### Fibonacci series in C++ language:

In this article, you’ll learn how to create the Fibonacci series program in C++ language to print first N terms of Fibonacci series, without giving input from the keyboard or giving input from the keyboard.

Q: What is the Fibonacci series.

Ans: A series of number in which each number is the sum of the two preceding numbers is known as Fibonacci series. In Fibonacci series two number is fixed i.e., 0 and 1 then we create the third number by adding the previous two number.

A simple example of Fibonacci series 0,1,1,2,3,5,8,13, etc. here each number is the sum of the previous two number.

Q: Write a program in C++ language to print first x term of Fibonacci series, without input from the keyboard, the value of x is 7.

Solution:

#include<iostream>
using namespace std; int main() { int n1=-1,n2=1,x=7,i,temp; for(i=1;i<=x;i++) { temp=n1+n2; cout<<temp<<“\t”; n1=n2; n2=temp; } return 0; } |

The output of this program:
0 1 1 2 3 5 8 |

Note: In the above program we take five variable n1 =-1 , n2 =1, x=7, i and temp. here we take n=-1 and n2=1 with the sum of n1 and n2 we get the first number of the Fibonacci series, then store the sum in the temp variable. Variable I is used for loop and its initial value is 1 rotate up to the value of x. for this program the value of x is 7, it means you want to show a Fibonacci series which have 7 number.

Q: Write a program in C++ language to print first x term of Fibonacci series, with input from the keyboard, the value of x is 10.

Solution:

#include<iostream>
using namespace std; int main() { int n1=-1,n2=1,x,i,temp; cout<<“Enter how many number u want to print: “; cin>>x; for(i=1;i<=x;i++) { temp=n1+n2; cout<<temp<<“\t”; n1=n2; n2=temp; } return 0; } |

The Output of this program:
Enter how many number u want to print: 10 0 1 1 2 3 5 8 13 21 34 |

#### You may also learn the following programming:

- Program to check prime number in C++ language
- Program to print all prime number between two number in C++ language
- Program to reverse a number in C++ language.