treehouse c# review

C language review-pointer linked list and file operations, pointer I was just in my sophomore year, preparing to start learning C ++. I practiced the C language I learned in my freshman year, just in time for the task assigned by the teacher. I wrote a C LanguageSales Manage

1. Common BodyA common body is a special structure that allows different types of data to be stored in the same location. You can define a community with multiple members, but there can be only one member with a value at any time.To define a common body: Union data{ int i; float F; Char str[20];} data;The memory used by the common body should be sufficient to store the largest member of the common body, i.e. data will consume 20 bytes of memory 2. typedef

Review C ++ lambda and pythonlambda from python Lambda is an anonymous function. python lambda can make simple expressions of simple functions. C ++ lambda can implement functions similar to nested functions. Python lambda Lambda [arg1 [, arg2, arg3 .... argN]: expression # def defined function def foo (): return 'Hello world' print (foo () # print (lambda: 'Hell

C + + Smart pointer template class review#include #include using namespace Std;Smart pointers are used to ensure that programs do not have memory and resource leaks and are exceptionally secure.C++98 provided auto_ptr,c++11 abandoned auto_ptr, and proposed unique_ptr, shared_ptr, weak_ptrvoid Show1 (){int* p = new int (4);cout }void Show2 (){int* p = new int (5);

improve efficiency.For input parameters of an internal data type, do not change the "value passing" method to "Const reference pass". Not only does not improve the efficiency, but also reduces the readability of the function.The return value of the function is modified with the const:The contents of the function return value (that is, the pointer) are not ENG modified if the return value of the function returned by the "pointer Pass" method is added to the const modifier. The return value can o

BackgroundFreshman time in the first contact with iOS programming, then the feeling is: Xode really is the weapon of God soldiers! After a lapse of three, today, you can use Xcode to create a "divine Soldier weapon": Invincible Big Hammer, review of iOS programming common problems.Basis The powerful weapon of the Divine Soldier, in the final analysis, is a common weapons. We can abstract the common features of all weapons as the parent of the divine w

, since functions with const or non-const parameters are no different in C.Miscellaniesint *v1; This should be understood from right to left, V1 is a reference, and a int* type binding. You can specify a default argument only once for one parameter. Each version of the overloaded function should be declared in the same scope. function pointers can only be initialized or assigned by a function or function pointer of the same type or by a 0-value constant. A direct referen

1, c error handlingerrno, Perror () and Sterror ()The perror () function displays the string you passed to it, followed by a colon, a space, and a textual representation of the current errno value.The strerror () function returns a pointer to the text representation of the current errno value.Error removed by 0Program Exit statusNormally, a program that successfully executes an operation normally exits with a value of exit_success. Here, Exit_success

C language signed and unsigned: In C language, all operands are automatically convertedUnsigned type Signed int A =-110; unsigned int B = 2; cout For floating point numbers, float (double) is actually a signed number. The unsigned and signed prefixes cannot be added to float and double, of course, there is no conversion problem between the unsigned numbers. The main difference between signe

, for example:int[]=newint[]{98 , A. You can also assign an array variable to another target array variable. In this case, the destination and source point to the same memory location:int []= new int[] { 99,98, 92 , 97, 95}; int[] score = Marks When you create an array, the C # compiler implicitly initializes each of the array elements to a default value based on the array type. For example, all elements of an int array will be initialize

*operator New[] (size_t);3 void*operator Delete(void*);4 void*operator Delete[](void*);5 6 //eg.7 string*ps = static_caststring*> (operator New(sizeof(string)));8 intSZ =Ten;9 int*pi = static_castint*> (operator New(sizeof(int)*sz));Ten operator Delete[] (PI);C. Positioning new (placement new)The position new expression initializes an object in the allocated raw memory. It differs from operator new in that it does not allocate a memory amount object,

1. the constructor for C + + inheritance is from the left side of the base class to the right. such as class A:pulic X, Y.The order of execution isX,y,a construction.A,y,x Destruction2. C + + virtual function mainly implements dynamic binding.Pure virtual functions, however, need to be implemented in the inheriting class. A pure virtual function is an abstract class and cannot be instantiated. If the inhe

C + + class conversion constructors and conversion functions review#include #include using namespace Std;Class Student{PrivateString name;int age;Double grade;PublicStudent (string name_, int age_, double grade_): Name (name_), age (Age_), Grade (Grade_) {}Student () {}Student (double grade_)//conversion constructor{Grade = Grade_;}Student (int age_){age = Age_;}Explicit Student (String name_){name = Name_;

directory should also have a working directory----all the compilation, linking and other work should be done in this directory, tools directory----about file editor, file lookup and other tools can be stored in this directory.(9) Some statements are compiled to generate alarms, but if you think it is correct, you should remove the alarm information by some means. For example, in Borland/C + +, you can use "#pragma warn" to turn off or turn off some a

status_t camera::connectlegacy (int cameraid, int halversion, const string16 Clientpackagename, int Clientuid, spAnalyze where CL and C->mcamera pass to.Android Framework Camera Review-camera cameraclient Icamera Relationship (1) where-cl and C->mcamera go

{return_passenger;} Set{_passenger =value;} } PublicCar (stringBrandstringColorintpassenger):Base(brand, color) { This. Passenger =passenger; } Public Override voidSayHello () {Console.WriteLine ("I am the { 0} card {1} color sedan, the number of passengers is {2} people", This. Brand, This. Color, This. Passenger); } Public voidZaike () {Console.WriteLine ("{0} The car sits comfortably and the guests love to sit", This. Brand); } }. NET Learning notes---

]) { intZhong =Age[i]; Age[i]= age[j+1]; Age[j+1] =Zhong; } } } for(inti =0; I ) {Console.WriteLine (age[i]); } console.readline ();Example2. Two-dimensional arrayint [,] array = new int[4,2];V. Collection set ArrayListInitialization, no data type required, no length definition requiredWhen adding data, it can be of different data types.ArrayList al = new ArrayList ();for (int i = 0; i {Al. ADD (int. Parse (Console.ReadL

() function, which occupies the size of memory in the entire array, in bytes.Eg:sizeof (a)/sizeof (a[0])//divide to get the number of cells in the array.sizeof (a[0])//Find out the size of a single element in the array, in bytes5. Access to the elements in the array is done by iterating through the index to get all the elements that we canCan not: int a[] ={1,2,3}; int b[] = A; This is a wrong way of writing.The variables in the array are not assignable in this province, and to be assigned to a

Programming with pthread? What is pthread? Pthread, as the standard thread library for C/C ++ programming, is actually POSIX standard thread library. So how to understand the POSIX standard? Below are links to some materials. If you are interested, you can view them by yourself. 1. http://zh.wikipedia.org/wiki/POSIX 2. standards.ieee.org/findstds/standard/1003.1-2008.html 3. www.opengroup.org

Preparations before the interview --- C # knowledge Review ---- 05, The technical blog has to be written, the work is still being screened, and the study has to continue. 1. Differences between Session and Cookie usage The answer is that the Session is on the server, and the stored data can be large. For example, we store a Table with thousands of data records. Cookies are stored on the client, with low sec