Write a C++ program to print Fibonacci Series up to nth term (logic explained step by step)

Here is the C++ code to print Fibonacci Series up to nth term  . It takes input for n and prints Fibonacci Series up to that number of terms. You all should have in mind how it works exactly. Here is the algorithm.

  Steps

User side

1: User asked to enter a number of nth term of Fibonacci Series

2: Screen displays Fibonacci series up to that number of terms.

Developer side

1: Declare variables that are going to be used in program .

2: Input a number for nth term of Fibonacci Series from user.

3: Pass that number to a function named "Fibonacci (int)" 

4: In the function start a loop from zero to less the number entered by user.

5: In each iteration check if the number is less than or equal to 1 display it as it is.

6: If the above condition is false do the following  

                     d = c + b;

                     c = b;

                     b = d;

7: Display the variable "d"

8: Return control back to main, So program ends here.

Code:

#include<iostream>

using namespace std;

void Fibonacci(int);

int main()

{

       int x;

       cout << "Enter number of nth term of series of Fibonacci series= ";

       cin >> x;

       Fibonacci(x);

       system("pause");

       return 0;

}

void Fibonacci(int x)

{

       int a, b = 1, c = 0, d = 0;

       for (a = 0; a < x; a++)

       {

              if (a <= 1)

              {

                     d = a;

              }

              else

              {

                     d = c + b;

                     c = b;

                     b = d;

              }

              cout << d <<"  ";

       }

       cout<<endl;

}

Output: