type casting string to double

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Hello guys,
I hope you can help me here, I am trying to convert a string (which I know represents a double) into a double.

string filename = "comms/signalmt4.txt";

int file = FileOpen(filename, FILE_READ, ' ');

if(file>0)

{

ordertype = FileReadString(file);

lowrange = FileReadString(file);

highrange = FileReadString(file);

slippage = FileReadString(file);

}//end if

lowrange is a string, if I wanted to convert it into a double say:

double temp = lowrange; //how would I do it?

Thank you

[[Deleted]]

I found the answer, use the conversion function, hope this helps someone else:

https://docs.mql4.com/convert/StrToDouble