Why we use #include Iostream in C++?

iostream is the header file which contains all the functions of program like cout, cin etc. and #include tells the preprocessor to include these header file in the program. It is a header file in c++which is responsible for input and output stream.

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Can we use using namespace std in Turbo C++?

You will never need using namespace std in Turbo C++ because it doesn't support namespaces. Turbo C++ doesn't support probably 50% of C++ stuff - it's that old. Use Visual C++ (Express editions are free) or G++ for C++. How do you include a namespace std in C++? 1.4 C++ and C libraries and the std namespace

1. Specify the standard namespace, for example: std::printf("example\n");
2. Use the C++ keyword using to import a name to the global namespace: using namespace std; printf("example\n");
3. Use the compiler option --using_std .

How many namespaces are there in C++?

Available Namespaces

There are three main namespaces. The ISO C++ standards specify that "all library entities are defined within namespace std." This includes namespaces nested within namespace std , such as namespace std::chrono . What does * * mean? a small starlike symbol (*), used in writing and printing as a reference mark or to indicate omission, doubtful matter, etc. Linguistics. the figure of a star (*) used to mark an utterance that would be considered ungrammatical or otherwise unacceptable by native speakers of a language, as in * I enjoy to ski.

Where is std :: cout defined?

The cout object is used to display the output to the standard output device. It is defined in the iostream header file. What is cin and cout? cin is an object of the input stream and is used to take input from input streams like files, console, etc. cout is an object of the output stream that is used to show output. Basically, cin is an input statement while cout is an output statement. They also use different operators.

What should be the location of using namespace std in C++ code?

Explanation:

• It is known that “std” (abbreviation for the standard) is a namespace whose members are used in the program.
• So the members of the “std” namespace are cout, cin, endl, etc.
• This namespace is present in the iostream. h header file.
• Below is the code snippet in C++ showing content written inside iostream. h:

How do I create a C++ program? How to write the first C++ program?

1. Get a C++ Compiler. This is the first step you'd want to do before starting learning to program in C++.
2. Write a C++ program. Now that you have a compiler installed, its time to write a C++ program.
3. Compile the Program.
4. Run the program.
5. Output.

What is the equivalent of using namespace std in C?

std is an abbreviation of standard. std is the standard namespace. cout, cin and a lot of other things are defined in it. you can also call these functions using std::cout , std::cin etc.