[Dev-C++] necessary brackets ?

[<h.r...@gm...>]

>  Hi,
> 
> Can anybody explain me why the following Code works:
> 
> void ReadData(const char* s)
> {
>   extern Prozessfaehigkeit pf;
>   
>   ifstream in(s);
>   string line;
> 
>   getline(in, line);
>   pf.MeanS = (atof(line.c_str()));
> [...]
> 
> and 
> 
> void ReadData(const char* s)
> {
>   extern Prozessfaehigkeit pf;
>   
>   ifstream in(s);
>   string line;
> 
>   getline(in, line);
>   pf.MeanS = atof(line.c_str());
> [...]
> 
> works not ? Why is there a need for brackets ?
> Thanks in advance,
> Greetings 
> Horst
sorry for my wrong subject in last posting

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