Fibonacci Series.

C++ Code

#include<iostream>
using namespace std;
int main()
{
int a=0,b=1,r,i,c;
cout<<"Enter range=";
cin>>r;

if (r>0)
{
cout<<a<<" "<<b<<" ";
}

    i=3;
    while (i<=r)
{
    c=a+b;
    cout<<c<<" ";
    a=b;
    b=c;
    i++;
}
}