# C Program to Display Fibonacci Sequence

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. To understand this example, you should have the knowledge of following C programming topics:

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
```

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

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

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

printf("Fibonacci Series: ");

for (i = 1; i <= n; ++i)
{
printf("%d, ", t1);
nextTerm = t1 + t2;
t1 = t2;
t2 = nextTerm;
}
return 0;
}
``````

Output

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

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

``````#include <stdio.h>
int main()
{
int t1 = 0, t2 = 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, ", 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, ```