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Program to print first n Fibonacci Numbers | Set 1

Following is simple program to print first n Fibonacci numbers.

fibonacci-sequence


Examples :

Input : n = 3
Output : 1 1 2

Input : n = 7
Output : 1 1 2 3 5 8 13


C++

// C++ program to print first n Fibonacci numbers 
#include <bits/stdc++.h>
using namespace std; 
  
// Function to print first n Fibonacci Numbers 
void printFibonacciNumbers(int n) 
    int f1 = 0, f2 = 1, i; 
  
    if (n < 1) 
        return
  
    for (i = 1; i <= n; i++) 
    
        cout<<f2<<" "
        int next = f1 + f2; 
        f1 = f2; 
        f2 = next; 
    
  
// Driver Code 
int main() 
    printFibonacciNumbers(7); 
    return 0; 
  
//This code is contributed by rathbhupendra

C

// C program to print first n Fibonacci numbers
#include <stdio.h>
  
// Function to print first n Fibonacci Numbers
void printFibonacciNumbers(int n)
{
    int f1 = 0, f2 = 1, i;
  
    if (n < 1)
        return;
  
    for (i = 1; i <= n; i++)
    {
        printf("%d ", f2);
        int next = f1 + f2;
        f1 = f2;
        f2 = next;
    }
}
  
// Driver Code
int main()
{
    printFibonacciNumbers(7);
    return 0;
}

Java

// Java program to print first n Fibonacci Numbers
  
class Test
{
    // Method to print first n Fibonacci Numbers
    static void printFibonacciNumbers(int n)
    {
        int f1 = 0, f2 = 1, i;
      
        if (n < 1)
            return;
      
        for (i = 1; i <= n; i++)
        {
            System.out.print(f2+" ");
            int next = f1 + f2;
            f1 = f2;
            f2 = next;
        }
    
      
    // Driver Code
    public static void main(String[] args) 
    {
        printFibonacciNumbers(7);
    }
}

Python3

# Python program to print first n 
# Fibonacci numbers
  
# Function to print first n 
# Fibonacci Numbers
def printFibonacciNumbers(n):
      
    f1 = 0
    f2 = 1
    if (n < 1):
        return
    for x in range(0, n):
        print(f2, end = " ")
        next = f1 + f2
        f1 = f2
        f2 = next
          
# Driven code
printFibonacciNumbers(7)
  
# This code is contributed by Danish Raza

C#

// C# program to print first n Fibonacci Numbers
using System;
  
class Test
{
    // Method to print first n Fibonacci Numbers
    static void printFibonacciNumbers(int n)
    {
        int f1 = 0, f2 = 1, i;
      
        if (n < 1)
            return;
      
        for (i = 1; i <= n; i++)
        {
            Console.Write(f2 + " ");
            int next = f1 + f2;
            f1 = f2;
            f2 = next;
        }
    
      
    // Driver Code
    public static void Main() 
    {
        printFibonacciNumbers(7);
    }
}
  
// This code is contributed by nitin mittal.

PHP

<?php
// PHP program to print first
// n Fibonacci numbers
  
// Function to print first n 
// Fibonacci Numbers
function printFibonacciNumbers($n)
{
    $f1 = 0;
    $f2 = 1; 
    $i;
  
    if ($n < 1)
        return;
  
    for ($i = 1; $i <= $n; $i++)
    {
        echo($f2);
        echo(" ");
        $next = $f1 + $f2;
        $f1 = $f2;
        $f2 = $next;
    }
}
  
    // Driver Code
    printFibonacciNumbers(7);
      
// This code is contributed by nitin mittal
?>


Output:

1 1 2 3 5 8 13

Time Complexity : O(n)

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