Alcun file

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Love Freesound? Donate Now. Freesound Projects. An initiative of. Its mostly for convenience so that you do not have to use the fully qualified name all the time. This page explains it in some detail. The include statement is a pre processor directive and it tells the preprocessor to treat the contents of a specified file as if those contents had appeared in the source program at the point where the directive appears. That is, you can think of this statement as copying the included file into the current one.

The compiler then compiles the entire file as if you wrote all the code in one big file. While using namespace std; isn't necessarily a bad idea, using it for all namespaces will eliminate the whole benefit.

Namespaces exist so that you can write modules without regard to name clashes with other modules, and using namespace this; using namespace that; can create ambiguities.

I think the other answers are missing the point slightly. So that's not different. And in C you have to add a reference to the other assembly. That takes care of the equivalent of includes and link settings. You need to understand namespaces if you want to truly understand this. With using namespace you are declaring you are using a given namespace that contains stuff such as cout.

Even Stroustrup refers to the include mechanism as somewhat hackish. However it does make separate compilation much easier ship compiled libraries and headers instead of all source code. The best example I know of about why include isn't enough comes from Sun. Apparently Sun developers had some trouble with one of their products because they had written a mktemp function that happened to have the same signature as a mktemp function that was included through from a file that was itself included through a header the project actually wanted.

Of course the two functions were not compatible, and one could not be used as a substitute for the other. On the other hand, the compiler and linker did not realize this when building the binary, and sometimes mktemp would call one function, and sometimes it would call another, based on the order different files were compiled or linked.

And C has only a global namespace. Both C and Java 1 have a namespace mechanism namespace in C , package in Java , 2 are usually developed through IDEs that handle referring to binaries for the developer, and 3 don't allow freestanding functions a class scope is something of a namespace, and reduces the risk of polluting the global namespace so they have a different solution to this problem. It should be noted that a header file generally contains functions and classes declared within a namespace.

Notice that in your code the vector class is still located in the std namespace. However, your main function is in the default global namespace, so simply including the header will not make the vector class visible in global namespace. You have to either use using or do prefixing like std::vector. How are we doing?

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Active 1 year, 7 months ago. Viewed 75k times. Eric Leung 1, 11 11 silver badges 22 22 bronze badges. Add a comment. Active Oldest Votes. But for simplicity, i'm just using java. Johannes Schaub - litb Johannes Schaub - litb k gold badges silver badges bronze badges. This answer should be accepted. This is by design and useful. You can include things that without namespaces would be ambiguous.

Rann Lifshitz 3, 4 4 gold badges 21 21 silver badges 40 40 bronze badges. Tim Tim Motti Motti k 46 46 gold badges silver badges bronze badges. RFV5s it's supposed to indicate that the first namespace eg is in a file called a. The include is defining the existence of the functions.