[sureLoss]

Its an issue of integer division.

when you divide an integer by an integer it will return an integer. For example 25/100 will return 0 but 25/100.0 will return 0.25 in most programming languages.

You need to cast the divisor to a float.

Console.WriteLine("Number of Heads: {0} ({1}%).", heads, (heads / (double) numOfTosses) * 100.0);

edit this will work also:
{(heads * 100.0) / numOfTosses},