Newest C++ Questions | Wyzant Ask An Expert

06/26/19

Searching an Array for an Exact Match in C++

Ensure the provided code file named MichiganCities.cpp is open. Study the prewritten code to make sure you understand it. Write a loop statement that examines the names of cities stored in the... more

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C++ C Logic Algorithm

06/26/19

Digit-increasing number test?

A number is called digit-increasing if it is equal n + nn + nnn + ... for some digit n between 1 and 9. For example 24 is digit-increasing because it equals 2 + 22 (here n = 2). Actually, a friend... more

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C++

06/25/19

Is it possible to print a variable's type in standard C++?

For example: int a = 12; cout << typeof(a) << endl; Expected output: int

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Answers •1

C++

06/25/19

Difference between `constexpr` and `const`?

What's the difference between `constexpr` and `const`? - When can I use only one of them? - When can I use both and how should I choose one?

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C++

06/22/19

Meaning of 'const' last in a function declaration of a class?

What is the meaning of `const` in declarations like these? The `const` confuses me. class foobar { public: operator int () const; const char* foo() const; };

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C++ C Logic Data Structures

06/21/19

Can we implement a doubly-linked list using a single pointer?

I want to use a structure like: struct node { char[10] tag; struct node *next; }; I want to use the above structure to create a doubly-linked list. Is that possible and if yes, then how I can... more

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Answers •4

C++

06/21/19

std::wstring VS std::string?

I am not able to understand the differences between `std::string` and `std::wstring`. I know `wstring` supports wide characters such as Unicode characters. I have got the following questions: 1.... more

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C++

06/19/19

Fastest way to check if a file exist using standard C++/C++11/C?

I would like to find the fastest way to check if a file exist in standard C++11, C++, or C. I have thousands of files and before doing something on them I need to check if all of them exist. What... more

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C++

06/18/19

Is < faster than <=?

I'm reading a book where the author says that `if( a < 901 )` is faster than `if( a <= 900 )`. Not exactly as in this simple example, but there are slight performance changes on loop... more

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C++

06/16/19

What does int argc, char *argv[] mean?

In many C++ IDE's and compilers, when it generates the main function for you, it looks like this: int main(int argc, char *argv[]) When I code C++ without an IDE, just with a command line... more

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C++

06/16/19

Sleep for milliseconds?

I know the POSIX `sleep(x)` function makes the program sleep for x seconds. Is there a function to make the program sleep for x *milliseconds* in C++?

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C++

06/11/19

How to initialize private static members in C++?

What is the best way to initialize a private, static data member in C++? I tried this in my header file, but it gives me weird linker errors: class foo { private: static int i; ... more

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C++

06/09/19

How to implement the factory method pattern in C++ correctly?

There's this one thing in C++ which has been making me feel uncomfortable for quite a long time, because I honestly don't know how to do it, even though it sounds simple: **How do I implement... more

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C++

06/09/19

What is a segmentation fault?

What is a segmentation fault? Is it different in C and C++? How are segmentation faults and dangling pointers related?

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Answers •1

C++

06/08/19

Do I need to explicitly call the base virtual destructor?

When overriding a class in C++ (with a virtual destructor) I am implementing the destructor again as virtual on the inheriting class, but do I need to call the base destructor? If so I imagine... more

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C++

06/02/19

How would I get access of a variable in a namespace in c++?

For example: namespace space1{ int var; namespace space2{ int var; namespace space3{ int var; } } How would I access the variable from space1... more

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C++

05/31/19

What's the purpose of using braces (i.e. {}) for a single-line if or loop?

I'm reading some lecture notes of my C++ lecturer and he wrote the following: > 1. Use Indentation // OK > 2. Never rely on operator precedence - Always use parentheses // OK > 3.... more

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C++

05/31/19

How do you get assembler output from C/C++ source in gcc?

How does one do this? If I want to analyze how something is getting compiled, how would I get the emitted assembly code?

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Answers •1

C++

05/30/19

C++ code file extension? .cc vs .cpp?

I have seen C++ code saved as both `.cc` and `.cpp` files. Is there a difference between the two? I am mainly concerned with programs on Linux systems.

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C++ Java C Design Patterns

05/29/19

Is there a Java equivalent or methodology for the typedef keyword in C++?

Coming from a C and C++ background, I found judicious use of **`typedef`** to be incredibly helpful. Do you know of a way to achieve similar functionality in Java, whether that be a Java... more

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C++ Java C D

05/29/19

Is D a credible alternative to Java and C++?

Is the [D language](http://www.digitalmars.com/d/) a credible alternative to Java and C++? What will it take to become a credible alternative? Should I bother learning it? Does it deserve... more

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C++ Computer Programming Theory Language Design

05/28/19

Why are C++ inline functions in the header?

<sub>NB This is not a question about how to use inline functions or how they work, more why they are done the way they are.</sub>The declaration of a class member function does not need... more

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C++

05/28/19

What are inline functions? What is the syntax for defining an inline function?

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C++ Computer Programming Theory Types

05/28/19

What is a scalar Object in C++?

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Answers •2

C++ Linux G++

05/24/19

usr/bin/ld: cannot find -l<nameOfTheLibrary>?

I'm trying to compile my program and it returns this error : usr/bin/ld: cannot find -l<nameOfTheLibrary> in my makefile I use the command `g++` and link to my library which is a symbolic... more

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Searching an Array for an Exact Match in C++

Digit-increasing number test?

Is it possible to print a variable's type in standard C++?

Difference between `constexpr` and `const`?

Meaning of 'const' last in a function declaration of a class?

Can we implement a doubly-linked list using a single pointer?

std::wstring VS std::string?

Fastest way to check if a file exist using standard C++/C++11/C?

Is < faster than <=?

What does int argc, char *argv[] mean?

Sleep for milliseconds?

How to initialize private static members in C++?

How to implement the factory method pattern in C++ correctly?

What is a segmentation fault?

Do I need to explicitly call the base virtual destructor?

How would I get access of a variable in a namespace in c++?

What's the purpose of using braces (i.e. {}) for a single-line if or loop?

How do you get assembler output from C/C++ source in gcc?

C++ code file extension? .cc vs .cpp?

Is there a Java equivalent or methodology for the typedef keyword in C++?

Is D a credible alternative to Java and C++?

Why are C++ inline functions in the header?

What are inline functions? What is the syntax for defining an inline function?

What is a scalar Object in C++?

usr/bin/ld: cannot find -l<nameOfTheLibrary>?

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