练习来自腾讯课堂免费课程

腾讯课堂上的课程，链接如下：
IT·互联网游戏开发其他玩游戏 学C#（编程入门）

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1.1.基本输出语句

基本输出语句——知识点总结

• Console 控制台
• WriteLine()
• 在控制台上输出一行信息：
  • 字符串，用英文双引号做区分;
  • 数字不用引号，数字加减做数学运算，而引号内的数字相加得出的是字符串文字;
  • 语句结束需要用英文的分号结束;

Console.Clear();清屏

	Console.Clear();

字符串和数字区分

	Console.WriteLine("英文引号做字符串区分");Console.WriteLine(数字类型不用引号做区分);

Console.ReadLine();

	Console.ReadLine();

• 等待接收用户输入参数，按回车键保存参数，输出，继续运行下一条语句

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1.2.变量的基本使用：

• 示例代码如下：

using System;namespace 1.2.变量的基本使用
{class Program{static void Main(string[] args){int num1;num1 = 10;num1 = num1 + 10;Console.WriteLine(num1);//那么这里输出的是20double num2 = 152.251f;//double值小数点后面带"f"Console.WriteLine(num2);String num3 = "字符串";Console.Clear();Console.WriteLine("num3=" + num1);//这里输出的是 “num3=20”Console.ReadLine();}}
}

变量的基本使用——知识点总结

• 给变量定义名称
• 为变量赋值
• 都是用英文分号 ; 结束
• 下面的代码计算就可以访问变量

            int num1;num1 = 10;num1 = num1 + 10;Console.WriteLine(num1);//那么这里输出的是20

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1.3.格式化输出

• 练习代码如下：

using System;namespace 1.3.格式化输出
{class Program{static void Main(string[] args){string oldName , newName;Console.WriteLine("输入原角色名");oldName = Console.ReadLine();Console.WriteLine("输入新角色名");newName = Console.ReadLine();Console.WriteLine("原角色名:{0}，改完后的新角色名:{1}",oldName ,newName);Console.ReadLine();}}
}

格式化输出——知识点总结

• 给变量取一个名称，为变量赋值，那么如何在字符串中加入变量名，然后可以输出呢？

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1.4.伤害计算

• 练习代码如下：

using System;namespace 1.4.伤害计算
{class Program{static void Main(string[] args){string shp;Console.WriteLine("设定敌人血值：");shp = Console.ReadLine();string satk;Console.WriteLine("设定敌人攻击力值：");satk = Console.ReadLine();int hp;hp = int.Parse(shp);int atk;atk = int.Parse(satk);Console.WriteLine("按回车键对敌人进行一次攻击");Console.ReadLine();hp = hp - atk;Console.WriteLine("玩家对敌人造成了{0}点伤害，敌人当前血量{1}",atk,hp);Console.WriteLine("按回车键对敌人进行一次攻击");Console.ReadLine();hp = hp - atk;Console.WriteLine("玩家对敌人造成了{0}点伤害，敌人当前血量{1}",atk,hp);Console.WriteLine("按回车键对敌人进行一次攻击");Console.ReadLine();hp = hp - atk*2;Console.WriteLine("玩家对敌人造成了{0}点伤害，敌人当前血量{1}",atk*2,hp);Console.ReadLine();}}
}

伤害计算——知识点总结

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1.5.阶段练习：交换两个数

using System;
namespace 1.5.阶段练习：交换两个数
{class Program{static void Main(string[] args){int a = 3;int b = 5;int c;c = a;a = b;b = c;Console.WriteLine("a={0}，b={1}",a,b);Console.ReadLine();}}
}

练习：

• 计算并输出长方形的周长和面积。

练习1:比较两个数大小

using System;
namespace 练习1:比较两个数大小
{class Program{static void Main(string[] args){#region 比较两个数大小int a = 3;int b = 5;if (a>b){Console.WriteLine(">"); }else if (a == b){Console.WriteLine("=="); }else{Console.WriteLine("<"); }#endregion}}
}

练习2:±*/

using System;
namespace 练习2:+-*/
{class Program{static void Main(string[] args){#region +-*/int a = 3;int b = 5;int c = 0;Console.WriteLine("请输入运算符号："); string op = Console.ReadLine();if (op == "+"){c = a + b;}else if (op == "-"){c = a - b;}else if (op == "*"){c = a * b;}else if (op == "/"){c = a / b;}else{Console.WriteLine("input error!");Console.ReadLine();return;}Console.WriteLine("{0}{1}{2}={3}",a,op,b,c); #endregion}}
}

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2.1.If语句嵌套

If语句嵌套——知识点总结

• 用if语句判断条件是否成立
• 关系运算：>,>=,<,<=,!=,==
• 逻辑运算：$$,||,!

判断一个数是正数还是负数

• 如果是正数判断是个位数还是不是个位数
• 如果是负数判断是个位数还是不是个位数

using System;
namespace 2.1.If语句嵌套
{class Program{static void Main(string[] args){int n = int.Parse(Console.ReadLine());if (n>0){if (n<10){Console.WriteLine("1~9"); }else{Console.WriteLine(">+10"); }}else{if (n==0){Console.WriteLine("0"); }else//n>-10{if (n>-10){Console.WriteLine("-1~-9"); }else{Console.WriteLine("<-10"); }}}}}
}

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2.1.If语句嵌套，并列elseif语句

计算BMI

using System;
namespace 计算BMI
{class Program{static void Main(string[] args){#region 计算机MBIfloat height = float.Parse(Console.ReadLine());float weight = float.Parse(Console.ReadLine());float bmi = weight/(height * height);Console.WriteLine("Your BMI is {0}" , bmi);if (bmi < 18.5f){Console.WriteLine("轻");}else if (bmi < 24){Console.WriteLine("正常");}else{Console.WriteLine("异常");if (bmi < 27){Console.WriteLine("过重");}else if (bmi < 30){Console.WriteLine("轻微肥");}else if (bmi < 35){Console.WriteLine("中等肥");}else{Console.WriteLine("中等肥");}}#endregion}}
}

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练习

NPC对话

using System;
namespace NPC对话
{class Program{static void Main(string[] args){#region NPC对话Console.WriteLine("1.猜灯谜");Console.WriteLine("2.打开商店"); Console.WriteLine("3.再见"); string s = Console.ReadLine();if (s == "1"){Console.WriteLine("红公鸡，绿尾巴，身体钻到地底下，又甜又脆营养大。"); Console.WriteLine("1.红萝卜");Console.WriteLine("2.绿萝卜");Console.WriteLine("3.红鲤鱼");Console.WriteLine("4.绿鲤鱼");s = Console.ReadLine();}if (s == "1"){Console.WriteLine("你答对了！");}else if (s == "2"|| s == "3"|| s == "4"){Console.WriteLine("加油！");}#endregion}}
}

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谜语

using System;
namespace NPC对话
{class Program{static void Main(string[] args){#region NPC对话MainMenu:Console.Clear();Console.WriteLine("1.猜灯谜");Console.WriteLine("2.打开商店"); Console.WriteLine("3.再见"); string s = Console.ReadLine();Console.Clear();if (s == "1"){Console.WriteLine("红公鸡，绿尾巴，身体钻到地底下，又甜又脆营养大。"); Console.WriteLine("1.红萝卜");Console.WriteLine("2.绿萝卜");Console.WriteLine("3.红鲤鱼");Console.WriteLine("4.绿鲤鱼");Console.WriteLine("5.我再想想");s = Console.ReadLine();if (s == "1"){Console.WriteLine("你答对了！");}else if (s == "2"|| s == "3"|| s == "4"){Console.WriteLine("加油！");}}else if (s == "2"){Console.WriteLine("1.红色跌打水");Console.WriteLine("2.金光闪闪的肩甲");Console.WriteLine("3.一块萝卜饼");s = Console.ReadLine();if (s == "1"){Console.WriteLine("恢复十点血值");}else if (s == "2"){Console.WriteLine("增加了5点防御力");}else if (s == "3"){Console.WriteLine("增加了5点体力值");}}else if (s == "3"){goto End;}Console.WriteLine("返回上一层");Console.ReadLine();goto MainMenu;#endregion}}
}

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2.4.比较数值大小

using System;
namespace 练习1:比较两个数大小
{class Program{static void Main(string[] args){#region 比较两个数大小int a = 3;int b = 5;if (a>b){Console.WriteLine(">"); }else if (a == b){Console.WriteLine("=="); }else{Console.WriteLine("<"); }#endregion}}
}

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输入三个数最大值

using System;
namespace 2.1
{class Program{static void Main(string[] args){#region 三个数最大者int a = 3;int b = 5;int c = 7;int d = 2;int max = a;if (b > max){max = b;}if (c > max){max = c;}if (d > max){max = d;}Console.WriteLine("max = {0}" , max);#endregion}}
}

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2.5.计算成绩等级

输入三个数，找出最大数。输入成绩，计算成绩等级。

using System;
namespace 2.1
{class Program{static void Main(string[] args){#region 成绩等级int s = 898;string g = "";if (s > 100){g = "";}else if (s >= 90){g = "A";}else if (s >= 80){g = "B";}else if (s >= 70){g = "C";}else if (s >= 60){g = "D";}else if (s >= 0){g = "F";}else{g = "";}Console.WriteLine("Grade is {0}" , g);#endregion}}
}

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2.6.微信猜拳

2.6.1. 猜随机数字

生成一个1-100的随机数字，给用户5次机会猜这个数字，
每次猜完后提示用户比用户输入的数大还是小。

using System;
namespace 2.6
{class Program{static void Main(string[] args){#region 随机猜数字(1~100);Console.WriteLine("请猜数字(1~100) : ");Random rnd;rnd = new Random();int cpu;cpu = rnd.Next(10) + 1;bool ok;ok = false;//1if (ok == false){Console.WriteLine("请猜数字(1~100) : ");int me = int.Parse(Console.ReadLine());if (me == cpu){ok = true;}else if (me < cpu){Console.WriteLine("猜小了");}else{Console.WriteLine("猜大了");}}//2if (ok == false){Console.WriteLine("请猜数字(1~100) : ");int me = int.Parse(Console.ReadLine());if (me == cpu){ok = true;}else if (me < cpu){Console.WriteLine("猜小了");}else{Console.WriteLine("猜大了");}}//3if (ok == false){Console.WriteLine("请猜数字(1~100) : ");int me = int.Parse(Console.ReadLine());if (me == cpu){ok = true;}else if (me < cpu){Console.WriteLine("猜小了");}else{Console.WriteLine("猜大了");}}//4if (ok == false){Console.WriteLine("请猜数字(1~100) : ");int me = int.Parse(Console.ReadLine());if (me == cpu){ok = true;}else if (me < cpu){Console.WriteLine("猜小了");}else{Console.WriteLine("猜大了");}}//5if (ok == false){Console.WriteLine("请猜数字(1~100) : ");int me = int.Parse(Console.ReadLine());if (me == cpu){ok = true;}else if (me < cpu){Console.WriteLine("猜小了");}else{Console.WriteLine("猜大了");}}if (ok == true){Console.WriteLine("恭喜答对了");}else{Console.WriteLine("加油，");}Console.ReadLine();#endregion}}
}

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