Returns the value of an interface element attribute as a floating point number.
float IupGetFloat(Ihandle *ih, const char *name) [in C] float IupGetFloatId(Ihandle *ih, const char *name, int id) [in C] float IupGetFloatId2(Ihandle* ih, const char* name, int lin, int col) [in C] [There is no equivalent in Lua]
ih: Identifier of the interface element.
name: name of the attribute.
id, lin, col: used when the attribute has additional ids.
Returns: a float corresponding to the attribute’s value.