Program to print first n Fibonacci Numbers

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

Recommended: Please solve it on “PRACTICE ” first, before moving on to the solution.

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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My Personal Notes

Program to print first n Fibonacci Numbers | Set 1

Recommended: Please solve it on “PRACTICE ” first, before moving on to the solution.

C++

C

Java

Python3

C#

PHP

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