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How would I get the code below to time both the iterative version and the recursive

version of the Fibonacci function so that I can see which one is faster. I already have the timer.h file to go along with it. I'm thinking i should use t.start() and t.stop() to time it. help please? thank you!

```
#include <iostream>
using namespace std;
#include "timer.h"
unsigned iterFibonacci(unsigned n);
unsigned recFibonacci(unsigned n);
int main()
{
Timer t;
unsigned x;
cout << "Please enter a positive integer: ";
cin >> x;
// Now print the result of the iterative version of the function
cout << "Iterative fib(" << x << ") = " << iterFibonacci(x) << endl;
// Now print the result of the recursive version of the function
// cout << "Recursive fib(" << x << ") = " << recFibonacci(x) << endl;
}
//--- Definition of iterFibonacci()
unsigned iterFibonacci(unsigned n)
{
int
nextFib = 1, // the next Fibonacci number to be calculated
previousFib = 1, // the Fibonacci number before it
beforePreviousFib; // the Fibonacci number before that one
for (int i = 3; i <= n; i++)
{
// First, update the previous and before previous values
beforePreviousFib = previousFib;
previousFib = nextFib;
// Then compute the next Fibonacci value
nextFib = previousFib + beforePreviousFib;
}
return nextFib;
}
//--- Definition of recFibonacci()
unsigned recFibonacci(unsigned n)
{
// Add statements for RecFibonacci() here
}
```