C++ ekdaaam basics!

The problem with second one is that the line comes after int main().

int main() means the start of the function main().
After this whatever comes in { } is the definition of the function main() or the program essentially..

In C++, it is required the function definition to follow after the declaration or here int main().

So if you flip the actual method, the declaration comes and the compiler doesnt find any definition and wonders "What the hell happened?" [3]

try doing something like this.

#include <iostream>
int main();
using namespace std;
int main()
{}

I learnt most of C++ (whatevr I know) by trying. I dont know what the outcome of the above code will be. You can try and see whether it works.

First of all, do you know what a namespace is?
A 'namespace' divides the global scope into different subscopes in which you can write different or same lines of code (same lines of code differentiated by their namespaces).
In the iostream header file, the regular operators that you use, such as cout and cin, are stored in the 'std' namespace. If I didn't write using namespace std, I would have to write cout as std::cout (:: is scope resolution operator) and cin as std::cin throughout the program.
Now if we write using namespace std inside the main() function's definition, you won't have to write std::whatever inside the main, but you will have to do so for other functions that you may declare.

#include <iostream>

void poop() //Some function
{
std::cout << "Blah"; //I didn't use the std namespace.
}

int main()
{
using namespace std;
cout << "Blah"; //Used the namespace.
return 0;
}

Thus if I wrote the using namespace part outside all functions(in the global scope of our program), I would not have to use it repeatedly inside my program's different methods/functions. That is why we write it outside.

One more thing. This isn't really an easy kind of question if you've been using C or Turbo C++ instead of the latest ANSI-C++ compilers. It really bugs you. So never underestimate yourself but keep a learning attitude, which you always do, subho :)

^^^^

Now that's some information. But pritish bhaiya, is writing the namespace after a declaration legal? That is if the declaration has no termination?

No I'm talking abt int main()

Is the second piece of code that subho da uploaded valid considering the definition of main follows after the "using namespace"!

:D Get any other than Turbo C++. It is horrendously outdated. Get DevCpp IDE (with default MinGW compiler). Works perfectly.

Happy to hell! :D

The BCC (Borland C Compiler) works fine - many here prefer it over DEV or TURBO.

I think it is available free on net.