string exp; //expression getline(cin,exp); stack<int> vs; //value stack (postfix evaluation) stack<string> infix; //infix stack (postfix conversion) stack<string> prefix; //prefix stack (postfix conversion) for(int i=0;i<exp.length();i++){ char ch = exp[i]; if(isdigit(ch)){ vs.push(ch – ‘0’); infix.push(string(1,ch)); prefix.push(string(1,ch)); } } Here I have used string(1,ch) inbuilt constructor to convert single character to a String. But I wanna know, is… Read More single character to String conversion

My code has something strange. It doesn’t have any syntax errors, and when I run it, it runs and takes input, and then immediately terminates. What is the issue? I have tried to run the code in VS Code and Codeblocks, and I am faced with the same error. I am stuck right now. #include… Read More Running a C++ code with no syntax error but something strange terminates

struct window_data { window_props win_props; bool VSync; Window::event_callback_fn EventCallback; }; I have this struct in my program. sizeof(window_data) equals 120. #pragma pack(push, 2) struct window_data { window_props win_props; bool VSync; Window::event_callback_fn EventCallback; }; #pragma pack(pop) If i use #pragma pack(push, 2), sizeof(window_data) equals 114. #pragma pack(push, 1) struct window_data { window_props win_props; bool VSync; Window::event_callback_fn… Read More Is there a speed problem when using pragma pack?

I’ve got classes called "Base" and "Derived". struct Base { Base() = default; virtual ~Base() = default; Base(const Base&) = delete; Base& operator=(const Base&) = delete; virtual void DoStuff() = 0; }; The "Base" class needs virtual destructor and it’s understandable. Also I don’t allow copying of this class struct Derived : Base { Derived()… Read More Do I need a virtual destructor for a second interface class?

I want to create a method to add color to console output. I have an idea in my head similar to std::left and std::setw(). I ended up with the code below, and it works exactly how I want it to. I understand how it works, but I would like some clarifications on some things to… Read More Why does this overloaded operator<< work in an unexpected way?

I’m currently learning how to code object oriented and I’ve created 2 classes (Applicant and OfferLetter) and trying to inherit those 2 classes into a third class (Software Engineer). I’ve gotten it structured for the most part however im getting an error code on my compiler that says "No default constructor exists for the class… Read More How can I create a default constructor c++?

I think I’ve changed the console language from ASCII to unicode and now when I run a code that goes like c = ‘A’+1; it spits out emojis. (c being a char character) I once clicked on something, I did not know what it meant but I have no idea how to search for a… Read More Emojis instead of ascii characters in the debug window

I’m trying to pass a reference to an object from my main.cpp to menux.cpp however I’m getting this error: error: conflicting declaration ‘MenuX alpha4’ MenuX(alpha4); main.cpp #include "MenuX.h" Adafruit_AlphaNum4 alpha4 = Adafruit_AlphaNum4(); MenuX(alpha4); MenuX.h #ifndef MENUX_H #define MENUX_H #include "Adafruit_LEDBackpack.h" #include <Adafruit_GFX.h> // Core graphics library class MenuX { public: MenuX(Adafruit_AlphaNum4 *alpha4); void addX(); private:… Read More How to pass a reference to an object to another class

I just learned about What is the meaning of "operator bool() const" , now I’m wondering what is the meaning of the second part of this definition? struct always_false { operator bool() const { return false; } bool operator = (bool b) const { return b; } }; Specifically, what exactly is bool operator =… Read More What does `bool operator = (bool b) const { return b; }` mean in C++?

how to fill a dynamic array with input from the console? Im begginer and can’t understand it. some help will make my day 😐 >Solution : You can realize this in several ways. Have a look on following post may it will help you.. Using scanf() in C++ programs is faster than using cin?