The glorious Years of-c# basic Chapter three flow control 2

Using system;using system.collections.generic;using system.linq;using system.text;namespace P01ReviewAndWhile{class            program {static void Main (string[] args) {//reg ();            Mulloop ();        Console.ReadLine ();                      } #region 9.2 Multi-cycle exercise: Register void Reg ()//9.2 Multi-cycle exercise: Register, ask the user to fill in the user name, if the user name is wrong, prompt the user name error, and asked to re-enter the user name;         Require user to fill in user password, if the user password is wrong, prompt user password error, and require re-enter user password;//Error condition: 1. Cannot be empty; 2. User name and password cannot be the same;            static void Reg () {String strName = "";            String strpwd = ""; while (true) {//1. Loop Check user input name cannot be empty do {Console .                    WriteLine ("Please enter user name:");                    StrName = Console.ReadLine (); if (StrName = = "") {Console.WriteLine ("Username cannot be empty, please re-enter!)                        ");                    Console.WriteLine ("**************************");       }         } while (StrName = = "");                    2. Loop Check user input password cannot be empty do {Console.WriteLine ("Please enter user password:");                    Strpwd = Console.ReadLine (); if (strpwd = = "") {Console.WriteLine ("User password cannot be empty, please re-enter!")                        ");                    Console.WriteLine ("**************************");                }} while (strpwd = = ""); 3. Ask the user if you want to continue to register Console.WriteLine ("Registration is successful ~ ~ Do you want to continue to register it?")                (y/n) ");                String striscontinue = Console.ReadLine ();                if (striscontinue! = "Y") {break;            } Console.WriteLine ("**************************"); } Console.WriteLine ("Exit Successful ~~~!        ");        } #endregion #region 9.1 multi-loop exit void Mulloop ()//<summary>///9.1 Multi-cycle exit </summary> static void Mulloop ()        {for (int i = 0, i < 5; i++) {for (int j = 0; J < 3; J + +)                    {Console.Write ("☆");                        if (j = = 1) {i = 4;//if you want to "exit the external cycle", you can only directly meet the external cycle cycle conditions!                 break;//Note: The break here is to exit the nearest loop (that is, the loop inside)}} Console.WriteLine ("");            Console.WriteLine ("****************************"); }} #endregion #region 9 multi-cycle exercises to hit the specified width of the rectangle///<summary>///9 multi-cycle exercises to hit the finger High width rectangle///</summary> static void Printrec () {Console.WriteLine ("Please enter the height of the rectangle you want to hit:            "); int height = Int.            Parse (Console.ReadLine ());            Console.WriteLine ("Please enter the width of the rectangle you want to play:"); int width = Int.            Parse (Console.ReadLine ()); Multiple loops (nested loops)//1. Print lines (print height rows according to height entered by user) For (int row = 0; row < height; row++) {//2. Prints the stars in each line (the width of a star is printed according to the width of the user input)                for (int low = 0, low < width; low++) {Console.Write ("☆");            //1.1 Prints a newline console.write ("\ n") for each line of stars printed out;        }} #endregion #region exercises require a line on the console screen ************************//<summary>            Exercises require a line to be typed on the console screen ************************//</summary> static void Printstar () {            1. First accept the number of stars to be hit by the user Console.WriteLine ("Please enter the number of stars you want to hit:"); int num = Int.            Parse (Console.ReadLine ());            2. Number of cycles required, 1 * for Each loop (int i = 0; i < num; i++) {Console.Write ("*"); }} #endregion #region 8.0 while loop void while ()///<summary>//8.0 WHI Le cycle///</summary> StatIC void while () {///Identity bit: Identifies whether the user is logged on successfully ~ ~ BOOL IsOk = false; 1.            The while loop is first judged and executed only when the condition is met!                                 while (true), the reason that the loop body code//while (!isok) is reversed is that the loop body is executed only if the Isok=false representative is not logged in; But the while (false) does not execute the loop body, so a while (!false) is required, which is equivalent to while (true) before the loop body code is executed while (!isok)//If the user is not logged into            Execute the Loop body code!                {Console.WriteLine ("Please enter user name:");                String strName = Console.ReadLine ();                Console.WriteLine ("Please enter your password:");                String strpwd = Console.ReadLine ();                    if (StrName = = "Admin" && strpwd = = "123") {Console.WriteLine ("Login Success ~ ~ ~ ~ ~ ~");                IsOk = true; }}} #endregion #region 7.0 Do While loop///<summary>//7.0 do WHI Le Loop///</summary> static void DoWhile () {int i =0;            Features of the 1.0 do While loop: no matter what the conditions are, do it first! Do {//1.1 to 5th, take a break if (i = = 4) {Consol                    E.writeline ("Rest ~ ~ ~ ~ ~ ~ ~");                    i++;                Continue }//1.2 do 19th, do not go, stop the loop if (i = =) {Console.writel                    INE ("Can't Do it anymore ~ ~ ~ ~ ~ ~");                Break                } Console.WriteLine ("Do the first" {0} "sit-ups ~ ~ ~", i + 1);            i++;  } while (I <),//while must be a bool or bool conditional expression and, if true, continue the loop, or, if False, exit the loop//for (int a = 0; A < 20;            a++)//{//Console.WriteLine ("Do the first" {0} "sit-ups ~ ~ ~", a + 1);        }} #endregion #region 6.0 for loop void Forloop ()///<summary>//6.0 cycles    </summary> static void Forloop () {/* 6.1for loop: Specifies the number of times to loop         * Execution Order: * A. First execution, create variable int times = 0 * b. Judging condition times <= 5 if condition is met (TRUE) *             B1. Execution method Body Code * b2. Execution condition Value change times++ * C. Repeat B, knowing that the condition is not satisfied (false), exit the loop */for (int times = 0; times <= 5; times++) {//console.writeline ("teacher, I ran a            Circle ~ ~ ~ "); }//6.1.1 break jumps out of the loop//for (int i = 0; i <; i++)//{//Console.wri            Teline ("I ate {0} buns", i + 1); if (i = = 4)//{//Console.WriteLine ("Ate 5 buns, the 6th one really can't eat ~~~!            ");  break;//exits this layer loop, and when the code runs to break, it automatically exits the loop closest to break//}//}//6.1.2 continue jumps out                    This cycle for (int i = 0; i <; i++) {if (i = = 4) { Console.WriteLine ("Test ~ 5th steamed bun has half a worm ~~~! Throw It away!                    "); continue;//exit this cycle, after continue codeThe face of the non-execution, directly into the next cycle, (jump directly to the i++ go!)            } Console.WriteLine ("I ate {0} buns", i + 1); }} #endregion #region 6.1 topic: Require user input age (0-100)//<summary>//topic: Require user input age (0- 100), if the condition is not met, then ask for re-entry (a total of 3 re-entry opportunities, if not successful, then quit the program!) If successful, displays the user's age//</summary> static void Loopforex () {/* and then look back at "loops": repeating when certain conditions are met Do the same thing * *//1. Use for Loop 3 times for (int i = 0; i < 3; i++) {C Onsole.                WriteLine ("Please enter your Age:"); int age = Int.                Parse (Console.ReadLine ()); if (Ages > 0 && Age <=) {Console.WriteLine ("You are the normal value ~ ~ ~ should be the earth person ~~!                    : 0 "); i = 2;//here because we have received the age of the eligible, so there is no need to recycle;//We will change the loop condition I to 2, then execute the i++ in the For loop and then determine if I <3, because i=i+1 =3, so the condition is not met, and finally exits the loop directly} else {Console.wriTeline ("Your age is a bit strange ~ ~ ~ Normal person is 0-100, please come back again ~ ~ ~"); }}} #endregion #region 6.2 Cycle Title: Login Exercise +void Login ()//<summary>//    /6.2 Cycle Title: Login Exercises//</summary> static void login () {/*6.2 cycle title: Login Exercise * A. Receive the user name and password, if the user name and password equals admin and 123, prompt login success, otherwise always prompt login failed * b. After the login is successful, the user is required to enter the deposit amount in their bank. * C. Requirements             User input age, if the age of 0-20, to users bonus: Deposit amount * 0.2 * between 21-30, issued to the user bonus: Deposit amount * 0.4 * Between 31-100, send user bonus: Deposit amount * 0.6 * Note: Age must be between 0-100 and the whole            Number */String strName = "";            String strpwd = ""; 1. Receive user name and password//for (;;)                Note: for (), the number cannot be omitted, others can be omitted while (true) {Console.WriteLine ("Please enter your user name:");                StrName = Console.ReadLine ();      Console.WriteLine ("Please enter your password:");          Strpwd = Console.ReadLine ();                    if (StrName = = "Admin" && strpwd = = "123") {Console.WriteLine ("Login Successful ~ ~ ~"); break;//Exit Loop} else {Console.WriteLine ("Username or password is incorrect, please reenter ~"                    );                Console.WriteLine ("----------------------------");            }}//2. Enter Age Console.WriteLine ("Please enter your Age:");            int age = Convert.ToInt32 (Console.ReadLine ());            3. Enter your existing deposit amount Console.WriteLine ("Please enter your deposit amount, we will give you the corresponding bonus:"); Decimal money = Decimal.            Parse (Console.ReadLine ());            4. Grant different bonuses according to age decimal Jiangjin = 0m;            if (age > 0 && Age <=) {Jiangjin = money * 0.2M;            } else if (age > && age <=) {Jiangjin = money * 0.4M; } else if (age > && age <=) {Jiangjin = money * 0.6M;        } Console.WriteLine ("Congratulations on your winning the" {0} "Bonus ~ ~ ~", Jiangjin);        } #endregion #region 5.0 ternary operator?: +void Threeyuanope ()///<summary>//5.0 ternary operator?:            </summary> static void Threeyuanope () {Console.WriteLine ("Please enter your dog's age:");            int age = Convert.ToInt32 (Console.ReadLine ());            String hornorname = "";            if (age >) {hornorname = "hero old dog ~ ~";            } else {hornorname = "Puppy dog ~ ~";            } Console.WriteLine ("Dog Honor Name:" + hornorname); /* Ternary operator: *?                            The number must be preceded by a bool expression (an expression that ultimately returns a bool value) * If the bool expression above returns True, then return the value preceding the: number to the previous variable honorName2 * False, then return the value following the: Number * Note: Can be used to replace the simple if else */StrinG HonorName2 = age > All && Age < 22?        "Hero Old Dog": "Puppy Dog"; } #endregion #region 4.0 commonly used string escape characters///<summary>///4.0 commonly used string escape characters///</summ ary> static void Transferchar () {//1. quote transfer character \ \ n line-break transfer character \ t backspace \ \ Backslash Escape (output one \ character) s Tring STRMSG = "\ t small white, i \" Love "you ~!\n you believe \\n?            ~~";        Console.WriteLine (STRMSG);        } #endregion #region 3.0 logical operator void logicoperation ()//<summary>//3.0 logical operators            </summary> static void Logicoperation () {Console.WriteLine ("Please enter your Age:"); int age = Int.            Parse (Console.ReadLine ()); if (age > 0)//{//if (age < +)//{//Console.Write Line ("Your age is normal, congratulations you come to the sinful Earth ~~~!            ");            Console.WriteLine (age);            }//}//1.0 logic and && for connecting two expressions with a bool valueExecution order: From left to right, once an expression is encountered with a bool value of false, then the whole is false, and the subsequent expression is no longer executed//if Age =-1, then age>0=false,&am The expression after the p;& symbol is no longer executed!                      Most importantly: The result of the entire && expression is false//&& The return value of the expression: Returns true only if all judgments in the entire expression are true                 Any one of them evaluates to false, then the entire expression returns False if (age > 0 && Age < 110) { Console.WriteLine ("Your age is normal, congratulations you come to the sinful Earth ~~~!                ");            Console.WriteLine (age); }//2.0 logic or | | : Any judgment is true, the entire expression returns TRUE//only returns False if all judgments in the entire form are false if (age < 1 0 | |            Age >) {Console.WriteLine ("Because you are <10 or >80 years old, so you do not need to buy tickets ~ ~ ~");            }//3.0 Reverse!            bool isOk =!false;            Console.WriteLine ("isok=" + isOk); 3.1 If the and = number is connected, it is called the Not equal! =; Note: no greater than!> < if (age! = 0) {} if (! ( Age >) {} if (!isok)//If isok=false, then!isok = True to enter into the IF statement {            Console.WriteLine ("Haha haha ~ ~ ~");            } if (True) {Console.WriteLine ("123123"); }} #endregion #region 1.0 swap variables//<summary>//1.0 Swap variables///</summa            ry> static void M01swiftvar () {int a = 110;            int b = 120;            1.1 Define intermediate variable int x = a;//The value of one of the variables to be exchanged is stored in x a = B;            b = x;//The value in X, the exchange algorithm of B//1.2 value Type a = a + b;//110 + 120=230 B = a-b;//230-120 =110        A = a-b;//230-110 =120} #endregion #region 2.0 self-increment ...//<summary>            2.0 self-increase self-reduction ...///</summary> static void M02self () {int a = 1;            A = a + 1;   2.1 Self-increment a++ is equivalent to a=a+1 a++;         2.2 Self-reducing a--;//a=a-1;            2.3 The value specified by the self-operation int b = 2;            B + = 220;//equivalent: b = b + 220;            B-= 220;//equivalent to: b = b-220;            b *= 2;//equivalent: b = b * 2;            b/= 2;//equivalent: b = b/2;            b%= 2;//equivalent: b = b% 2;            2.4 About + + and--the front and rear ************** int x = 1;            A. If a pre-or post-operation is used alone, the result is self +1 x + +;            ++x; B. If combined into an operation or assignment statement, there is a distinct difference between the//B1.            "POST": First "operation or assignment", then + + int z = 1;            int z2 = z++;//Note: Here First run = number, then run the + +//equivalent://int z2 = Z;            Z = z + 1;            Console.WriteLine ("z2=" + z2);//1 Console.WriteLine ("z=" + z);//2 int z3 = 2 + z++;            Console.WriteLine ("z3=" + z3);//4 Console.WriteLine ("z=" + z);//2//b2. "Front": Advanced line + + again "operation or assignment"            int o = 1;            int O2 = ++o;//O2 = 1+o;    Console.WriteLine ("o2=" + O2);//2        int O3 = 2 + ++o; Console.WriteLine ("o3=" + O3);//5//b3.            Mix, please be sure to note the priority of the symbol: Pre > operation and Assignment > post int x2 = 1; int O4 = x2++ + 3 + ++x2;  2 + 3 + 2/* Process Order: * 1.  ++X2, x2=2 * 2.  2 + 3 + 2 * 3.  O4 = 7 * 4.        x2++, x2 =3 */Console.WriteLine ("o4=" + O4); } #endregion}}

The glorious Years of-c# basic Chapter three flow control 2