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Change in geometric vector length

jeanid

There is a function setLength to change the vector length (geometric) on the specified parameter No change of direction♪

This is a function.

Vector2f setLength(Vector2f startPos, Vector2f currentPos, double neededLength)
{
    double currentLength = getLength(startPos, currentPos); 
    //getLength - отдельная написанная мною функция, возвращает длину вектора
double factorLength = neededLength / currentLength; 
//factorLength - коэффициент разности нужной длины и текущей

return Vector2f(currentPos.x * factorLength, currentPos.y * factorLength);

}

The function itself shall return the vector ' s end coordinates given length and the same direction

but why the final length of the vector does not correspond to the necessary (more, less). In addition, the direction of the vector itself is changing. It's definitely not a mistake in getLength, it's all as simple as possible.

double getLength(Vector2f firstdot, Vector2f seconddot)

{

return sqrt(pow(firstdot.x - seconddot.y, 2) + pow(firstdot.y - seconddot.y, 2));

}

Thank you.

fbio

Because you don't know what a vector is.

return Vector2f(
  (currentPos.x - startPos.x) * factorLength + startPos.x, 
  (currentPos.y - startPos.y) * factorLength + startPos.y
);

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media print does not change body length
Software Programming • html cs cs3 media queries • • Nykeriab

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Thank you, solved the problem on your own, assigned to the background1 that was on the print.cs file, and it worked. That's the code anyone needs..background1 { background:url(sahara.jpg) no-repeat; display:block; width:100%; height:675px !important; margin:0 auto; float:left; text-align:center; }
Erroneous undefined reference to
Software Programming • c++ g++ • • morde

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As usual, you just don't have definitions functions - virtual double net_price(size_t) const; virtual void debug(); Class Quote♪Since it inherits ABSTRACT class Disk_quoteI conclude that you just forgot to sign these virtual functions. =0 and make class Quote Also abstract: virtual double net_price(size_t) const = 0; virtual void debug() = 0; Really, debug() You still have an abstract in it. Count_disk_quoteSo maybe we should find out. Quote::debug() and make a purely virtual Quote::net_price()♪ Watch your own way.
Transfer std:string as a parameter of the function to the receiver
Software Programming • c++ • • emmalee

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No problem!You have to go. std::map<std::string, SphereObj*>which will display the name of the sphere in its own sphere.Then the magic code will look very simple:map<string, SphereObj*> sphereNameMap; SphereObj* convertStringToSphereObj(string _str) { map<string, SphereObj*>::iterator it = sphereNameMap.find(_str); return it != sphereNameMap.end() ? it->second : NULL; } If the name's wrong, it'll come back. nullptr♪Well, you'll have to register all the names:void RegisterSphere(string name, SphereObj* sphere) { if (sphereNameMap.find(name) != sphereNameMap.end()) throw "this name is already registered"; sphereNameMap[name] = sphere; }
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Introduce a third vector from two different vectors
Software Programming • c++ liabilities • • Jolied

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Please don't be afraid.#include <iostream> #include <ctime> using namespace std; int* SUM(int* arr, int* ARR1, int size2, int* ARR2, int size3, int& new_size) { int new_size1 = (size2 > size3) ? size2 : size3; arr = new int[new_size1]; int cnt = 0; for (int i = 0; i < new_size1; i++) { for (int j = 0; j < new_size1; j++) { if (ARR1[i] == ARR2[j]) { arr[new_size] = ARR1[i]; ++new_size; } } } return arr; } int main() { int new_size = 0; int arr1[] = { 1,2,3,0 }; // массив для объеденения общих данных int arr2[] = { 3,2,1,8,0}; // массив для объеденения общих данных int* dest = nullptr; // сюда будем результат класть dest = SUM(dest, arr1, 4, arr2, 5, new_size); for (size_t i = 0; i < new_size; i++) { cout << dest[i] << endl; } system("pause"); } For the author:That's what you need:#include <iostream> #include <ctime> using namespace std; int* SUM(int* arr, int* ARR1, int size2, int* ARR2, int size3, int& new_size) { int new_size1 = (size2 > size3) ? size2 : size3; arr = new int[new_size1]; int cnt = 0; for (int i = 0; i < new_size1; i++) { for (int j = 0; j < new_size1; j++) { if (ARR1[i] == ARR2[j]) { arr[new_size] = ARR1[i]; ++new_size; } } } return arr; } int* input_array(int* arr, int& size) { cout << "Quantity of elements - "; int quant; cin >> quant; arr = new int[size=quant]; for (int i = 0; i < quant; i++) { cout << "#" << i + 1 << " = "; cin >> arr[i]; } return arr; } int* random_array(int* arr, int& size) { cout << "Quantity of elements - "; int quant; cin >> quant; arr = new int[size=quant]; for (int i = 0; i < quant; ++i) { arr[i] = rand() % 10; cout << "#" << i << " = " << arr[i] << endl; } return arr; } int main() { int new_size = 0, size1, size2; int* arr1 = nullptr; arr1 = input_array(arr1, size1); // массив для объеденения общих данных int* arr2 = nullptr; arr2= random_array(arr2, size2); // массив для объеденения общих данных int* dest = nullptr; // сюда будем результат класть dest = SUM(dest, arr1, size1, arr2, size2, new_size); cout << "---------------------" << endl; cout << "General elements : "; for (size_t i = 0; i < new_size; i++) { cout << dest[i] << " "; } system("pause"); }
A

Reading a String
Software Programming • c++ c language • • Avante

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I don't know if I understood your question right, but maybe it was something like this:#include <iostream> #include <string> using namespace std; int main() { string s = "2123dog"; int n = stoi(s.substr(0, 1), NULL); int n2 = stoi(s.substr(1, n), NULL); int n3 = stoi(s.substr(1 + n, 2 + n), NULL); string resto = s.substr(2 + n); cout << n << " - " << n2 << " - " << n3 << " - " << resto; return 0; } The output is: 2 - 12 - 3 - dog. Note that all three numbers were stored in type variables int. https://ideone.com/oOblT3
E

program crashing when using array of structures
Software Programming • c++ • • elysha

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then the program by wanting to show da crash, I cleaned it and throws the "segment fault" error right in the show callIt's normal for this to happen, seeing what you've done in the function. mostrar I've had a couple of heart attacks. We'll need a little context to understand what you've done wrong.What is a literal?A literal is a representation of a concept: for example a number. Imagine number three. You know exactly what the "three" concept means and it will be the same as you represent it, in any language, in any programming language, in any numerical basis, at any point in the universe and at any time.A verbatim, is the representation of that concept, so in the following code:for (i = 0; i < 3; ++i) x += 3; We have three literals, the first 0 represents the zero concept. The following 3 and 3 They represent concept three, the same literals are interchangeable and indistinguishable each other because they represent the same, you cannot say that a three is different from another three because both are the same concept: both are the Literal of concept three and anywhere in your code or the code of other people will remain exactly the same: we can say literally that any three is exactly the same three.The numerical literal is the easiest to understand and therefore I have chosen it to illustrate the idea of "Literal", but the same concept of "literality" is applicable to other things, such as letters, at the beginning of your code you write this:char band = (char*)'n'; There are so serious flaws in so few characters that I'm surprised the code even compiles:The variable type does not match the type of the initializer, and should match: The variable band It's kind of char, but you assign a type value char*: char band = (char*)'n'; // ^^^^ ^^^^^^^ <--- Tipo del inicializador: 'char*' // \ // \___ Tipo de la variable = 'char' You transform a literal character ('u') in a character pointer: The character 'u' corresponds to the numerical value 117, that you transform it to pointer ( whose value would be, in 32 bits: 0x00000075) so that it will then be implicitly transformed back to character so that it can be saved band.You can't transform a literal character into pointer to character: To start, you cannot get the memory address of a literal, because they are a conceptual idea, not a real element; to end, by converting a literal character into a pointer you will only get an address from a memory zone that you are not managing.Second, the tragedy is chewed: the fiasco with strcmp.As its own name indicates, the function strcmp compares character strings (string cormparison). Remarco: compare character strings. A string of characters (as its name indicates) are attached characters, chained one after another.This function expects to receive two character pointers, each of the pointers should aim at a memory space with annexed characters and end with the null character '\0'. And that's not what you're making it easier for the function, in fact I'm surprised the code even compiles:strcmp(band,(char*)'0') // ^^^^ ^^^^^^^^^^ <--- El literal de caracter '0' tiene valor 48, // \ convertido a puntero es '0x00000030'. // \ // \___ 'band' es de tipo 'char', pero strcmp espera un 'char*' Assuming that actually compiles, to function strcmp You're asking him to compare as if they were two strings of characters whatever exists in the memory he points to. band (which will be 0x00000030, 0x00000031 or 0x00000032) with what exists in the memory to which it points (char*)'0' (which will be 0x00000030). Since such memory addresses do not manage your program, it responds with the bug (crash).Third, proposed solution.Bad news: your code has no solution. We have to redo it:In C++ the character strings are managed for the object std::string, not with prefixed character formations. struct alumno{ std::string nombre; // ¡Bien! int edad; float promedio; }std1[3]; Plus, std::string incorporates the comparison operator ==So you don't need to use the archaic strcmp.It is bad practice to abuse global variables. struct alumno{ char nombre[40]; int edad; float promedio; }std1[3]; // ¡Mal! float mejor; // ¡Mal! char band = (char*)'n'; // ¡Mal! To find the highest value of a collection of values, chain if is the least practical and scalable. Use loops.Follow the https://es.wikipedia.org/wiki/Principio_de_responsabilidad_%C3%BAnica in your functions, the function pedir I should ask for data not to order them and make calculations with them.If we rewrite your code in modern C++, it might look like:#include <iostream> #include <string> #include <algorithm> struct alumno { std::string nombre; int edad; float promedio; }; void pedir(alumno &a) { fflush(stdin); std::cout << "\nnombre : "; std::getline(std::cin, a.nombre); std::cout << "\nedad : "; std::cin >> a.edad; std::cout << "\npromedio : "; std::cin >> a.promedio; } void mostrar(const alumno (&alumnos)[3]) { auto mejor = std::max_element(std::begin(alumnos), std::end(alumnos), [](const alumno &a, const alumno &b) { return a.promedio < b.promedio; }); std::cout << "\nel mejor promedio es del estudiante " << std::distance(alumnos, mejor) << "\nnombre : " << mejor->nombre << "\nedad : " << mejor->edad << "\npromedio : " << mejor->promedio << '\n'; } int main() { alumno std1[3]{}; for (auto &a : std1) pedir(a); mostrar(std1); return 0; }
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Prohibit a copy of the class. C+++ factory
Software Programming • c++ abstract factory • • shizuka

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This is a classic case. Your class. GUI implemented in a way that knows about the implementation of the class Widgetif you want the heirs to have direct access, too. WidgetWe need to separate the private part of the interface and the public. (sighs)It's a very strange decision to allow all heirs to go into implementation. Widgetnormally such classes should be limited and all closely linked to implementation. Widget)// WidgetPrivate.h namespace details { class WidgetPrivate { public: virtual void privateMethod1() = 0; virtual int& accessToPrivateInt() = 0; ... }; } // Widget.h class Widget : protected details::WidgetPrivate { friend class GUI; public: void somePublicMethod(); int getInt(); //... protected: WidgetPrivate& privateInterface(); // <- никто, кроме GUI и наследников не дотянется до этого метода void privateMethod1() override; int& accessToPrivateInt() override; }; // Widget.cpp WidgetPrivate& Widget::privateInterface() { return *this; } Now, those who have to have access to the guts. Widget Use method privateInterfacesuch inclusions and uses are very easy to find grep privateInterface *class GUI { protected: static WidgetPrivate& widgetPrivateInterface(Widget& w) { return w->privateInterface(); } } class GUIDrived : public GUI { void x() { widgetPrivateInterface(*widget).accessToPrivateInt() = 5; } private: Widget * widget; } All the heirs will have access to the private interface.
S

Random Sound List
Software Programming • c++ • • simrah

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Function PlaySound receives as first parameter a LPCTSTRBOOL PlaySound( LPCTSTR pszSound, HMODULE hmod, DWORD fdwSound ); By defining your array as string, you must use the function c_str() to deliver to the function PlaySound a pointer to char.I'll give you an example of what you'd have to do.#include <iostream> using namespace std; void f( const char *wav ) { printf( "%s", wav ); } int main() { string ra[] = {"demon_0.wav","demon_1.wav","jocker.wav"}; f( ra[1].c_str() ); return 0; } In your code, it would be enough to do:PlaySound(ra[random].c_str(),NULL,SND_FILENAME|SND_ASYNC);
How's the cycle to make you irradiate a changed list of stews that's been changed inside the cycle for?
Software Programming • python python 3.x list for • • briley

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I've decided to use the function. copy(), also delete the function enumerate()and search for an index of the list elements within the cycle forterm_list = ['2', '3', '+', '2', '6', '-', '2', '1', '*', '2', '/', '2', '.', '2'] Список чисел и ариф.знаков строки ввода Input_line_numbers = [] print(term_list) Создание списка с конкатенированными числами и ариф.знаками for n in term_list.copy(): i = term_list.index(n) print('Я индекс: ', i, ' - Я число: ', n) if n in ("+", "-", "*", "/"): print('Нашел арифметическое действие: ', n) print('До: ', term_list) print('До: ', Input_line_numbers) # Делаем вырезку в отдельный список от первого знака и # до знака арифметики Input_line_numbers.append(''.join(term_list[0:i])) # Удоляем часть списка от первого знака и до знака арифметики del term_list[0:i] # Вырезаем сам знак арифметики Input_line_numbers.append(''.join(term_list[0])) # Удоляем знак арифметики del term_list[0] print('После: ', term_list) print('После: ', Input_line_numbers) i = 0 Вызераем в отдельный список последнее число Input_line_numbers.append(''.join(term_list[0:])) Удоляем последнее число из списка del term_list[0:] print(Input_line_numbers)
template argument deduction/substitution failed:
Software Programming • c++ boxes with++ • • Alberto

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The thing is,{ std::string( "mask" ), mask } That's it. initializer_listNot pair... That's how it goes:Params params = ToParams( where , make_pair(std::string( "mask" ), mask) ); Because it's gonna be clearly a type.
K

Vector length calculation
Software Programming • c language liabilities • • Kadir

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The function for the length of the vector may look as follows:#include <math.h> //... double vector_length( const double a[], size_t n ) { double sum = 0.0; for ( size_t i = 0; i < n; i++ ) sum += a[i] * a[i]; return sqrt( sum ); }
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Serialization of visions and code they're implementing
Software Programming • c++ qt qt5 • • gionna

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Is that how to be with, for example, what if the view contains a button, and one module has one button to do one and the other to another?I would suggest that we consider:Qt - let us build any possible interfaces.SQL The bases will allow us to keep not only the data in a structured way, but also visual diagrams/departures, but also the logic of scruples. I don't see much point in writing computed flames on C+++ because for UI, the speed criterion is secondaryLua - will allow, in fact, the logic underground dynamicallyMinor overlapping issueЭлемент управленияWe already have their limited number, like QLineEdit, QPushButton, QTableView, etc... Let us list them in the form of a table in the OBD system and assign them unique IDs to make further reference.Группы It's a few management elements that work together. It is not yet a question of visualization, but only that for certain actions the simultaneous existence of these elements is necessary. Moreover, groups should be able to form not only management elements but from other groups. Here and beyond, they'll probably have to give all the properties of the management elements. The difference is only in joint independent or dependent work. Let the groups and their composition register in the database.Роли These are the characteristics of the application of control elements in the group. Which one, we'll figure it out later. In the meantime, we'll record all the base plays. ОграниченияThese are static or dynamically generated validation conditions that may be contained in the control elements. The limitations themselves, in isolation from context, are meaningless - they must be tied to roles/roles. But they also need to be registered in the database.СостоянияThis is a combination of the capacity or inability of control elements to perform the required roles.СигналыThese are events that can generate management elements depending on the role. These events, which are understandable, will be the reaction of neighbouring or higher management elements. Let's register them in the database.ДействияThis is, in fact, a programmed manipulation of both management and application elements. They're bound to signals (which, as the above, are tied to the roles themselves). Let's register them in the database. Minor approximation of the issueThe above list is the basic essence, which is manipulated by which we can dynamically collect the business logic we need under every UI we need. The integrity of the database is registered, unique identifiers have. The hardest thing to do is register in the database unsatisfactory, unnecessarily, that's what's going on.Well, that's the reason. I understand it's the top, but I'm sure it's the right approach. The other question is, is it all necessary?
E

Read a memory address stored in a text file
Software Programming • c++ • • emerson

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K

Update: In the end I just needed to use "std::hex" to read the file, although optionally if for some reason they need to convert a string that stores a hexadecimal value to an entire variable type, they can use "std::stoi" as follows:int entero = std::stoi(texto.c_str(),nullptr,16); With the third parameter we are telling you to convert the integer to base 16 (hexadecimal).
S

Why std:vector.push_back(new struct()) works slower than std:vector.push_back(struct_item)
Software Programming • c++ memory indicators vector • • shizuka

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The memory manager is not the fastest system, so you have the main time losses.new A() More specifically, to remembrance, to update the mass of the service structures of the memory manager, etc., which is longer than the mere replication of 20 bytes. ♪
E

R. In the forming of a data vector from the table, the vector will carry other numbers
Software Programming • no tags • • emran

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(1) Add. stringsAsFactors =FALSE Total read.table to read the text as a text. Usually, default R reads it as a factor.(2) I think the problem might be the same as in the dec=, you've got an exact comma splitter?(3) If anything above doesn't help you try and do as.numeric(data[,2]) or as.numeric(as.character(data[,2])) - if the problem is in number and divider format.

Change in geometric vector length

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