Write an app that tests whether the examples of the Math class actually produce the indicated results.

```
// Solution: MathTest.cs
// Testing the Math class methods.
using System;

class MathTest
{
static void Main()
{
Console.WriteLine($"Math.Abs(23.7) = {Math.Abs(23.7)}");
Console.WriteLine($"Math.Abs(0.0) = {Math.Abs(0.0)}");
Console.WriteLine($"Math.Abs(-23.7) = {Math.Abs(-23.7)}");
Console.WriteLine($"Math.Ceiling(9.2) = {Math.Ceiling(9.2)}");
Console.WriteLine($"Math.Ceiling(-9.8) = {Math.Ceiling(-9.8)}");
Console.WriteLine($"Math.Cos(0.0) = {Math.Cos(0.0)}");
Console.WriteLine($"Math.Exp(1.0) = {Math.Exp(1.0)}");
Console.WriteLine($"Math.Exp(2.0) = {Math.Exp(2.0)}");
Console.WriteLine($"Math.Floor(9.2) = {Math.Floor(9.2)}");
Console.WriteLine($"Math.Floor(-9.8) = {Math.Floor(-9.8)}");
Console.WriteLine($"Math.Log(Math.E) = {Math.Log(Math.E)}");
Console.WriteLine($"Math.Log(Math.E * Math.E) = {Math.Log(Math.E * Math.E)}");
Console.WriteLine($"Math.Max(2.3, 12.7) = {Math.Max(2.3, 12.7)}");
Console.WriteLine($"Math.Max(-2.3, -12.7) = {Math.Max(-2.3, -12.7)}");
Console.WriteLine($"Math.Min(2.3, 12.7) = {Math.Min(2.3, 12.7)}");
Console.WriteLine($"Math.Min(-2.3, -12.7) = {Math.Min(-2.3, -12.7)}");
Console.WriteLine($"Math.Pow(2.0, 7.0) = {Math.Pow(2.0, 7.0)}");
Console.WriteLine($"Math.Pow(9.0, 0.5) = {Math.Pow(9.0, 0.5)}");
Console.WriteLine($"Math.Sin(0.0) = {Math.Sin(0.0)}");
Console.WriteLine($"Math.Sqrt(900.0) = {Math.Sqrt(900.0)}");
Console.WriteLine($"Math.Tan(0.0) = {Math.Tan(0.0)}");
}
}
```

Math.Abs(23.7) = 23.7
Math.Abs(0.0) = 0
Math.Abs(-23.7) = 23.7
Math.Ceiling(9.2) = 10
Math.Ceiling(-9.8) = -9
Math.Cos(0.0) = 1
Math.Exp(1.0) = 2.71828182845905
Math.Exp(2.0) = 7.38905609893065
Math.Floor(9.2) = 9
Math.Floor(-9.8) = -10
Math.Log(Math.E) = 1
Math.Log(Math.E * Math.E) = 2
Math.Max(2.3, 12.7) = 12.7
Math.Max(-2.3, -12.7) = -2.3
Math.Min(2.3, 12.7) = 2.3
Math.Min(-2.3, -12.7) = -12.7
Math.Pow(2.0, 7.0) = 128
Math.Pow(9.0, 0.5) = 3
Math.Sin(0.0) = 0
Math.Sqrt(900.0) = 30
Math.Tan(0.0) = 0