calculating fibonacci numbers c++ code example

Example: fibonacci in c++

#include<iostream>
using namespace std;
int main()
{
    int num,num1=0,num2=1,num3,i=0;
    cout<<"enter the number num"<<endl;
    cin>>num;
    for(i=1;i<=num;i++)
    {
        num3=num1+num2;
        num1=num2;
        num2=num3;
        cout<<num3<<endl;
    }

}