using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication5 class Program static void Main(string args) int x = 80; if (x 90) if (x 80) if (x 90) Console.WriteLine(输出语句一); else Console.WriteLine(输出语句二); else Console.WriteLine(输出语句三); else if (x 16) Console.WriteLine(输出语句四); else Console.WriteLine(输出语句五); else Console.WriteLine(输出语句六); Console.ReadKey();