高级程序设计C第八章.ppt

2020 1 18 1 高级程序设计 授课教师 祁长兴 C 第八章 常用类 2020 1 18 2 常用类 2020 1 18 3 Math 静态字段PIE静态方法整数运算初等函数三角函数 Abs 求绝对值Ceiling 求大于等于指定数值的最小整数Floor 求小于或等于指定数值的最大整数Round 对数值进行四舍五入 Exp 求e的指数幂Pow 指数函数Log 对数函数Lg10 求以10为底的对数Sqrt 求平方根 Sin 求正弦函数Cos 求余弦函数Tan 求正切函数 2020 1 18 4 staticvoidMain string args doublea 1 2 intk 1 d doubleb c inti b Math Abs a Console WriteLine Abs a 0 b d Math Abs k Console WriteLine Abs k 0 d c Math Ceiling 1 2 Console WriteLine Ceiling 1 2 0 c c Math Floor 1 2 Console WriteLine Floor 1 2 0 c c Math Round 1 5 Console WriteLine Round 1 5 0 c c Math Round 1 2 Console WriteLine Round 1 2 0 c b Math Exp 2 1 Console WriteLine Exp 2 1 0 b b Math Pow 2 3 Console WriteLine Pow 2 3 0 b b Math Log 10 Console WriteLine Log 10 0 b b Math Log10 10 Console WriteLine Log10 10 0 b b Math Sqrt 9 Console WriteLine Sqrt 9 0 b Console ReadLine 2020 1 18 5 Math DemoP8 1 2020 1 18 6 string 构造函数与赋值1 直接赋值 strings1 software 2 构造函数赋值 string char int string char string char int int 2020 1 18 7 staticvoidMain string args strings1 helloworld Console WriteLine s1 0 s1 strings2 newstring a 5 Console WriteLine s2 0 s2 char s3 newchar m i c r o s o f t strings4 newstring s3 strings5 newstring s3 1 4 Console WriteLine s3 0 s3 Console WriteLine s4 0 s4 Console WriteLine s5 0 s5 Console ReadLine 2020 1 18 8 String 获取字符string char 索引函数string char char ToChayArray char ToChayArray intint 起始位置 复制的长度CopyTo int char int int 起始位置 目标数组 指定数组起始位置 复制的长度 2020 1 18 9 staticvoidMain string args strings1 Microsoft char chs1 s1 ToCharArray char chs2 s1 ToCharArray 5 4 Console WriteLine newstring chs1 Console WriteLine newstring chs2 char chs newchar 20 Microsoft CopyTo 0 chs 0 9 Windows2003 CopyTo 0 chs 10 7 Console WriteLine newstring chs Console ReadLine 2020 1 18 10 字符查找 intIndexOf char intIndexOf char int intIndexOf char int int intLastIndexOf char int int intIndexOfAny char staticvoidMain string args strings1 沈阳师范大学软件学院 intpos s1 IndexOf 软 Console WriteLine pos 0 pos Console ReadLine 2020 1 18 11 publicclassSearchCharSample staticvoidMain boolbFail true stringsName char illChars 2020 1 18 12 练习 输入一个字符串 求其中字符 e 出现的次数 2020 1 18 13 usingSystem usingSystem Collections Generic usingSystem Linq usingSystem Text namespaceConsoleApplication1 classProgram staticvoidMain string args strings1 miscrosoftisabigcompanyanditissuperenterprise Istudyfromitandwanttoenter s1 Console ReadLine inti 0 j 0 pos 0 while pos 0 pos s1 IndexOf e j if pos 0 i j pos 1 Console WriteLine i 0 i Console ReadLine 2020 1 18 14 字符串填充与修剪 stringPadLeft int stringPadLeft intchar stringTrim stringTrim char TrimStart TrimEnd 2020 1 18 15 staticvoidMain string args strings1 Microsoft s2 s3 s4 s2 s1 PadLeft 12 s3 s2 PadRight 14 s4 s3 PadLeft 16 s4 s4 PadRight 18 Console WriteLine 0 s4 Console ReadLine 2020 1 18 16 String 获取子串SubString查找子串IndexOf LastIndexOfStartsWith EndWith插入 删除子串Insert Remove替换子串Replace 2020 1 18 17 练习 输入一个字符串 去掉其中子串 err 2020 1 18 18 staticvoidMain string args strings1 Microsoftisareabigcompanyandtheleaderinitisaresuperman s1 Console ReadLine intpos 0 while pos 0 pos s1 IndexOf are if pos 0 s1 s1 Substring 0 pos s1 Substring pos are Length Console WriteLine 0 s1 Console ReadLine 问题是 Microsoftisareabigcompanyandtheleaderinitisaareresuperman 2020 1 18 19 staticvoidMain string args strings1 Microsoftisareabigcompanyandtheleaderinitisaareresuperman s2 s2 intpos 0 while pos 0 pos s1 IndexOf are if pos 0 s2 s2 s1 Substring 0 pos s1 s1 Substring pos are Length s2 s1 Console WriteLine 0 s2 Console ReadLine 2020 1 18 20 staticvoidMain string args strings1 Microsoftisareabigcompanyandtheleaderinitisaareresuperman s2 s2 s1 Replace are Console WriteLine 0 s2 Console ReadLine 2020 1 18 21 Remove Insert 2020 1 18 22 String 格式化字符串Format解析字符串Parse TryParseDemo 2020 1 18 23 StringBuilder 构造函数性能优化Demo 2020 1 18 24 常用数据结构类 DateTime 日期 时间你会如何设计这个类 ArrayList 链表你会如何设计这个类 Demo 2020 1 18 25 String 编写程序 输入一个字符串 求串中包含字符串 am 的个数 2020 1 18 26 staticvoidMain string args strings1 iamamiddleschoolstudentndiamaboy iamateacher intj 0 k 0 i 0 while i 0 i s1 IndexOf am k Console WriteLine i 0 i if i 0 j k i am Length Console WriteLine s1 0 j Console ReadLine 2020 1 18 27 String 判断输入的字符串是否为有效身份证号码 18位 第7位开始 连续8个数字为日期即可 2020 1 18 28 classProgram staticvoidMain string args strings1 Console ReadLine if s1 Length 18 Console WriteLine 无T效 的 身 份 证 号 码 else strings2 s1 Substring 6 8 s2 s1 Substring 6 4 s1 Substring 10 2 s1 Substring 12 2 try DateTimed1 DateTime Parse s2 Console WriteLine 有瓺效 的 身 份 证 号 码 catch Exception Console WriteLine 无T效 的 身 份 证 号 码 finally Console ReadLine 2020 1 18 29 常用类 Windows窗体和控件 2020 1 18 30 Windows窗体和控件 ColorSize PointSizeF PointFDemo 2020 1 18 31 Windows窗体和控件 Form构造函数属性方法事件Demo 2020 1 18 32 Windows窗体和控件 Control属性方法事件 2020 1 18 33 Windows窗体和控件 2020 1 18 34 Windows窗体和控件 模态ShowDialog非模态Show常用事件LoadFormClosingFormClosed 2020 1 18 35 Windows窗体和控件 privatevoidForm1 FormClosing objectsender FormClosingEventArgse MessageBox Show Form1 FormClosing privatevoidForm1 FormClosed objectsender FormClosedEventArgse MessageBox Show Form1 FormClosed privatevoidForm1 Activated objectsender EventArgse MessageBox Show Form1 Activated privatevoidForm1 Deactivate objectsender EventArgse MessageBox Show Form1 Deactivate privatevoidForm1 SizeChanged objectsender EventArgse MessageBox Show Form1 SizeChanged privatevoidForm1 LocationC