Verifies the value of an interface element attribute and converts it to a float value.
float IupGetFloat(Ihandle *element, char *a) [in C] [There is no equivalent in IupLua]element: Identifier of the interface element.
a: name of the attribute.
This function returns a float corresponding to the attribute’s value.
The call to IupGetFloat may cancels IUP’s internal buffer. This means that after the call to IupGetFloat, the contents previously returned by function IupGetAttribute may no longer valid.