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Fibonacci Series Programs in C++

Fibonacci Series Programs in C++

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Let’s  see the way to learn the Fibonacci series programs using various methods in C++  like recursion, loop, array, without recursion, etc:

  1. Without the Recursion Method

Code:

#include<iostream>
using namespace std;
int main()
{
int first_num = 0, second_num = 1, third_num, i, num;
cout << “Enter random number to print fibonacci series:”;
cin >> num;
cout << “Fibonacci Series for a given number:” <<endl;
cout << first_num  <<endl;
cout << second_num << endl;
for(i = 2; i < num; ++i) //loop will starts from 2 because we have printed 0 and 1 before
{
third_num = first_num + second_num;
cout << third_num << endl;
first_num = second_num;
second_num = third_num;
}
return 0;
}

 

  1. By Using Recursion Method

Code:

#include<iostream>
using namespace std;
void FibonacciSeries(int num)
{
static int first_num = 0, second_num = 1, third_num;
if(num > 0)
{
third_num = first_num + second_num;
first_num = second_num;
second_num = third_num;
cout << third_num << endl;
FibonacciSeries(num – 1);
}
}
int main()
{
int num;
cout << “Enter random number to print fibonacci series:”;
cin >> num;
cout << “Fibonacci Series for a given number: \n” << endl;
cout << “0” << endl;
cout << “1” << endl;
FibonacciSeries (num – 2); //number-2 is used because we have already print 2 numbers
return 0;
}

 

  1. Using a For loop

Code:

#include<iostream>
using namespace std;
int main()
{
int first_num= 0, second_num = 1, third_num, i, num;
cout << “Enter random number to print fibonacci series:”;
cin >> num;
cout << “Fibonacci Series for a given number:” <<endl;
cout << first_num <<endl;
cout <<  second_num <<endl;
for(i = 0; i < num; i++) //loop will starts from 2 because we’ve got printed 0 and 1 before
{
if(i <= 1)
third_num = i;
else
{
third_num = first_num + second_num;
cout << third_num <<endl;
first_num = second_num;
second_num = third_num;
}
}
return 0;
}

 

  1. By Using While Loop

 

Code:

#include<iostream>
using namespace std;
int main()
{
int first_num = 0, second_num = 1, third_num = 0, i = 3, num;
cout << “Enter random number to print fibonacci series:” ;
cin >> num;
cout << “Fibonacci Series for a given number:” <<endl;
cout <<  first_num <<endl;
cout << second_num <<endl;
while(i <= num)
{
third_num = first_num + second_num;
cout << third_num <<endl;
first_num = second_num;
second_num = third_num;
i = i + 1;
}
return 0;
}

 

  1. Using an array

Code:

#include<iostream>
using namespace std;
int main()
{
int fibonacci[25], i, num;
cout << “Enter random number to print fibonacci series:”;
cin >> num;
fibonacci[0] = 0;
fibonacci[1] = 1;
for (i = 2; i < num; i++)
{
fibonacci[i] = fibonacci[i – 1] + fibonacci[i – 2];
}
cout <<“Fibonacci Series for a given number:” << endl;
for (i = 0; i < num; i++)
{
cout << fibonacci[i] <<endl;
}
return 0;
}

 

Fibonacci series program in C++ using specified number

Code:

#include<iostream>
using namespace std;
int main()
{
int first_num = 0, second_num = 1, third_num, i;
cout << “Fibonacci Series for a given number:”;
cout << first_num <<endl;
cout << second_num <<endl;
for(i = 2; i < 10; ++i) //loop will starts from 2 because we’ve got printed 0 and 1 before
{
third_num = first_num + second_num;
cout << third_num <<endl;
first_num = second_num;
second_num = third_num;
}
return 0;
}

 

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