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C++ This declaration does not contain a storage class or type specification

C
Cleofas last edited by
```
struct st1 {
    string name[2];
    bool active[2];
};
struct st2;
void init() {
    struct st2 {
        st1 tier1;
        st1 tier2;
        tier1";
    }
};
```
I created a structure. st1 and tried to use it twice in the structure. st2♪ As far as I'm concerned, it's what you need to add, but Visual studio 2019 shows a mistake. это объявление не содержит класс хранения или спецификатор типа on line tier1; (if you write, for example, tier1.name[0]="Имя"; or replace all the masses by a few variables, nothing is changed.
So I tried to initialize the structure. st2 Outside, but the result was still the same.
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N
nishika last edited by
You have a structure. st2 field present st2 It probably makes mistakes. If I understand you correctly, it's a function. init() I was added to the unsatisfactory, so I took it away. As a result, when writing the structure:
```
#include <string>
struct st1 {

std::string name[2];

bool active[2];

};

struct st2 {

st1 tier1;

st1 tier2;

};
int main()

{

st2 c;

c.tier1.name[0] = "5";

}
```
No mistakes arise and a copy of the structure that we can edit is being produced calmly, and I have changed for example. name[0] Ooh. tier1That's what happened after the code was completed:
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Transition from C# to C++ and C
Software Programming • c sharp c++ c language • • Oba22

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If you do know anything, you can take a book like "C+ in depth" and sort it out. So much to remember. We can study STL and some Boost libraries. If there's something incomprehensible going on, go to the basic books. Some sections that have been forgotten or missed in their time, teach them the whole thing.And in parallel, write a project, small, on C++. Try to apply new knowledge.
C

Class array, launch error
Software Programming • c++ • • Cleofas

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Standard C+ (9.2 Class members)9 Non-static (9.4) data members shall not have incomplete types.This declaration of data member arrint arr[]; is incomplete because the size of the mass is unknown. In addition, the declaration of the mass cannot contain a zero size. The very definition of your class is therefore incorrect.You should either dynamically create a mass on your own, depending on the size of it, or use the class already available. std::vector<int>♪If you need to work on the dynamic distribution of the masses for training purposes, the class advertisement may look as follows (I did not include a displacement designer and a relocation operator)#include <iostream> #include <algorithm> #include <utility> #include <cstdlib> #include <ctime> class Demo { private: size_t size = 0; int *arr = nullptr; public: typedef size_t size_type; typedef int value_type; Demo() = default; Demo( size_t i ) : size( i ), arr( i == 0 ? nullptr : new int[i] ) { if ( arr ) { std::generate( arr, arr + size, [] { return std::rand() % 10; } ); } } Demo( const Demo &rhs ) : size( rhs.size ), arr( rhs.size == 0 ? nullptr : new int[rhs.size] ) { if ( arr ) { std::copy( rhs.arr, rhs.arr + rhs.size, arr ); } } ~Demo() { delete []arr; } Demo & operator =( const Demo &rhs ) { Demo tmp( rhs ); swap( tmp ); return *this; } void show() const { for ( size_t i = 0; i < size; ++i ) std::cout << arr[i] << ' '; std::cout << std::endl; } void swap( Demo &rhs ) { std::swap( size, rhs.size ); std::swap( arr, rhs.arr ); } size_type get_size() const { return size; } }; void swap( Demo &lhs, Demo &rhs ) { lhs.swap( rhs ); } int main() { std::srand( ( unsigned int )std::time( 0 ) ); Demo a1( 5 ); Demo a2( 10 ); a1.show(); a2.show(); swap( a1, a2 ); a1.show(); a2.show(); } The programme may have the following conclusion:1 8 5 1 2 7 3 1 4 2 9 2 9 9 4 7 3 1 4 2 9 2 9 9 4 1 8 5 1 2 With regard to the movement designer and the transferee operator, they may look as follows:Demo( Demo &&rhs ) : Demo() { swap( rhs ); } Demo & operator =( Demo &&rhs ) { swap( rhs ); return *this; }
D

Fill the mass with elements of the plague
Software Programming • c++ liabilities • • derk

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Let's say we have a function, std::vector<int> GenerateAppropriateArray();which will return the mass (in this case, for convenience use) std::vector<int>() values that will be randomly generated and form a wolf. Assume the initial interval from which the numbers are not selected. Interval values when the function is called a and b♪ Furthermore, we will generate the wave by circumcising the interval so that the values are not less than or more of the previous ones. We'll cut off the left if we don't get to the middle of the wave, and to the right, if we cross the middle. Let's say we have a 1 to 100 interval and a wave consisting of five elements, and five steps to get the right numbers: (1) Choose a random number of 1 to 100, allow 5 - our first element 2. Choose from 5 to 100, received 85 - 2 (3) Choose 85 to 100, received 95 to 3 (4) News are selected from the initial interval, i.e. 0 to 100, 50 to 4 5. Choose from 0 to 50, receive 13 End wave: 5, 85, 95, 50, 13 Maybe the code would be easier to deal with, texted for a quick hand, but as an example for inspiration, I hope #include <vector> #include <iostream> #include <random> int random(int from, int to) { std::random_device rd; std::mt19937 mt(rd()); std::uniform_int_distribution<>urd(from, to); return urd(mt); } std::vector<int> GenerateAppropriateArray() { constexpr int NumberOfElementsInEachWave = 5; std::vector<int> Result; int a; int b; int NumberOfWaves; std::cout << "enter left boundary of interval" << std::endl; std::cin >> a; std::cout << "enter right boundary of interval" << std::endl; std::cin >> b; std::cout << "enter number of waves in array" << std::endl; std::cin >> NumberOfWaves; for (auto i = 0; i < NumberOfWaves; i++) { int RandomNumberFromInterval; int CurrentLeftBound = a; int CurrentRightBound = b; for (int j = 0; j < NumberOfElementsInEachWave; j++) { RandomNumberFromInterval = random(CurrentLeftBound, CurrentRightBound); Result.push_back(RandomNumberFromInterval); if ((NumberOfElementsInEachWave + 1) / (j + 1) > 2) { CurrentLeftBound = RandomNumberFromInterval; CurrentRightBound = b; } else { CurrentLeftBound = a; CurrentRightBound = RandomNumberFromInterval; } } } return Result; } int main() { std::vector<int> Check = GenerateAppropriateArray(); for (auto e : Check) { std::cout << e << " "; } } If there are questions, write a comment. This is the example of my waves:
R

int storage in c
Software Programming • c language • • rielyn

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If fscanf is running, then the file content where you keep the last record is blank or is not being read properly... and the fscanf ends up writing the value 0 in the variable. Because of this, the variable always takes the value 1 after the increment.
O

File removal error
Software Programming • c++ liabilities files • • obi

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Mistake in these lines:rename("Schoolboy.txt", "Schoolboyold.txt"); remove("Schoolboy.txt"); rename("Schoolboycopy.txt", "Schoolboy.txt"); remove("Schoolboy.txt"); First you rename the file. SchoolboyAnd then you try to remove the file with the same name, and then rename it. Schoolboycopy And then you deactivate that file.If I understand you correctly, you need to Schoolboycopy Changed to SchoolboyAnd after the copy, it's gone.Then this is an example:remove("Schoolboy.txt"); rename("Schoolboycopy.txt", "Schoolboy.txt"); First, we take out the old version, and the new copy we're renamed. Schoolboy
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MIME type of programs written in C language (.c or c++) in PHP
Software Programming • php mime • • Jolied

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Try this:For Cif($_FILES['archivo']['type']=='text/x-c') For C++if($_FILES['archivo']['type']=='text/plain') Besides, we have ways to know the MIME of a file:$mime = new finfo; $filemime = $mime->file($tufichero, FILEINFO_MIME); Greetings,
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LoadLibrary returns zeros.
Software Programming • c++ winapi dll • • obi

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Tried a little on the English version of stackoverflow and found the same question. https://stackoverflow.com/questions/8600559/loadlibrary-returning-null ♪ The owner of Rob Kennedy's name solves this problem:LoadLibrary(L"ntdll.dll")
N

How to transform JSON into an array of objects of a specific class, being that class has compound attributes?
Software Programming • java android json gson • • nishika

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From JSON presenting by you and the data structure also presented in the question, if we use a standard approach like this:final Gson gson = new Gson(); final Response response = gson.fromJson(json, Response.class); Or this:final Gson gson = new Gson(); final Type type = new TypeToken<List<Post>>() {}.getType(); final List<Post> posts = gson.fromJson(json, type); response.setMPosts(posts); It won't work.In the first case an error will appear: Expected BEGIN_OBJECT but was BEGIN_ARRAY, why, obviously JSON does not start with an object and a vector; already in the second, all attributes will be null or with its default value, that is why Gson does not support by default the nomenclature policy adopted in these objects.There are a few ways to do this and I'll show you just one.use http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html in attributes with name outside the supported pattern;create a custom deserializer. Here's how it works: https://sites.google.com/site/gson/gson-user-guide#TOC-Writing-a-Deserializer ;use http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/FieldNamingStrategy.html and define the nomenclature strategy used in its attributes, a DE-PARA between the attributes in the java objects and those in JSON;rename the attributes of your objects to reflect some standard approach already supported by Gson. See this link: http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/FieldNamingPolicy.html ;How has not been cited by you which approach is already using to deserialize to the list and Posts, I will show as an example the third approach, creating a strategy of self-nomenclature.I am considering only the attributes shown in the question, if there are others who do not follow the pattern you should consider in its implementation.To have this own strategy we will implement the interface http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/FieldNamingStrategy.html , the implementation of the method http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/FieldNamingStrategy.html#translateName(java.lang.reflect.Field) will be more or less like this:final String fieldName = f.getName(); if (fieldName.equalsIgnoreCase("mAnexos")) { return "anexos"; } final Class<?> declaringClass = f.getDeclaringClass(); final String className = declaringClass.getSimpleName().toLowerCase(); return className + "" + fieldName.toLowerCase(); The attribute mAnexos is the only one who does not share the same pattern of the other attributes, so if it is he we will return Annexes, the name of the attribute in JSON. The others already follow the same pattern, i.e. the name of the class in which they are in separated low box by one of the attribute name.You can implement the portfolio in several ways, an example in Java 8 would be this:final FieldNamingStrategy strategy = (final Field f) -> { final String fieldName = f.getName(); if (fieldName.equalsIgnoreCase("mAnexos")) { return "anexos"; } final Class<?> declaringClass = f.getDeclaringClass(); final String className = declaringClass.getSimpleName().toLowerCase(); return className + "_" + fieldName.toLowerCase(); }; In other versions of Java you can implement this way (with anonymous class):final FieldNamingStrategy strategy = new FieldNamingStrategy() { public String translateName(final Field f) { final String fieldName = f.getName(); if (fieldName.equalsIgnoreCase("mAnexos")) { return "anexos"; } final Class<?> declaringClass = f.getDeclaringClass(); final String className = declaringClass.getSimpleName().toLowerCase(); return className + "_" + fieldName.toLowerCase(); } }; After implementing the nomenclature strategy, we can use it this way:final Gson gson = new GsonBuilder().setFieldNamingStrategy(strategy).create(); final Type type = new TypeToken<List<Post>>() {}.getType(); final List<Post> posts = gson.fromJson(json, type); // substitua "json" pelo o json que você precisa deserializar final Response response = new Response(); response.setMPosts(posts); Can also create another object that implements http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/FieldNamingStrategy.html , it is at your discretion.
G

Comparison std140 for unform-blocks in sheders (OpenGL, GLSL)
Software Programming • c++ opengl game development graph glsl • • guilherme

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The fact is that the computing conserver is subtracted by a vector unit operation of 2 or 4 machine units (i.e. vec2 of 8 Byte vec4 of 16 Byte). To effectively manage the operation, the units must be equated on the borders of such basic vectors:The units of one machine unit are always started either at the beginning or in the middle of a unit of 2 machine units.The two machine units always start either at the beginning or in the middle of a block of 4 machine units.Blocks of 3 or more machine units are always starting at the beginning of a unit of 4 machine units.See that the size of nowhere doesn't go straight, just An unused place may be added to the block to level the following block.:struct s1 { vec2 offset; // 0 +2 vec2 origin; // 2 +2 }; // 4 struct s2 { vec3 offset; // 0 +3 float dd; // 3 +1 vec4 origin; // 4 +4 }; // 8 struct s3 { vec3 offset; // 0 +3 // 3 +1 иначе следующий блок будет не выровнен vec2 origin; // 4 +2 // 6 +2 иначе следующая структура будет не выровнена }; // 8 struct s4 { float offset; // 0 +1 // 1 +3 иначе следующая структура будет не выровнена }; // 4 struct s5 { float offset; // 0 +1 // 1 +1 иначе следующий блок будет не выровнен vec2 origin; // 2 +2 }; // 4 struct s6 { float offset; // 0 +1 // 1 +3 иначе следующий блок будет не выровнен vec4 origin; // 4 +4 }; // 8 struct TextureBasicMapping { glm::vec2 offset; // 0 +2 glm::vec2 origin; // 2 +2 glm::vec2 scale; // 4 +2 // 6 +2 иначе следующий блок будет не выровнен glm::mat4 rotation; // 8 +16 }; // 24
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C and C#
Software Programming • • Kadir

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uint16_tuint32_tuint64_t → ulongHomeThe first u indicates unsigned.The type that came out this time is all the integer without sign.The difference between sh , int and long is whether to express negative integers.Unsigned integers can handle larger values, not expressing negative integers.Reference https://docs.microsoft.com/ja-jp/dotnet/csharp/language-reference/keywords/integral-types-table
Non-recognition of the design of the compiler
Software Programming • c++ • • morde

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We take the standard, and in 5.2.1.2. we read:Each instance of a backslash character (\) immediately followed by a new-line character is deleted, splicing physical source lines to form logical source lines.I mean.Each copy of the symbol of the reverse line (/), followed immediately by the symbol of the new line, shall be removed by decommissioning the physical reference lines to form the logical reference lines.All right, your last line.// |_| |_|\__,_/_/\_\ "excited" with hax = 42;by making her a comment.Hey, look at that. colour That line on the question is the same as the comment!
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Transformation of types in C#
Software Programming • c sharp • • Burma

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Convert. ToInt16 converts to short, not to int. Int requires Convert.ToInt32.float needs a Convert method. ToSingle
C# Referral to class from any class
Software Programming • c sharp legacy • • jeanid

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As was written, you need to use dependency injection. .net provides mechanisms for this: https://www.nuget.org/packages/Microsoft.Extensions.DependencyInjection/ This works briefly as follows:At the beginning of the application, you determine all possible dependence and the way in which they are created:var serviceProvider = new ServiceCollection() .AddSingleton<Server>() .AddSingleton<Chat>() .AddSingleton<Reposetory>() .BuildServiceProvider(); Now, if you need a server class object, you can get it as follows: var server = serviceProvider.GetService < Server>(); And you're gonna have a copy of the server with all the addictions he needs, so if it's repository, then this Repository will be created without your involvement. In the same way, Repository will automatically receive everything he needs for work, other services or configuration. A simple tutorial can be read by reference: https://andrewlock.net/using-dependency-injection-in-a-net-core-console-application/
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Strange and incomprehensible error
Software Programming • c++ • • kalyn

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Virtual challenges during the construction (or designer) are as if the hierarchy of classes ends in the classroom whose designer(s) is now active. The classes are lower in the hierarchy as if they don't exist.In your case, during class design. bar1 all the virtual challenges will work as if the hierarchy of classes ends in class. bar1a class bar2 doesn't exist in hierarchy at all. Virtual function challenge foo() will be a challenge. bar1::foo()♪ Since this function is pure, your code's behavior is not defined.In practice, specific target functions for virtual challenges directly from the designer are clear at the compilation stage. The compiler in such a situation usually optimizes the code: it does not create a virtual challenge, but it creates an ordinary direct challenge to a particular function. In your case, it's a challenge. bar1::foo()♪ Because the bodies of the function bar1::foo() No, there's no liquor, the lens can't blunt this challenge. That is, in this case, undetermined behaviour is erroneous at the blinking stage. If you disguise a little bit of your virtual challenge, i.e. you'll make it not directly from the designer, but through some intermediate function.class bar1 { public: bar1() { baz(); } void baz() { foo(); } virtual void foo() = 0; }; the compiler will probably no longer be able to accomplish this optimization. Such a code may be computed, but will result in a fall in the programme during performance because of an attempt to create a non-existent virtual function.If you, in the original version of the code, provide your pure virtual function with your own body.void bar1::foo() { } the code may even be successfully compiled (and blinked). However, his conduct remains not formally defined.It should be remembered using polymorphys from the designer or the designer: working in this situation will only be a "restricted" polymorphysm, which ends in a class whose designer(s) is active at this point. If you need some polymorph initialization, the simplest solution will be two-phase initialization: First, you allow class designers to work (first phase, non-lymorphine) and then give some additional method on your own. init()which will fulfil the second phase of initialization with full-time polymorphysics.
R

Show accents and characters Unicode in Visual Studio 2019
Software Programming • c++ visual studio • • Rossere

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Based on the https://es.stackoverflow.com/a/59796/154404 from the post I put you in the comments, you could use something like:printf("La mejor calificaci%cn de Elliot es de 8.", 162); To use cout You could first declare the character:char c = 162; cout << "La mejor calificaci"<<c<<"n de Elliot es de 8."; Codes:a: 160 e: 130 í: 161 o: 162 ú: 163 A: 181 E: 144 Í: 214 Or: 224 Ú: 23 ñ: 164 Ñ: 165

C++ This declaration does not contain a storage class or type specification

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