Microsoft Word - 第3章.doc

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1 Java C++ Pascal C# C# if if if for while do while foreach while do while C# ; 3-1 ischeck Test() While ischeck while

2 static bool ischeck = true; public static void Test() while (ischeck) ; ischeck while statement-list; // statement-list statement-list int firstnum secondnum total int firstnum, secondnum, total; firstnum = 100; secondnum = 10; total = firstnum * secondnum;

3 52 static string name = "Jack"; double money = ; const double radius = 3.14; const int size = 100; // // double // double // C# num=2002 object o = new object() ++num --num num++ num-- count() if if switch if if if if () true false if 3-1

53 3-1 if 3-3 @ 6 Console.Write(""); string username = Console.ReadLine(); Console.Write(" "); string userpass = Console.ReadLine(); if (username.contains("@")) Console.

4 if 6 Console.Write(""); string username = Console.ReadLine(); Console.Write(" "); string userpass = Console.ReadLine(); if (username.contains("@")) Console.WriteLine(" "); if (string.isnullorempty(userpass) userpass.length < 6) Console.WriteLine(" 6 "); Console.ReadLine(); IsNullOrEmpty() Length if if if if if ( )

5 if true 1 2 if if DateTime dt = DateTime.Now; if (dt.hour > 5 && dt.hour < 12) Console.WriteLine(" "); Console.WriteLine(" "); DateTime.Now Hour if if if if if C# if if if

6 if ( 1) 1 if( 2) 2... if ( n) n n+1 55 if if 1 true 1 if if true false n if if 3-5 Console.WriteLine("=============== ================"); Console.WriteLine("1. \n2. \n3. \n4. "); Console.Write(" ");

7 56 int number = Convert.ToInt32(Console.ReadLine()); if (number == 1) Console.WriteLine(""); if (number == 2) Console.WriteLine(" "); if (number == 3) Console.WriteLine(""); if (number == 4) Console.WriteLine(" "); Console.WriteLine(" "); number if if if if if if if if if if if if ( 1)

8 if ( 2) 1 2 if ( 3) if if if if if if if double price = 5000;

9 58 Console.Write(" "); int month = Convert.ToInt32(Console.ReadLine()); Console.WriteLine("=1 =2"); int type = Convert.ToInt32(Console.ReadLine()); if (month >= 3 && month <= 10) // if (type == 1) // Console.WriteLine(" " + price * 0.6); // Console.WriteLine(" " + price * 0.5); // if (type == 1) // Console.WriteLine(" " + price * 0.9); // Console.WriteLine(" " + price * 0.8); price month type if if switch if if if 10 20

10 switch switch switch if switch switch() case 1: 1; break; case 2: 2; break;... case n: n; break; default: n+1; break; 59 switch case case case default n+1 break switch switch C# switch case case case

3-7 switch 60 Console.Write(" 0123 1 23 "); int monthday = Convert.ToInt32(Console.

11 3-7 switch 60 Console.Write(" "); int monthday = Convert.ToInt32(Console.ReadLine()); int month = monthday / 100; int day = month % 100; string xingzuo = ""; switch (month) case 1: xingzuo = day < 21? "" : ""; break; case 2: xingzuo = day < 20? "" : ""; break; /* */ case 12: xingzuo = day < 22? "" : ""; break; Console.WriteLine("" + xingzuo); monthday month day switch case case C# for while do while foreach 4

12 3.3.1 for for for (; ; ) 61 for for 3-8 for int totalsum = 0, oddsum = 0, evensum = 0; for (int num = 1; num <= 100; num++) totalsum += num; if (num % 2 == 0) evensum += num; oddsum += num; Console.WriteLine("1-100 " + totalsum + "\n1-100 " + oddsum + "\n1-100 " + evensum); 3 totalsum oddsum evensum

13 for num=1 num<=100 num 100 num++ num 1 if num if for 3-9 for Console.Write(""); int rows = Convert.ToInt32(Console.ReadLine()); Console.Write(""); int line = Convert.ToInt32(Console.ReadLine()); for (int i = 1; i <= rows; i++) for (int k = i; k <= rows; k++) Console.Write(" "); for (int j = 1; j <= line; j++) Console.Write("*"); Console.WriteLine(); rows line for for for for

14 3.3.2 while for C# while while 63 while ( ) while while while 3-10 while int number = 5; int total = 0; // while (number <= 100) // total += number; // number += 5; Console.WriteLine(" " + total); number total while number 100 total 1050 while for

15 3.3.3 do while 64 do while while while do while do while( ); do while true do while do while while do while while do while while do while do while 3-11 do while string answer = "no"; do Console.WriteLine(" "); Console.WriteLine("1.6:30-7:00 \n2.7:00-7:30 \n3.7:40-8:10 \n4.8:30-17:30 \n5.17:50-18:20 \n :30 \n7.19:30-22:00 \n8.22:00 "); Console.Write(" Yes/No "); answer = Console.ReadLine(); while (answer.tolower() == "no");

16 Console.WriteLine(""); answer while no do foreach foreach for foreach (var item in collection) var item collection foreach foreach for foreach

17 3-12 foreach 66 Console.Write(" "); string inputcontent = Console.ReadLine(); foreach (char inp in inputcontent) Console.WriteLine(inp); C# break goto return continue break break switch while do while if break 3-13 foreach break string[] famous = "", " ", "", "" ; foreach (string fam in famous) if (fam == "") break;

18 Console.Write(fam + " "); famous foreach famous foreach if fam break continue continue continue while do for foreach continue break continue break continue while do for foreach continue continue for continue for 3-13 break continue string[] famous = "", " ", "", "" ; foreach (string fam in famous) if (fam == "")

19 68 continue; Console.Write(fam + " "); return return return return return public static int Fibonacci(int number) if (number == 1 number == 2) return 1; return Fibonacci(number - 1) + Fibonacci(number - 2); static void Main(string[] args) int inputnum = Fibonacci(14); Console.WriteLine(" 14 " + inputnum); Fibonacci() n int if Main() Fibonacci() goto goto

$goto ; goto switch switch case default case default goto goto for try catch finally 69 3-15 Choose: Console.WriteLine(" "); Console.WriteLine("A.\tB.\tC. \t\td. \t\te."); Console.Write(":"); string answer = Console.$

20 goto ; goto switch switch case default case default goto goto for try catch finally Choose: Console.WriteLine(" "); Console.WriteLine("A.\tB.\tC. \t\td. \t\te."); Console.Write(":"); string answer = Console.ReadLine(); if (answer!= "C") Console.WriteLine(""); goto Choose; goto Right; Right: Console.WriteLine(" "); if C goto Choose goto Right Right

21 70 C# static void Main(string[] args) double result = 0; OperNum: Console.WriteLine(" "); Console.Write(""); double num1 = Convert.ToDouble(Console.ReadLine()); Console.Write(""); double num2 = Convert.ToDouble(Console.ReadLine()); Console.Write(" + - * / % "); string oper = Console.ReadLine(); switch (oper) case "+": Console.WriteLine("0 1 2", num2, num2, num1 + num2); break; case "-": Console.WriteLine("0 1 2", num2, num2, num1 - num2); break; case "*": Console.WriteLine("0 1 2", num2, num2, num1 * num2); break; case "/": if (num2 == 0) Console.WriteLine(" 0 "); goto OperNum;

22 Console.WriteLine("0 1 2", num2, num2, num1 / num2); break; case "%": if (num2!= 0) Console.WriteLine("0 1 2", num2, num2, num1 % num2); Console.WriteLine(" 0 "); goto OperNum; break; default: Console.WriteLine(" "); goto OperNum; break; 71 result switch case / % num2 0 0 goto OperNum if switch

23 static void Main(string[] args) for (int gong = 0; gong <= 25; gong++) for (int mu = 0; mu <= 50; mu++) int small = gong - mu; if ((100-4 * gong - 2 * mu) * 2 == small) Console.WriteLine("0 1 2 ", gong, mu, small); for small if C# 2 if 3 4 C# 4 for do while foreach

24 1 while do while A do while while B while do while C while if D do while while 2 73 string day = ""; switch (day) case "": case "": case "": Console.WriteLine(" "); case "": Console.WriteLine(" "); case "": Console.WriteLine(" "); default: Console.WriteLine(" "); Console.ReadLine(); A B C D 3 int count = 0; for (int i = 0; i < 10; i++) if (i % 2 == 0 i % 3 == 0) continue; count += i; Console.WriteLine(count);

25 Console.ReadLine(); 74 A 15 B 13 C 10 D 4 A break continue return goto B goto C continue D return double int string object 5 count if count int count = 100; if (count % 2 == 0) Console.WriteLine(" 2 "); if (count % 5 == 0) Console.WriteLine(" 5 "); if (count % 10 == 0) Console.WriteLine(" 10 "); Console.WriteLine(" "); A 2 B 5 C 10 D

2 if 7 1 1 200 8.5 2 9 3 200 7.5 if 75 3 A 85 4 9*9 3-22 3-22 3.8.1 http://bbs.

26 2 if if 75 3 A * Console.WriteLine(" ");

$Write("*"); Console.WriteLine(); 3.8.2 do while do while http://bbs.itzcn.com/thread-19278-1-1.html int i, j; for (i = 1; i <= 9; i++) j = 1; do Console.Write("\t*"); j++; Console.$

27 76 int row = Convert.ToInt32(Console.ReadLine()); for (int i = 1; i <= row; i++) for (int j = 1; j <= row - i; j++) Console.Write("#"); for (int k = 1; k <= 2 * i - 1; k++) Console.Write("*"); Console.WriteLine(); do while do while int i, j; for (i = 1; i <= 9; i++) j = 1; do Console.Write("\t*"); j++; Console.WriteLine(); while(j<6); Console.WriteLine(); Console.ReadLine(); C# C# do while for while

28 do while do for 77 for /2 1+(1/2) (1+(1/2))/2 double winesurplus = 0; for (int i = 0; i < 3; i++) winesurplus = winesurplus + 1; // winesurplus = winesurplus / 2; // Console.WriteLine(wineSurplus);

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untitled 1 Outline 數料數數列亂數練數數數來數數來數料利料來數 A-Z a-z _ () 不數 0-9 數不數 SCHOOL School school 數讀 school_name schoolname 易不 C# my name 7_eleven B&Q new C# (1) public protected private params override