Why it is important to write “using namespace std” in C++ program?

As the same name can’t be given to multiple variables, functions, classes, etc. in the same scope. So to overcome this situation namespace is introduced.
What is the use of using namespace std in C++?

It just makes your code easier to write. "iostream" library has a class that is called "std". The code "using namespace std;" tells your compiler that if you find a method being called that is in "std" class, then immediately use method in that class.
What is namespace in C++ with example?

A namespace is a declarative region that provides a scope to the identifiers (the names of types, functions, variables, etc) inside it. Namespaces are used to organize code into logical groups and to prevent name collisions that can occur especially when your code base includes multiple libraries.
What is the difference between iostream and namespace std?

iostream contains all the declarations for input and output. Namespace std is used to tell that we are using cout and cin which were part of std namespace. You can create your own variables named cout and cin in your own namespace.
What is the advantage of using a C++ namespace?

A namespace in C++ is a way to group related classes, functions, and variables together under a unique identifier. It helps to avoid naming conflicts and improves code organization. For example, let's say you have two functions with the same name in your code, but they do different things.
Why use namespace std in C++?

Namespace in C++ is the declarative part where the scope of identifiers like functions, the name of types, classes, variables, etc., are declared. The code generally has multiple libraries, and the namespace helps in avoiding the ambiguity that may occur when two identifiers have the same name.
Can we create our own namespace?

We can declare variables, functions, classes, and nested namespaces within the namespace. Declaring all members of a namespace at once is not a requirement. Instead, we can define nampespace in multiple sections, each with its own set of declarations.
What is the syntax for defining a namespace?

In C++, the syntax of the namespace is the keyword itself. You can declare a class by using the keyword as namespace. You can also use the declaration for a single identifier as : using std:: string.
What is the difference between namespace and class?

A namespace is a way of grouping identifiers so that they don't clash. A class is defeinition of an object that can be instantiated (usually) and which encapsulates functionallity and state.
How to create your own namespace in C++?

C++ allows us to define our own namespaces via the namespace keyword. Namespaces that you create in your own programs are casually called user-defined namespaces (though it would be more accurate to call them program-defined namespaces).

Requirement

A namespace is a declarative region that provides a scope to the identifiers (the names of types, functions, variables, etc) inside it. Namespaces are used to organize code into logical groups and to prevent name collisions that can occur especially when your code base includes multiple libraries.

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A namespace is a declarative region that provides a scope to the identifiers (the names of types, functions, variables, etc) inside it. Namespaces are used to organize code into logical groups and to prevent name collisions that can occur especially when your code base includes multiple libraries.

Using namespace std