 3 because the first two terms are already dislpayed
for (i=3; i <= n; ++i)
{
nextTerm = t1 + t2;
t1 = t2;
t2 = nextTerm;
printf("%d, ",nextTerm);
}
return 0;
}``````

Output

```Enter the number of terms: 10
Fibonacci Series: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ```

## Example #2: Program to Generate Fibonacci Sequence Up to a Certain Number

``````#include <stdio.h>
int main()
{
int t1=0, t2=1, nextTerm = 0, n;

printf("Enter a positive integer: ");
scanf("%d",&n);

// displays the first two terms which is always 0 and 1
printf("Fibonacci Series: %d, %d, ", t1, t2);

nextTerm = t1+t2;

while(nextTerm < n)
{
printf("%d, ",nextTerm);
t1 = t2;
t2 = nextTerm;
nextTerm = t1+t2;
}

return 0;
}``````

Output

```
Enter a positive integer: 100
Fibonacci Series: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ```

## C

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