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Examples of normal and exceptional aspects
Normal aspects and exceptional aspects - anticipated or non-anticipated
  public static long Factorial(int n){
    if (n == 0)
      return 1;
    else return n * Factorial(n - 1);
  }
1.   Negative input

2.   Wrong type of input

3.   Wrong type of multiplication

4.   Numeric overflow

5.   Out of memory

6.   Loss of power

7.   Machine failure

8.   Sun failure

fac3.cs
An iterative Factorial function.
fac4.cs
An iterative Factorial function with a precondition - not C# 3.0.