What does 'using namespace std' mean in C++?

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STD, STI, STI, STD…What’s the difference?

First let's understand whats std stand for a namespace is: Consider thisThere are two students in one classroom having same name for example Vishal. Using namespace, you can define the context in which names are defined. What using does : The keyword using technically means, use this whenever you can. This refers, in this case, to the std namespace. So whenever the computer comes across cout, cin, endl or anything of that matter, it will read it as std::cout, std::cin or std::endl. When you don't use the std namespace, the computer will try to call cout or cin as if it weren't defined in a namespace as most functions in your codes. Since it doesn't exist there, the computer tries to call something that doesn't exist. This anti-pattern is called namespace pollution. The number of names in std is huge and growing, and a lot of them are common words. Someone reading your code later might not notice the using declaration and believe you have whats std stand for variable cout declared somewhere. Remember the golden rule: Always assume the person who will maintain your code after you have left knows where you live and owns a large axe. The best example cum answer is. Assume that you and your best friend get to do a semesters project together. The project is a little big one and your teacher has divided the assignment into two parts. One for you and the other for your friend. Now you two do your part of coding and complete each one's work. Now when your teacher gets to compile together each of your submissions and build it into a single output, she gets an error. You very well know whats the reason behind that. So now what she does is that, she uses all your codes under the namespace as Student1 and your friend's code as namespace Student2. Now when your teacher compiles your submission, something like this happens. Student1::PrintSeats Student1::X ; Student2::PrintSeats Student2::X ; Tada. That's the magic of namespace coding. Lets take a live world example. Suppose there is a Joshi family whats std stand for in Madhya Pradesh. Now the family has three children, and they are brothers. These brothers decided that after marriage if anyone of us will have a female child we will name her Shardha. Fortunately, all three brothers were enlightened with female babies. Everyone was happy and then they thought about the name and remembered what they decided in their childhood. So they named each child Shardha. Now, since the family was joint so it was getting tough to call one when three of children are together. The children were intelligent so they device one solution i. I hope you got the namespace concept here after reading the para above. Since std stands for standard, hence std has all the standard libraries available under std namespace. You can include both the namespaces in your program using namespace std; using namespace yourownnamespace; and then you can use them as per your use case std::cout yourownnamespace::cout For the purpose of clarity and managementwe create classes. To use it we simply include it using include directive. Of coursethey are different but they have the same name. The purpose is to avoid naming conflicts. Now if you include that header fileits not gonna simply include all the constructs. You need to all also specify the namespace to use. Its syntax is : using namespace ; Modern C++ standard library is now inside the std namespace. So simply including the header file will not gonna import all the constructs like cout or cin etc. You need to use the namespacewhich is std here. You can also include a particular construct You do this with : using std::cout; This is include only the coutwhile cin is still hidden. You can import the whole namespace shown above. Old compiler with old standards import all the constructs into the global namespacewhich is less good ,as name-clashing as likely to occur. As the other answers say: to bring in everything from the namespace std for the sake of avoiding namespace conflicts. A namespace is a form of scope in C++ that holds its own definitions for variables, functions, etc. For example, both cout and cin, along with some useful tokens like endl, are defined inside of std for use. As a result, there are two primary ways to access them. This means you need to use the namespace name and the scope resolutoin operator :: before the names of anything you need from std. There may even be some benefits to this in environments where memory is a concern, as you only include those objects you need, instead of the entire namespace. However, for the most part, using namespace std won't impact your development or your learning on modern computers. Use it, or not, as you see fit, just keep in mind that what it does is make everything from std available throughout the current file.

That's the magic of namespace coding. Some people try to cause him trouble, but everyone is too afraid to ask questions. B Hand or genital contact with the infected areas of the body. Clearly, the term's usage is not uniform. For more information on sexually transmitted infections, search the Go Ask Alice! C Shaking hands or hugging an infected person.