treehouse c# review

. If the Fgets function succeeds, the return value is the address of the first element of the STR array, and NULL is returned if there is an error at the beginning of the end of the file or read data.int puts (char* str, file* FP);Outputs the string pointed to by STR to the file that the FP points to. The string at the end of the ' + ' does not output. If the output succeeds, the function value is 0, and if it fails, the function value is EOF. Read and write a set of data to a file in a

base class name with a scope character that describes the member to invoke the base class at. A base-class version member that is hidden in a derived class exists, is only hidden, and cannot be called through a derived class object.Therefore, the underlying cause of the hidden (different scope) rule is actually the C + + name resolution process (that is, the first member of the name is found in the derived class domain, and if it is stopped, it will

its specified element.9, Mulitmap and mulitset elements of the same key, stored in the adjacent location, the traversal can be guaranteed to return the same key elements. So count (key) returns the number of elements of the key, and find (key) returns the first function of the key.Here is a simple example of applying a map container: Reading a file, recording the number of occurrences of each word in the file, and outputting the occurrences of the word and the number of occurrences in dictionar

any string, and that the subsequence does not require consecutive characters, but that the order is consistent with the main string.Some differences between 8.strcpy and memcpy:1) Different content is copied, strcpy can only copy the string, memcpy can copy any content. strcpy is used only for string copying, and it copies the Terminator of the string, not only the contents of the string. The memcpy has no limitations on what needs to be replicated and is therefore more widely used.2) The metho

Read again primer on the one hand is to check leaks, on the other hand is more in-depth understanding of the essence of C + + ideas. The details and understanding of each knowledge recorded in this review are recorded so as to facilitate subsequent warming.First: Quick Start1. For statement: for (initialize statement; Conditional test statement; conditional modification expression) {statement Body}. Executi

Reference review#include using namespace Std;void Show1 (){cout }void Show2 (){cout }void Show3 (){cout }int main (){int one = 1;int r1 (one); Lvalue reference, referenced memory entityint r2 (one+1);//rvalue reference, value in reference registerint r3 (Move (one));//move can refer to Lvalue as Rvaluecout int: 1;int* p (two);int* (AMP;RP) (p);//reference form of a first-level pointerint** pp (p);Int (* * (AMP;RPP)) (PP); The reference form of the sec

ContentsTen Chararray[]="Hello Word"; One Acout//Print string array contents - intmm[6]={0,1,2,3,4,5}; -cout//Print integer array address the - CharC='a', nn[]={'a','b','C','D','e','F'}; -cout"nn is:"//Print character array contents, but not initialized after N[4], garbled - Char*p1=New Char[Strlen (NN) +1]; +cout"strlen:"//strlen is only useful for string arrays!! How did 12 get here? - strcpy (P1,NN); +cout//as with the print NN,

members of the class. The const plays a protective role mainly.Note: A non-const object can call a const member function, or it can call a non-const member function, but a const object may only call the const member function. Also, non-const objects first call non-const member functions.Finally, remember that the constructor cannot be const. If you are const, how do I complete the initialization work?! 3. The const member function and non-const member functions can form overloads.To this end, t

Review C language-File Operations # Include # Include Int main () {char buf [64] = "hello word! "; // Open the FILE to read the FILE information. Output/* FILE * fp = fopen ("./file1 "," r "); if (! Fp) {perror ("An error occurred while opening the file! "); Exit (-1);} // char buf [64] = {''}; size_t num = fread (buf, fp ); printf ("% d % s \ n", num, buf); fclose (fp); * // Write FILE Infor

#include #define N 10struct student{int num;Char name[30];int score[3];int Ave;}Input (struct student s[]){int i;for (i=0;i{scanf ("%d%s%d%d%d", s[i].num,s[i].name,s[i].score[1],s[i].score[2],s[i].score[3]);}}Float average (struct student s[]){int i,sum=0;float ave1=0.00;for (i=0;i{SUM+=S[I].SCORE[1] + s[i].score[2] + s[i].score[3];}ave1 = sum/(3.00*n);return ave1;}int max (struct student s[]){int i,j,k,m,sum,sum1;for (i=0;i{SUM=S[I].SCORE[1] + s[i].score[2] + s[i].score[3];M=sum;for (j=1;j{sum1

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Linq;4 usingSystem.Text;5 6 namespaceBubble Sort7 {8 9 define a set of variables in another classTen classStudent One { A Public stringCode; - Public stringName; - Public decimalscore; the } -}1 usingSystem;2 usingSystem.Collections;3 usingSystem.Collections.Generic;4 usingSystem.Linq;5 usingSystem.Text;6 7 namespaceBubble Sort8 {9 class ProgramTen { One A Static voidMain (string

Can you call virtual functions in a constructor to achieve polymorphism? 1) When is the Vptr pointer in the object initialized?The vptr pointer is initialized by the compiler when the object is created.Only when the object's construction is completely finished will the VPTR's point be finalized.Parent-Class object Vptr point to parent virtual function tableThe vptr of the subclass object points to the subclass virtual function table Class parent{public:parent (int a=0)//The print function of the

. Fortunately, a database request simply executes a simple stored procedure that returns only a few rows from a table with a few simple records. Try out some different polltime values for your application to find an ideal value to balance database access and data obsolescence. The minimum allowable polltime value is 500. ]connectionStringName is the database connection name that is configured in the Providername= "System.Data.SqlClient"/>Finally, the duration in the OutputCache directive is "999

Properties can be defined in structures, classes, and interfaces;Private int A; Public int a{getreturn A; Setthis. a=value;}A property can be static, but its encapsulated fields must also be static, and the This keyword cannot be used in static properties;Read-only properties and write-only properties are only get or set;To declare a property in an interface:int x{get; Set;}Use the display interface to implement the same method of accessing the property when the method is used in the interfac

, symbolic constants.Definition:const int PI = 3.14;Note: Constants must be assigned when they are defined.Value: Use the constant value directly.Third, Operator:Arithmetic, relationship, logic, other(i) arithmetic--7+-*/%++--Integer, in addition to integers or integers.(ii) Relationship--6= = = > >= (c) Logic--3 | | ! (iv) Other1. composite Operator:+ = = *=/=%=2. Assignment: =3. conditional operator: expression 1? An expression 2: An expression 3Iv

Luck2. Talk about Dependency InjectionAll right, I admit I don't understand, the interviewer said jump right in.Please read: http://www.cnblogs.com/xingyukun/archive/2007/10/20/931331.html3. Unit Testingis not feeling very familiar, just don't know how to describe, the pain is extremelyPerhaps these two articles can help us:Http://www.cnblogs.com/hwh_/archive/2011/02/16/1956006.htmlHttp://www.cnblogs.com/Chinasf/archive/2008/03/07/1094334.htmlThree today, there is not a lot of personal opinion,

One, create a new empty siteSecond, create a new Default.aspx page on this websiteThree, add a GridView controlFour, create a new database, this database contains the table data you want to display, this table must contain the primary key (the table's primary key influence add and delete functions)Five, configuring the GridView Control key1, configuring the data source2, adding a data source3. Select the file path where your database is located, test the connection4,5, select Advanced, add the f

only a single responsibility and encapsulate that responsibility in a class in its entirety. If a class is encapsulated with too many responsibilities, these responsibilities interfere with each other as they execute concurrently. Open closure principle: The extension of the application in the development of open, the modification of the code is closed. Dependency reversal principle: The high-level module should not be directly dependent on the lower module, the correct way should be to

--------------------------"); - - //2. Sorting A + for(inti =0; I 1; i++) the { - for(intj = i +1; J ) $ { theStudent STU1 =(student) list[i]; theStudent STU2 =(student) list[j]; the the if(Stu1.fenshu Stu2.fenshu) - { inObject OB =List[i]; theList[i] =List[j]; theLIST[J] =ob; About } the } the } the + //3. Printing -

calls the parent class's name method in the subclass2. Access modifier:Public: openly, publiclyPrivate: Accessible only within the current class, members of the class if no access modifier defaults to privateprocteced: Protected, can be accessed inside the current class, or in subclasses of the classInternal: Access modifiers that can be used to decorate classes are available in the current project only: internal and publicproctected internal:3. Common key WordsThis: The object of the current c