C Program to Generate First N Numbers of Fibonacci Series

Introduction

Generating the Fibonacci series is a common beginner-level problem in C programming. This article explains how to write a C program Fibonacci series generator using a loop and provides a simple explanation for better understanding.

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What Is the Fibonacci Series?

The Fibonacci sequence is a series of numbers starting from 0 and 1. Each number that follows is the sum of the previous two. The beginning of the sequence is:

0, 1, 1, 2, 3, 5, 8, ...

This is widely used in programming exercises and problem-solving challenges.

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C Program to Generate Fibonacci Series

#include <stdio.h>

int main() {
    int n, a = 0, b = 1, next, i;

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

    printf("Fibonacci Series: ");

    for(i = 1; i <= n; ++i) {
        printf("%d ", a);
        next = a + b;
        a = b;
        b = next;
    }

    return 0;
}

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Understanding the Program

This C program Fibonacci series uses simple logic with three variables:

• a holds the current number
• b holds the next number
• next is the sum of the two previous numbers

Using a loop, the values are printed until n terms are displayed.

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Sample Output

Enter the number of terms: 6  
Fibonacci Series: 0 1 1 2 3 5

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Why Practice Fibonacci Series in C?

Practicing this program improves your skills in:

• Loop control
• Variable updates
• Logical thinking in sequence-based problems

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Conclusion

By writing a C program Fibonacci series, beginners can understand how sequences work, how to use loops effectively, and how values are updated in each iteration. It’s a foundational exercise for all aspiring C programmers.