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using System;
using System.Collections.Generic;
using System.Linq;
class TestGroupBy
{
public static int Main ()
{
int[] int_array = new int [] { 0, 1, 2, 3, 4 };
IEnumerable<IGrouping<int, int>> e;
// group by i % 2 from 1
e = from int i in int_array group 1 by i % 2;
List<IGrouping<int, int>> output = e.ToList ();
if (output.Count != 2)
return 1;
foreach (IGrouping<int, int> ig in e) {
Console.WriteLine (ig.Key);
foreach (int value in ig) {
Console.WriteLine ("\t" + value);
if (value != 1)
return 2;
}
}
// group by i % 2 from i
e = from int i in int_array group i by i % 2;
output = e.ToList ();
if (output.Count != 2)
return 1;
int[] results_a = new int[] { 0, 2, 4, 1, 3 };
int pos = 0;
foreach (IGrouping<int, int> ig in e) {
Console.WriteLine (ig.Key);
foreach (int value in ig) {
Console.WriteLine ("\t" + value);
if (value != results_a [pos++])
return 3;
}
}
Console.WriteLine ("OK");
return 0;
}
}
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