Here's one: there's no namespace in C
They are(simply put) the things that you import.... EXAMPLE: VB Import (namespace) C# Using (namespace)
No, the use of 'namespace std' is not compulsory. You can specifiy it on any object reference. Specifying 'namespace' simply provides a default value. Contrast ... using namespace std; cout << "Hello world!" << endl; ... with ... std::cout << "Hello world!" << std::endl;
#include <iostream> using namespace std;
No. You can't use namespace std even if you include stdio.h. At the very least you must include stddef.h before you can use namespace std.
The std namespace is the standard library, which includes many of the common data types, constants, structures, classes and functions that you will use to create C++ programs. There are very few non-trivial C++ programs that do no make use of at least some portion of the standard library at some point. Note that you need only include those portions you actually use; there is no need to include the entire standard library. Any built-in functions that require the standard library will include only as much as they need to, whether you yourself include those portions or not.
They are(simply put) the things that you import.... EXAMPLE: VB Import (namespace) C# Using (namespace)
They are(simply put) the things that you import.... EXAMPLE: VB Import (namespace) C# Using (namespace)
No, the use of 'namespace std' is not compulsory. You can specifiy it on any object reference. Specifying 'namespace' simply provides a default value. Contrast ... using namespace std; cout << "Hello world!" << endl; ... with ... std::cout << "Hello world!" << std::endl;
If you do not include the directive using namespace stdin your program, any references to objects in namespace std will need be be qualified with that namespace. For instance...cout
#include <iostream> using namespace std;
#include<iostream> int main() { using namespace std; char c='A'; do { cout<<c; }while(c++<'Z'); cout<<endl; }
A namespace is a group of related identifiers.namespace ns {int i;double d;}Inside namespace ns, i and d can be used normally. Outside namespace ns, i is called ns::i and d is called ns::d. To import i into the current scope, say "using ns::i;". To import all identifiers in ns into the current scope, say "using namespace ns;". Namespaces can be nested:namespace ns1 {namespace ns2 {int i;}int i;}The i in namespace ns1 is fully qualified as ns1::i. The i in namespace ns2 is fully qualified as ns1::ns2::i. The two variables are distinct. Inside ns2, i refers to ns1::ns2::i; inside ns1, i refers to ns1::i.
No. You can't use namespace std even if you include stdio.h. At the very least you must include stddef.h before you can use namespace std.
There is basically no disadvantage of using a language like C. It depends on the programmer how he uses his skills.
#include <iostream> using standard namespace std; int main() { cout << "your prob shouldn't be taking c++"; return 0; }
The std namespace is the standard library, which includes many of the common data types, constants, structures, classes and functions that you will use to create C++ programs. There are very few non-trivial C++ programs that do no make use of at least some portion of the standard library at some point. Note that you need only include those portions you actually use; there is no need to include the entire standard library. Any built-in functions that require the standard library will include only as much as they need to, whether you yourself include those portions or not.
c