Round #741

Use string interpolation to format a name and age into a sentence.

```csharp using System; class Program { static void Main() { string name = "John"; int age = 30; Console.WriteLine($"{name} is {age} years old."); } } ```

```csharp using System; class Program { static void Main() { string name = "John"; int age = 30; // Using string interpolation to format the sentence string sentence = $"My name is {name} and I am {age} years old."; Console.WriteLine(sentence); } } ``` This C# code uses string interpolation to format a sentence with a name and age. The `$` symbol before the string indicates that it's an interpolated string, allowing the use of expressions inside curly braces `{}`. The `name` and `age` variables are inserted into the string, creating a formatted sentence that is then printed to the console.