The Code and output are inconsistent at Listing 1.21: Commenting Your Code and Output 1.7

Listing 1.21: Commenting Your Code

``` csharp
Console.WriteLine("Your full name is {1}, {0}.", firstName, lastName);
```
Output 1.7 is
``` sh
Hey you!
Enter your first name: Inigo
Enter your last name: Montoya
Your full name is Inigo Montoya.
```

It should be modified as bellow
``` csharp
Console.WriteLine("Your full name is {0} {1}.", firstName, lastName);
```