/// <summary>Initializes a graph from an initialized <see cref="TextInput"/> stream
/// The format is the number of vertices <c>V</c>,
/// followed by the number of edges <c>E</c>,
/// followed by <c>E</c> pairs of vertices, with each entry separated by whitespace.</summary>
/// <param name="input"> in the input stream</param>
/// <exception cref="IndexOutOfRangeException">if the endpoints of any edge are not in prescribed range</exception>
/// <exception cref="ArgumentException">if the number of vertices or edges is negative</exception>
/// <exception cref="FormatException">if the edges in the file are in an invalid input format</exception>
///
public Graph(TextInput input) : this(input.ReadInt())
{
int E = input.ReadInt();
if (E < 0)
{
throw new ArgumentException("Number of edges must be nonnegative");
}
for (int i = 0; i < E; i++)
{
int v = input.ReadInt();
int w = input.ReadInt();
AddEdge(v, w);
}
}
/// <summary>
/// Demo test for the <c>TextInput</c> data type. The test shows
/// the methods' behavior and how to use them.
/// </summary>
/// <param name="args">Place holder for user arguments</param>
public static void MainTest(string[] args)
{
TextInput StdIn = new TextInput();
Console.Write("Type 3 char, 1 integer, a few strings: ");
char[] c = { StdIn.ReadChar(), StdIn.ReadChar(), StdIn.ReadChar() };
int a = StdIn.ReadInt();
string s = StdIn.ReadLine();
Console.WriteLine("3 char: {0}, 1 int: {1}, new line: {2}", new string(c), a, s);
Console.Write("Type a string: ");
s = StdIn.ReadString();
Console.WriteLine("Your string was: " + s);
Console.WriteLine();
Console.Write("Type an int: ");
a = StdIn.ReadInt();
Console.WriteLine("Your int was: " + a);
Console.WriteLine();
Console.Write("Type a bool: ");
bool b = StdIn.ReadBool();
Console.WriteLine("Your bool was: " + b);
Console.WriteLine();
Console.Write("Type a double: ");
double d = StdIn.ReadDouble();
Console.WriteLine("Your double was: " + d);
Console.WriteLine();
Console.WriteLine("Enter a line:");
s = StdIn.ReadLine();
Console.WriteLine("Your line was: " + s);
Console.WriteLine();
Console.Write("Type any thing you like, enter Ctrl-Z to finish: ");
string[] all = StdIn.ReadAllStrings();
Console.WriteLine("Your remaining input was:");
foreach (var str in all)
{
Console.Write(str + " ");
}
Console.WriteLine();
}