class Fl_Value_Slider : public Fl_Slider

These are sliders with a box displaying the current value.

There is only ohe subtype:

Currently the only way to get other types of value sliders is to provide a value for type(). See Fl_Slider for these values.

Fl_Value_Slider(int x,int y,int w,int h, const char *l = 0);
Fl_Value_Slider(int type, int x,int y,int w,int h, const char *l);

The default constructor makes a vertical slider. The second constructor takes a value for type().

uchar precision() const ;
void precision(uchar a);

Get or set the precision, which is how many digits are printed after the decimal point.

uchar textfont() const;
void textfont(uchar);
uchar textsize() const;
void textsize(uchar);
uchar textcolor() const;
void textcolor(uchar);

Get or set the font, font size, or color of the text. This is black by default.