What does node[0] mean in when using a module

[maths soso]

In one of the veins projects, in the "RSUExampleScenario.ned", the following command: 

node[0]: Car{} 

has been declared, I just started learning NED, I can't understand the meaning of that line, declaring 0 cars,? isn't it supposed to be node[1] if only one car is necessary like many other programming languages? and how does Veins create a node for each vehicle ? I cannot find anywhere that is specified to create a node for each vehicle. My understanding of the Scenario.ned is to create only one node for the whole simulation.

[Dragos Ilie]

Many popular programming languages (C, C++, Java and Python) use index 0 to access the first element in an array. From what I remember, the reason is that the generated code will place the array starting at a memory address p. If we use assume the array consists of bytes, the first element is at address p+0, the second element at p+1 and so on. So the index represents the “distance” from the start of array. Ned follows the same convention

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[maths soso]

Thank you, I am aware of that, I am asking two questions :

- Why when declaring the array we use node[0], in the languages you mentioned you need to put the size of the array instead of 0.

- And what makes omnet++ add more nodes when vehicles are spawned?