C++ language

#include<stdio.h>
#include<conio.h>
void main()
{
int sum,f1,f2,n;
f1=o;
f2=1;
cout<<"\n Enter the range";
cout<<f1<<"/t"<<f2;
cout<"\n< the series is";
for(int i=2;i<=n;i++)
{
sum=f1+f2;
cout<< fib<<"/t";
f1=f2;
f2=sum;
}
}