[计算机软件及应用]高级程序设计C第八章ppt课件

1、2020/12/24,1,高级程序设计,授课教师：祁长兴,C,第八章：常用类,2020/12/24,2,常用类,2020/12/24,3,Math,静态字段 PI E 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,2020/12/24,4,static voi

2、d Main(string args) double a = -1.2; int k = -1,d; double b,c; int i; 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

3、.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

4、(10)=0, b); b = Math.Sqrt(9); Console.WriteLine(Sqrt(9)=0, b); Console.ReadLine();,2020/12/24,5,Math,DemoP8-1,2020/12/24,6,string,构造函数与赋值 1。直接赋值：string s1=“software” 2。构造函数赋值： string(char, int) string(char) string(char, int, int,2020/12/24,7,static void Main(string args) string s1 = helloworld!; Con

5、sole.WriteLine(s1=0, s1); string s2 = new string(a, 5); Console.WriteLine(s2=0, s2); char s3=new charm,i,c,r,o,s,o,f,t; string s4 = new string(s3); string s5 = new string(s3,1,4); Console.WriteLine(s3=0, s3); Console.WriteLine(s4=0, s4); Console.WriteLine(s5=0, s5); Console.ReadLine();,2020/12/24,8,

6、String,获取字符 string char: 索引函数 string char: char ToChayArray() char ToChayArray(int int)/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,2020/12/24,9,static void Main(string args) string s1 = Microsoft!; char chs1 = s1.ToCharArray(); char chs2 = s1.ToCharArray(5, 4); Console.WriteLine(ne

7、w string(chs1); Console.WriteLine(new string(chs2); char chs = new char20; Microsoft.CopyTo(0,chs,0,9); Windows2003.CopyTo(0, chs, 10, 7); Console.WriteLine(new string(chs); Console.ReadLine();,2020/12/24,10,字符查找,int IndexOf(char) int IndexOf(char,int) int IndexOf(char,int,int) int LastIndexOf(char,

8、int,int) int IndexOfAny(char,static void Main(string args) string s1 = 沈阳师范大学软件学院; int pos = s1.IndexOf(软); Console.WriteLine(pos=0, pos); Console.ReadLine();,2020/12/24,11,public class SearchCharSample static void Main() bool bFail = true; string sName; char illChars = , #, $, %,2020/12/24,12,练习,输入

9、一个字符串，求其中字符e出现的次数,2020/12/24,13,using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 class Program static void Main(string args) / string s1 = miscrosoft is a big company and it is super enterprise.I study from it and want to enter; s1 =

10、 Console.ReadLine(); int i = 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();,2020/12/24,14,字符串填充与修剪,string PadLeft(int) string PadLeft(int char) string Trim() string Trim(char)/TrimStart(), TrimEnd(,2020/12/24,15,stat

11、ic void Main(string args) string s1=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();,2020/12/24,16,String,获取子串 SubString 查找子串 IndexOf / LastIndexOf StartsWith / EndWith 插入/删除子串 Insert / Re

12、move 替换子串 Replace,2020/12/24,17,练习,输入一个字符串，去掉其中子串err,2020/12/24,18,static void Main(string args) / string s1=Microsoft is are a big company and the leader in it is are super man! ; s1= Console.ReadLine(); int pos=0; while (pos = 0) pos = s1.IndexOf(are); if (pos=0) s1 = s1.Substring(0, pos) + s1.Sub

13、string(pos + are.Length); Console.WriteLine(0, s1); Console.ReadLine(); 问题是？ =Microsoft is are a big company and the leader in it is aarere super man!,2020/12/24,19,static void Main(string args) string s1=Microsoft is are a big company and the leader in it is aarere super man! ,s2; s2 = ; int pos=0;

14、 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();,2020/12/24,20,static void Main(string args) string s1=Microsoft is are a big company and the leader in it is aarere super ma

15、n! ,s2; s2 = s1.Replace(are,); Console.WriteLine(0, s2); Console.ReadLine();,2020/12/24,21,Remove() Insert(,2020/12/24,22,String,格式化字符串 Format 解析字符串 Parse / TryParse Demo,2020/12/24,23,StringBuilder,构造函数 性能优化 Demo,2020/12/24,24,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,2020/12

16、/24,25,String,编写程序，输入一个字符串，求串中包含字符串“am”的个数,2020/12/24,26,static void Main(string args) string s1 = iamamiddleschoolstudentndiamaboy!iamateacher; int j=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

17、();,2020/12/24,27,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,2020/12/24,28,class Program static void Main(string args) string s1 = Console.ReadLine(); if (s1.Length != 18) Console.WriteLine(无T效的?身?份证号?码?); else string s2 = s1.Substring(6, 8); s2 = s1.Substring(6, 4) + - + s1.Substring(10, 2) +

18、- + s1.Substring(12, 2); try DateTime d1 = 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();,2020/12/24,29,常用类,Windows窗体和控件,2020/12/24,30,Windows窗体和控件,Color Size / Point SizeF / PointF Demo,2020/12/24,31,Windows窗体和控件

19、,Form 构造函数 属性 方法 事件 Demo,2020/12/24,32,Windows窗体和控件,Control 属性 方法 事件,2020/12/24,33,Windows窗体和控件,2020/12/24,34,Windows窗体和控件,模态 ShowDialog 非模态 Show 常用事件 Load FormClosing FormClosed,2020/12/24,35,Windows窗体和控件,private void Form1_FormClosing(object sender, FormClosingEventArgs e) MessageBox.Show(Form1_FormClosing); private void Form1_FormClosed(object sender, FormClosedEventArgs e) MessageBox