Question List Related To The Topic: "C++"



Last Updated: 25 October, 2021

What is namespace std in c++?


Answer: Namespace is a feature added in C++ and not present in C. Thus there would exist two definitions for the same type in the current namespace. A namespace is designed to overcome this difficulty and is used as additional information to differentiate similar functions, classes, variables etc. std is an.. Know More


What is rvalue in c++?


Answer: An lvalue (locator value) represents an object that occupies some identifiable location in memory (i. lvalue and rvalue in C language. C - lvalue & rvalue Watch More Videos at: https://www. What are lvalue and rvalue in C? TL;DR: “lvalue” either means “expression which can be placed on the left-hand.. Know More


What is cmake in c++?


Answer: CMake is a cross-platform tool that automates the building process of software projects. The CMake Tutorial is now available as the CMake Tutorial Guide in the official documentation. 4 days ago · In our example, the project name is cmake_testapp and the selected language standard in C++14. txt file.. Know More


What is adt in c++?


Answer: Abstract data types (often written ADT for short) are data types whose implementation details are hidden from user view for the data structure, but ADTs can be developed in C using five simple steps. Abstract Data type (ADT) is a type (or class) for objects whose. The ADT is made of with primitive d.. Know More


What is object in c++?


Answer: In C++, Object is a real world entity, for example, chair, car, pen, mobile, laptop etc. A C++ class is like a blueprint for an object. The most common confusing term in c language because generally people understand object just only using in object oriented programming languages. In computer scienc.. Know More


What is tchar in c++?


Answer: TCHAR is simply a macro that expands to char in ANSI builds (i. What if you want your C/C++ code to be independent of character. For Unicode character set: TCHAR stands for wchar (Wide character of 2 byte) For example : If your Visual Studio project setting have character set = Multi byte character .. Know More


What is lvalue in turbo c++?


Answer: In C and C++, LValue must be a container. In C, you must use strcpy() to copy a string. This video shows how we can fix the Lvalue required error in turbo C or any other old compiler. Find Here: Links of All C language Video's Playlists/Video Series C Interview Questions. I get a "Lvalue required" e.. Know More


What is fstream in c++?


Answer: In C++, files are mainly dealt by using three classes fstream, ifstream, ofstream available in fstream headerfile. No, fstream is a C++ class. This data type represents the output file stream and is used to create files and to write information to files. Its direction is in, and its associated sourc.. Know More


What is rvalue and lvalue in c++?


Answer: An lvalue (locator value) represents an object that occupies some identifiable location in memory (i. lvalue and rvalue in C language · L-value: “l-value” refers to memory location which identifies an object. C - lvalue & rvalue Watch More Videos at: https://www. What are lvalue and rvalue in C? TL;.. Know More


What is fpermissive in c++?


Answer: The -fpermissive flag causes the compiler to report some things that are actually errors (but are permitted by some compilers) as warnings, to permit code to compile even if it doesn't conform to the language rules. "--fpermissive" is a compiler switch for g++ and clang++ which turns some compiler e.. Know More


What is oops in c++?


Answer: Object Oriented Programming (OOP) is a programming model where programs are organized around objects and data rather than action and logic. The main aim of OOP is to bind together the data and the functions that. Object oriented programming is a type of programming which uses objects and classes its.. Know More


What is lvalue and rvalue c++?


Answer: An lvalue (locator value) represents an object that occupies some identifiable location in memory (i. lvalue and rvalue in C language · L-value: “l-value” refers to memory location which identifies an object. C - lvalue & rvalue Watch More Videos at: https://www. When first invented, in CPL, “lvalue.. Know More


What is .tlh file in c++?


Answer: Header file generated by a Microsoft C/C++ compiler; contains definitions of interfaces and identifiers generated by the #import directive; used in conjunction with a. Also other errors because it doesn't recognise IMyCSharpInterfactPtr..... Know More


What is wsadata in c++?


Answer: How does WSAStartup function initiates use of the Winsock DLL? c winapi network-programming winsock wsastartup. The following example demonstrates the use of the WSADATA structure and WSAStartup() function. This function requires a pointer to the WSADATA structure..... Know More


What is noexcept in c++?


Answer: noexcept as operator, The noexcept operator checks at compile-time if an expression does not throw an exception. The noexcept operator performs a compile-time check that returns true if an expression is declared to not throw any exceptions. noexcept is an improved version of throw(), which is deprec.. Know More


What is hwnd in c++?


Answer: The window object is an object of the C++ CWnd class (or a derived class) that your program creates directly. HWND is a "handle to a window" and is part of the Win32 API. It may be useful to manipulate a window associated with a console application. In many ways its very much like C++'s 'this' point.. Know More


What is wstring in c++?


Answer: How can I replace the 'wstring' in C? How can I convert my code to standard C? std::wstring is just a wrapper for wchar_t*. The C++ programming language has support for string handling, mostly implemented in its standard library. typedef basic_string wstring; Wide string. std::to_wstring in c++ This.. Know More


What is wchar_t in c++?


Answer: Wide char and library functions in C++ · Just like the type for character constants is char, the type for wide character is wchar_t. A wchar_t is similar to a char in the sense that it is a number, but when displaying a char or wchar_t we don't want to see the number, but the drawn character. typede.. Know More


What is deque in c++?


Answer: double ended queue queue, A double ended queue also called as deque (pronounced as 'deck' or 'dequeue') is a list in which the elements can be inserted or deleted at either end in constant time. Also, you will find working examples of different operations on a deque in C, C++, Java and Python. The f.. Know More


What is lpwstr in c++?


Answer: Common for any C/C++ code that has to deal with non-ASCII only strings. What if you want your C/C++ code to be independent of character encoding/ mode used? Suggestion: Use generic data-types and names to. The LPCWSTR is the (Long Pointer to Constant Wide STRing). Summary · C convert from string to .. Know More


What is npos in c++?


Answer: npos is a constant static member value with the greatest possible value for an element of type size_t. This constant is defined with a value of -1, which because size_t is an unsigned integral type, it is the largest possible representable value for this type. What does string::npos mean in this cod.. Know More


What is sfml c++?


Answer: Simple and Fast Multimedia Library (SFML) is a cross-platform software development library designed to provide a simple application programming interface (API) to various multimedia components in computers. CSFML is the official binding of SFML for the C language. SFML is a simple to use and portabl.. Know More


What is ifdef and endif in c++?


Answer: The directives #ifdef, #else and #endif are logical pre-processor directives which are used to specify which code will be compiled through the compiler based on defined macros. Also, you can't begin a conditional group in one file and finish it in another. This C tutorial explains how to use the #if.. Know More


What is iomanip in c++?


Answer: C++ Library - - iomanip is a library that is used to manipulate the output of C++. Notice that non-parametric manipulators are declared directly in . 5 days ago · iomanip setprecision() function in C++ with Examples. IOMANIP Functions In C++ · Setprecision: This function sets the precision for decim.. Know More


What is hierarchical inheritance in c++?


Answer: Inheritance is the process of inheriting properties of objects of one class by objects of another class. In C++ hierarchical inheritance, several classes are derived from common base. Here, class B is derived from the base class A and the class C is derived from the derived class B. Introduction to .. Know More


What is class in c++?


Answer: A class in C++ is a user-defined type or data structure declared with keyword class that has data and functions as its members whose access is governed by the three access specifiers private, protected or public. Class: A class in C++ is the building block, that leads to. A class is a user-defined d.. Know More


What is using namespace std in c++?


Answer: “using namespace std” means we use the namespace named std. The statement using namespace std is generally considered bad. Using namespaces, we can create two variables or member functions having the same name. The using namespace statement just means that in the scope it is present, make all the th.. Know More


What is qml c++?


Answer: QML is designed to be easily extensible through C++ code. Using Qt's declarative QML language it is simple to define your UI with less code. Application Development with QML is simple and powerful. To call the QML classes in C++, you need to set the objectName property..... Know More


What is hpp file c++?


Answer: Program header (C++), HPP is a file extension for a header file file format used by MarsDigital C++ (previously Zortech C++), Borland C++ and other C++ compilers. HPP files are C++ Header Files or header files that are written in the C++. File extensions communicate the "type" of the file, both to h.. Know More


What is unqualified id in c++?


Answer: A qualified name is one that has some sort of indication of where it belongs, e. Expected unqualified-id · C++ · Forum. What does "expected unqualified-id" mean?..... Know More


What is ofstream in c++?


Answer: basic file operations #include #include using namespace std; int main () { ofstream. In C++, files are mainly dealt by using three classes fstream, ifstream, ofstream available in fstream headerfile..... Know More


What is x value c++?


Answer: Given two numbers A and B. They have no meaning in that programming language. When the vertex is the lowest point, it is called a minimum. A perfect square trinomial is an expression that can be expressed in the form (x + a)^2. Function call by Value in C - The call by value method of passing argume.. Know More


What is mfc in visual c++?


Answer: The Microsoft Foundation Classes (MFC) provide a C++ object-oriented wrapper over Win32 for rapid development of native desktop applications. Microsoft Foundation Class Library (MFC) is a C++ object-oriented library for developing desktop applications for Windows. The Microsoft Foundation Class (MFC.. Know More


What is hpp in c++?


Answer: Program header (C++), HPP is a file extension for a header file file format used by MarsDigital C++ (previously Zortech C++), Borland C++ and other C++ compilers. You're here because you have a file that has a file extension ending in. Here are a couple of reasons for having different naming of C vs.. Know More


What is sdl in c++?


Answer: SDL officially supports Windows, Mac OS X, Linux, iOS, and Android. SDL, the Simple DirectMedia Layer, is the cross-platform game library used in everything from. Simple DirectMedia Layer (SDL) is a cross-platform software development library designed to. C++ can be used for game development, but yo.. Know More


How to initialize vector in c++?


Answer: Below methods can be used to initialize the vector in c++. int arr[] = {1, 3, 5, 6}; vector v(arr, arr + sizeof(arr)/sizeof(arr[0])); vector v; v.push_back(1); v.push_back(2); v.push_back(3); and so on. vector v = {1, 3, 5, 7};.... Know More


What is std in c++?


Answer: In the C++ programming language, the C++ Standard Library is a collection of classes and functions, which are written in the core language and part of the C++ ISO Standard itself. The std namespace is special; it is short for the word "standard. Consider a situation, when we have two persons with th.. Know More


What is vtable in c++?


Answer: A vtable in C can consist of a structure with each data member as a function pointer, or an array of function pointers. Since C doesn't override qux() , its entry in the vtable points to B 's definition (the most specific definition). A virtual method table (VMT), virtual function table, virtual cal.. Know More


How to use qml with c++?


Answer: Integrating QML and C++ Create a new project using the "Qt Quick Application" template in Qt Creator. . Add a new C++ class called BackEnd to the project and replace its header file contents with: . Add the following lines to your project file: . Replace the contents of backend.cpp with:.... Know More


What is inheritance in c++?


Answer: In C++, inheritance is a process in which one object acquires all the properties and behaviors of its parent object automatically. Inheritance is one of the feature of Object Oriented Programming System(OOPs), it allows the child class to acquire the properties (the data members) and. Inheritance is.. Know More


How to use hwnd c++?


Answer: — Describes how to obtain a Console Window Handle (HWND). . Use SetConsoleTitle() to change the current console window title. . c++. Copy. HWND GetConsoleHwnd(void) { #define MY_BUFSIZE 1024 // Buffer size for ..... Know More


Answer: Hear this out loudPauseHWND is a "handle to a window" and is part of the Win32 API . HWNDs are essentially pointers (IntPtr) with values that make them (sort of) point to a window-structure data. In general HWNDs are part an example for applying the ADT model. If you want a Control's HWND see Contro.. Know More


How to become expert in c++?


Answer: What makes you a C programming expert? [closed] Experience in large projects. Mastery of Pointers (and memory management, I'd assume) Mastery of a debugger (gdb, .) Mastery of a profiler (gprof,.) Mastery of a memory profiler (valgrind, .) Knowledge of the fundamental standards..... Know More


How to access vptr in c++?


Answer: — vptr - virtual tables · c++ class polymorphism. there is something i still don't get. for every class i declare there is a ." 8 answers" ·" Top answer: " first, yes, it is the same member. It is automaticaly assigned a first time when running ." Retrieving vptr(pointer to virtual Table aka VTABL.. Know More


Answer: The first entry of the virtual table is the function pointer of the virtual function 'fn'. We can access the first entry using vptr[0] (as this is just an array). So, in line 37, we just call the function using the function pointer..... Know More


What is kbhit function in c++?


Answer: The kbhit is basically the Keyboard Hit. kbhit() is present in conio. Function kbhit in C is used to determine if a key has been pressed or not. kbhit() is a function used to check whether a key is pressed or not. kbhit() is a pre-defined function in conio. run an infinite loop without any condition.. Know More


Why does arduino use c++?


Answer: First, the Arduino compiler/IDE accepts C and C++ as-is. In fact many of the libraries are written in C++. Much of the underlying system is not object oriented, but it could be. Thus, "The arduino language" is C++ or C..... Know More


What is biginteger in c++?


Answer: If you're looking for a simple library, libtommath (from libtomcrypt) is probably what you want. How to compute factorial of 100 using a C/C++ program? Factorial of 100 has 158 digits. The good part is that without any real modifications, I can compile your code with lots of the extra compiler flags.. Know More


How to use iomanip in c++?


Answer: get_time: Get date and time (function ). put_time: Put date and time (function ). Notice that non-parametric manipulators are declared directly in ." Setw · Setfill · Setiosflags · Ios.... Know More


Answer: IOMANIP Functions In C++ Setprecision: This function sets the precision for decimal or float values. setw: Setw function sets the field width or number of characters that are to be displayed before a particular field. Setfill: Setfill function is used to fill the stream with char type c specified as.. Know More


How to unordered_map in c++?


Answer: Methods of unordered_map : at(): This function in C++ unordered_map returns the reference to the value with the element as key k. begin(): Returns an iterator pointing to the first element in the container in the unordered_map container..... Know More


What is dword in c++?


Answer: A dword, which is short for "double word," is a data type definition that is specific to Microsoft Windows. However the meaning has been altered slightly so that a WORD is always 16bit and a DWORD(double word) is 32bit, and I assume 64bit will be. DWORD is not a standard C datatype. A DWORD is a 32-.. Know More


What is wchar in c++?


Answer: h is a header file in the C standard library. Wide char and library functions in C++ · Just like the type for character constants is char, the type for wide character is wchar_t. A wchar_t is similar to a char in the sense that it is a number, but when displaying a char or wchar_t we don't want to s.. Know More


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