Question

Write the code (in a function) that allows the user to display the first “nb” of elements in the Fibonacci sequence (each value on a separate line in the console).

The order of the Fibonacci sequence goes as follows: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144 and on to infinity. Each number is the sum of the previous two (with the 2 starting numbers being 1 and 1). This series of numbers is known as the Fibonacci numbers or the Fibonacci sequence.

The function name should be “fibonacci” and it should take an integer as a parameter (argument), i.e. “fibonacci(int nb)”.

When called the function should respond as follows:

Function call:

fibonacci(1);

Console result:

1

Function call:

fibonacci(2);

Console result:

1

1

Function call:

fibonacci(3);

Console result:

1

1

2

And so on, …

Answer 1

ANS:

#include<string>
#include<iostream>
using namespace std;

void fibonacci(int nb)
{
   cout<<"PROGRAM OF FIBONACCI"<<endl;
   int x=1;
   int x2=1;
   int next=0;
   for(int i=1;i<=nb;i++)
   {
       if(i==1)
       {
           cout<<x<<endl;
           continue;
       }
      
       if(i==2)
       {
           cout<<x2<<endl;
           continue;
          
       }
      
       next=x+x2;
       x=x2;
       x2=next;
      
       cout<<next<<endl;
      
   }
}

int main()
{
   cout<<"NB=3"<<endl;
   fibonacci(3);
   cout<<endl<<endl<<"NB=2"<<endl;
       fibonacci(2);
  
}

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