Write a C program to print Fibonacci series up to n terms using loop. How to generate Fibonacci series up to n terms using loops in C programming. Logic to print Fibonacci series in a given range in C programming.

**Example**

**Input**

Input number of terms: 10

**Output**

Fibonacci series: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34

## Required knowledge

Basic C programming, If statement, For loop, While loop

### What is Fibonacci series?

Fibonacci series is a series of numbers where the current number is the sum of previous two terms. For Example: 0, 1, 1, 2, 3, 5, 8, 13, 21, ... , (n-1th + n-2th)

## Logic to print Fibonacci series upto n terms

Step by step descriptive logic to print n Fibonacci terms.

- Input number of Fibonacci terms to print from user. Store it in a variable say
`terms`. - Declare and initialize three variables, I call it as Fibonacci magic initialization.
`a=0`

,`b=1`

and`c=0`

.Here

`c`is the current term,`b`is the n-1^{th}term and`a`is n-2^{th}term. - Run a loop from 1 to
`terms`, increment loop counter by 1. The loop structure should look like`for(i=1; i<=term; i++)`

. It will iterate through`n`terms - Inside the loop copy the value of n-1
^{th}term to n-2^{th}term i.e.`a = b`

.Next, copy the value of n

^{th}to n-1^{th}term`b = c`

.Finally compute the new term by adding previous two terms i.e.

`c = a + b`

. - Print the value of current Fibonacci term i.e.
`c`.

## Program to print Fibonacci series up to n terms

```
/**
* C program to print Fibonacci series up to n terms
*/
#include <stdio.h>
int main()
{
int a, b, c, i, terms;
/* Input number from user */
printf("Enter number of terms: ");
scanf("%d", &terms);
/* Fibonacci magic initialization */
a = 0;
b = 1;
c = 0;
printf("Fibonacci terms: \n");
/* Iterate through n terms */
for(i=1; i<=terms; i++)
{
printf("%d, ", c);
a = b; // Copy n-1 to n-2
b = c; // Copy current to n-1
c = a + b; // New term
}
return 0;
}
```

Move a step forward and advance your programming skills by learning this program using recursive approach.

Learn more - Program to find nth Fibonacci series using recursion.

Output

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

Let us modify the above code to print Fibonacci series between a given range.

## Program to print Fibonacci series in given range

```
/**
* C program to print Fibonacci series in given range
*/
#include <stdio.h>
int main()
{
int a, b, c, start, end;
/* Input a number from user */
printf("Enter starting term: ");
scanf("%d", &start);
printf("Enter end term: ");
scanf("%d", &end);
/* Fibonacci magic initialization */
a = 0;
b = 1;
c = 0;
printf("Fibonacci terms: \n");
/* Iterate through terms */
while(c <= end)
{
/* If current term is greater than start term */
if(c >= start)
{
printf("%d, ", c);
}
a = b; // Copy n-1 to n-2
b = c; // Copy current to n-1
c = a + b; // New term
}
return 0;
}
```

Output

Enter starting term: 4 Enter end term: 30 Fibonacci terms: 5, 8, 13, 21,

Happy coding 😉

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