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Frequently asked questions What is Ideone? Ideone is an online compiler and debugging tool which allows you to compile source code and execute it online in more than 60 programming languages.
Compiling allows the computer to run and understand the program without the need of the programming software used to create it. When a program is compiled it is often compiled for a specific platform (e.g., IBM platform) that works with IBM compatible computers, but not other platforms (e.g., Apple platform).
As we already mentioned, the compilation process converts high-level source code to a low-level machine code that can be executed by the target machine. Moreover, an essential role of compilers is to inform the developer about errors committed, especially syntax-related ones.
Each C++ source file needs to be compiled into an object file. The object files resulting from the compilation of multiple source files are then linked into an executable, a shared library, or a static library (the last of these being just an archive of object files).
Ok so I was messing around on Ideone and accidentally submitted this piece of code, however to my surprise it actually compiled and ran outputting a value of 0, here.
#include <iostream>
using namespace std;
const int five( )
{
const int i = 5;
}
int main() {
cout << five( ) << endl;
return 0;
}
I then tried this in Visual Studio, and on Codepad however both failed to compile because five() does not return a value, as one would expect. My question, is of course, why does this compile fine on Ideone even though the code, to my understanding is wrong and shouldn't compile.
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