C#

  判斷成績：1
 class Program
    {
        static void Main(string[] args)
        {
            string x;
            int y;
            Console.Write("請輸入考試成績：");
            x = Console.ReadLine();
            y = Int32.Parse(x);
            if (y < 60)
            {
                Console.WriteLine("恭喜您，您沒有通過本次考試！您的考試成績爲：{0}分", x);
                Console.ReadLine();
            }
            else
            {
                Console.WriteLine("很遺憾您通過了本次考試,您的成績爲：{0}分", x);
                Console.ReadLine();
            }
        }
    }
}

 

判斷姓名是否：2

namespace aa
{
    class Program
    {
        static void Main(string[] args)
        {
            string name;
            Console.Write(" 請輸入你的用戶名：");
            name = Console.ReadLine();
            if (name == "grant")
            {
                Console.WriteLine("歡迎{0}回來！！！", name);
                Console.ReadKey();
            }
            {
                if (name != "grant")
                    Console.WriteLine("不好意思你不是她，請叫來過來輸入名字，哈哈！！！");
                Console.ReadLine();
            }
       }
    }
}

 

檢查輸入字符是小寫還是大寫或是數字:3
namespace aa
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("請輸入一個字符");
            char a = (char)Console.Read();
            string b;
            if (char.IsUpper(a))//判斷大寫字母
            {
                b = "請輸入你的字符是大寫啊哈哈！！！";
            }
            else if (char.IsLower(a))//判斷小寫字母
            {
                b = " 請輸入你的字符是小寫啊，哈哈！！！";
            }
            else if (char.IsNumber(a))//判斷你的數字
            {
                b = "請輸入你的數字啊，哎不要輸入錯啊！！哈哈！！！";
            }
            else
                b = "你輸入的即不是大寫字符，也不是小寫字母，也不是數字啊！搞好了輸入！！！";
            Console.WriteLine(b);
            Console.ReadKey();
        }  
     }
}       
  

Do…while循環語句:4
namespace grant
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = 1;
            do
            {
                Console.WriteLine(n);
                n++;

            }
            while (n < 100);
            Console.ReadKey();
        }
    }
}

判斷數字對應的星期:5
namespace grant
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("對應表:1=星期一，2=星期二，3=星期三");
            Console.Write("按照上面對應輸入數字：");
            string a;
            int b;
            a = Console.ReadLine();
            b = int.Parse(a);
            string c;
            switch (b)
            {
                case 1:
                    c = "星期一";
                    break;
                case 2:
                    c = "星期二";
                    break;
                case 3:
                    c = "星期三";
                    break;
                default:
                    c = "你輸的什麼東東啊";
                    break;
            }
            Console.WriteLine("請輸入你的字符：{0}，對應的日期：{1}", b, c);
            Console.ReadLine();
        }
     }
}

 

Foreach循環::6
namespace grant
{
    class Program
    {
        static void Main(string[] args)
        {
            char[] x = new char[] { 'g','r','n', 't', 'g', 'r','a', 't'};//定義數組x

            foreach (char y in x)//數組中的值賦予char類型變量y，並按照數組中的次數循環輸出
            {
                Console .WriteLine (x);
            }
       Console.WriteLine ();//輸出
       Console.ReadLine();//定　　　//呵呵！！！
        }
    }
} 
   
   

數組的length屬性:7
namespace grant
{
    class Program
    {
        static void Main(string[] args)
        {
            int[]s={0,1,2,3,4,5,6,7,8};
            int x=s.Length ;
            Console.WriteLine("s數組爲{0}", x);
            Console.ReadLine ();
        }
    }
}