第0章 基础知识

基础知识

#region 测试
string[] languages = { "Java", "C#", "C++", "Delphi", "VB.net", "VC.net", "C++Builder", "Kylix", "Perl", "Python" };
var query = from item in languages
group item by item.Length into lengthGroups
orderby lengthGroups.Key
select lengthGroups;
foreach (var item in query)
{
Console.WriteLine("strings of length{0}", item.Key);
foreach (var val in item)
{
Console.WriteLine(val);
}
}
Console.ReadKey();
#endregion

int a = 10;
double n2 = 3.0;
Console.WriteLine("占位符{0}", a);
Console.WriteLine("{0:0.00}", a / n2); //3.33
Console.ReadKey();