This is for what??

Question

using namespace std;

Answer 1

"using namespace std;"
Lets you use the commands in the "iostream" file without writing std:: in front of it.

Example WITH "using namespace std;":
cout << "Hello!";

WITHOUT "using namespace":
std::cout <<"Hello!";

You just get rid of the std:: part which is pretty handy when writing large code.

Answer 2

all functions in the standard library are defined in the namespace std, if you don't write "using namespace std" you have to write std:: for every function you use from the standard library.
exp:
std::cout << "Hello World" << std::endl;

Answer 3

In C++ the standard method are in std namespace. Without this statement, you can call standard method like "cout" or "cin" writing "std::cout" or "std::cin".

Answer 4

tnx vry much

Answer 5

"using namespace std;"
why we are use this words? what is the mean?