C++ Articles - Page 713 of 719

How to initialize memory with a new operator in C++?

Akansha Kumari
Updated on 06-May-2025 18:36:44

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In C++, the new operator is mainly used for allocating memory on the heap, but to initialize that memory, you need to explicitly declare and provide a value to it.Here, the new operator dynamically allocates memory for a variable or object during runtime and returns a pointer to the allocated memory.  Here are the following ways you can initialize memory using the new operator: For built-in types For arrays For objects new Operator in Built-in Types The built-in types are the basic data types in C++, which ... Read More

What are cin, cout and cerr streams in C++?

Akansha Kumari
Updated on 06-May-2025 19:07:14

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The cin, cout, cerr, and clog are streams that handle standard input and output stream objects, which are defined in an header file. Standard Output Stream (std::cout) The cout is an object of class ostream that represents the standard output stream oriented to narrow characters (of type char). It corresponds to the C stream stdout. The standard output stream is the default destination of characters determined by the environment. This destination may be shared with more standard objects (such as cerr or clog). Syntax Here is the following syntax for cout in C++: cout

What is the difference between the dot (.) operator and -> in C++?

Akansha Kumari
Updated on 07-May-2025 19:14:19

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In C++, both dot (.) and arrow (->) operators are used to access members of classes, structures, and unions. But they are used in different scenarios based on how the object is being accessed. In this article, we will learn the differences and uses of these two operators in C++. Dot Operator (.) The dot(.) operator is used to access members (variables and functions) of a class, structure, or union when working with its object (not a pointer). It allows you to access and manipulate the object's properties by directly interacting with members of an object. Syntax Here is the ... Read More

What are the basic rules and idioms for operator overloading in C++?

Anvi Jain
Updated on 19-Jun-2020 05:21:04

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When it comes to operator overloading in C++, there are 3 basic rules you should follow. like all such rules, there are so exceptions. These 3 rules are −1.  Whenever the meaning of an operator is not obviously clear and undisputed, it should not be overloaded. Instead, provide a function with a well-chosen name. Basically, the first and foremost rule for overloading operators, at its very heart, says:Don’t do it.That might seem strange, but there are only a few cases where operator overloading is appropriate. The reason is, it is hard to understand the semantics behind the application of an ... Read More

What is C++ Standard Error Stream (cerr)?

Arushi
Updated on 10-Feb-2020 13:41:41

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std::cerr is an object of class ostream that represents the standard error stream oriented to narrow characters (of type char). It corresponds to the C stream stderr. The standard error stream is a destination of characters determined by the environment. This destination may be shared by more than one standard object (such as cout or clog).As an object of class ostream, characters can be written to it either as formatted data using the insertion operator (operator

What is the ?-->? operator in C++?

Nitya Raut
Updated on 10-Feb-2020 13:37:58

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There is no such operator in C++. Sometimes, we need to create wrapper types. For example, types like unique_ptr, shared_ptr, optional and similar. Usually, these types have an accessor member function called .get but they also provide the operator→ to support direct access to the contained value similarly to what ordinary pointers do.The problem is that sometimes we have a few of these types nested into each other. This means that we need to call .get multiple times or to have a lot of dereference operators until we reach the value.Something like this −wrapper wp; wp.get().get().length(); wp.get()->length();This can be a ... Read More

C++ Standard Library Header Files

Akansha Kumari
Updated on 12-May-2025 19:38:45

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Standard Library header files are the predefined files in C++, which are part of the built-in library. It consists of declarations for functions, classes, objects, and macros. These header files give you access to perform various operations like input/output, string manipulation, containers, algorithms, math operations, and many more. Here is the following list of all the types of libraries under the standard Library Header Files. Utilities library Dynamic memory management Numeric limits Error handling String library ... Read More

What is Pointer operator * in C++?

Vrundesha Joshi
Updated on 10-Feb-2020 13:32:01

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C++ provides two pointer operators, which are Address of Operator (&) and Indirection Operator (*). A pointer is a variable that contains the address of another variable or you can say that a variable that contains the address of another variable is said to "point to" the other variable. A variable can be any data type including an object, structure or again pointer itself.The indirection Operator (*), and it is the complement of &. It is a unary operator that returns the value of the variable located at the address specified by its operand. For example, Example#include using namespace ... Read More

What is pointer operator & in C++?

Rishi Rathor
Updated on 10-Feb-2020 13:30:36

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C++ provides two pointer operators, which are Address of Operator (&) and Indirection Operator (*). A pointer is a variable that contains the address of another variable or you can say that a variable that contains the address of another variable is said to "point to" the other variable. A variable can be any data type including an object, structure or again pointer itself.The address of Operator (&), and it is the complement of *. It is a unary operator that returns the address of the variable(r-value) specified by its operand. For example, Example#include using namespace std; int main ... Read More

What is arrow operator in C++?

Akansha Kumari
Updated on 15-May-2025 16:19:06

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The array operator provides the direct access to array elements using their index. What is Array Operator in C++? The arrow operator in C++ is also known as the member access operator, which is used to access a member of a class, structure, or union with the help of a pointer to an object. The arrow operator allows you to directly access the member, unlike the dot operator, which first dereferences the pointer and then uses the dot operator to access it. So instead of using (*pointer).member, you can directly use pointer->member. Syntax Here is the syntax to access array ... Read More

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