settings object
This method will read the data contained in a numeric value.
double read_number(string value_name)
Parameters:
value_name
The name of the value to read.
Return value:
The value on success, or 0 on failure.
Remarks:
If an error occurs, the method will return 0 and the last_error flag will be set.
Example:

    // Read the music volume from the registry.

    void main()
    {
    settings game_data;
    bool success=game_data.setup("Testtime Interactive", "Bonebreaker", false);
    if(!success)
    {
    alert("Error", "Could not access the registry.");
    exit();
    }
    if(!game_data.exists("music_volume"))
    {
    alert("Error", "Could not read music_volume. The specified value does not exist.");
    exit();
    }
    double vol=game_data.read_number("music_volume");
    if(last_error<0)
    {
    alert("Error", "Could not access music_volume.");
    exit();
    }
    alert("Music Volume", vol);
    }