C#迭代语句、跳转语句--C#基础

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 表达式
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("请输入一串文字：");
            String str = Console.ReadLine();
            foreach (char item in str)
            {
                if (char.IsWhiteSpace(item))
                {
                    Console.WriteLine();
                }else{
                    Console.Write(item);
                      }
                  }
            Console.ReadKey();
        }
    }
}

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace 表达式
 8 {
 9     class Program
10     {
11         static void Main(string[] args)
12         {
13             for (int i = 1; i < 11; i++)
14             {
15                 if (i % 4 == 0)
16                 {
17                     break;
18                 }
19 
20                 Console.Write(i);
21             }
22             Console.ReadLine();
23         }
24     }
25 }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 表达式
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("50以内的奇数：");
            for (int i = 1; i <=50; i++)
            {
                if (i % 2 == 0) {
                    continue;
                }
                Console.Write(i+"\t");
            }
            Console.ReadKey();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 表达式
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                Console.WriteLine("请输入三个整数按回车键确认每个数的输入：");
                int a = int.Parse(Console.ReadLine());
                int b = int.Parse(Console.ReadLine());
                int c = int.Parse(Console.ReadLine());
                Console.WriteLine("平均数为{0}", average(a, b, c));
            }
            Console.ReadLine();

        }
        static double average(int A,int B,int C) {
            return (A + B + C) / 3;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 表达式
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                Console.WriteLine("请输入三个整数按回车键确认每个数的输入：");
                int a = int.Parse(Console.ReadLine());
                int b = int.Parse(Console.ReadLine());
                int c = int.Parse(Console.ReadLine());
                average(a,b,c);
            }
            Console.ReadLine();
        }
        static void average(int A,int B,int C) {
            Console.WriteLine("平均数为{0}", (A+B+C)/3);
            return;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 表达式
{
    class Program
    {
        static void Main(string[] args)
        {
            //5的阶层等于？
            Console.WriteLine("5的阶乘等于？根据以下选项选择正确答案，回车键确认！");
            Console.WriteLine("1. 5!=5\n2. 5!=10\n3. 5!=20\n4. 5!=60");
            //用户的判定
            //标识符标志内容
        error:
            {
                Console.WriteLine("您回答错了！");

            }
            int option=int.Parse(Console.ReadLine());
      
       
            switch(option){
                case 1:
                case 2:
                case 3: goto error;
                case 4: goto right;
                default :
                    Console.WriteLine("选项不存在，请重新选择");
                    //break;
                    goto end;
             }
             right:
             {
                Console.WriteLine("恭喜答对了");
             }
             end: ;
            //end: { }
             Console.ReadLine();
          } 
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 表达式
{
    class Program
    {
        static void Main(string[] args)
        {
            int x = 98;
            char y = ‘a‘;
            x = y;
            y = (char)x;//强制转换
            //字符型‘a‘隐式转换为int型
            Console.WriteLine(x);//输出97
            Console.WriteLine(y);
            Console.ReadLine();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 表达式
{
    class Program
    {
        static void Main(string[] args)
        {
            /*int x = 12222;
            string str = "abcd";
            str = Convert.ToString(x);
            Console.WriteLine(str);*/
            int x = 12222;
            string str = "122222";
            x = Convert.ToInt32(str);
            Console.WriteLine(x);
            Console.Read();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 表达式
{
    class Program
    {
        static void Main(string[] args)
        {
            /*int x = 12222;
            string str = "abcd";
            str = Convert.ToString(x);
            Console.WriteLine(str);*/
            int x = 12222;
            string str = "122222";
            //x = Convert.ToInt32(str);
            str = x.ToString();//值类型转换为字符串类型，可以这样用
            Console.WriteLine(x);
            Console.Read();
        }
    }
}