Add an example for datatype
Add an example for datatype

xnning/fcore,wxzh/fcore,bixuanzju/fcore,wxzh/fcore,xnning/fcore,xnning/fcore,bixuanzju/fcore,zhiyuanshi/fcore,hkuplg/fcore,hkuplg/fcore,zhiyuanshi/fcore,bixuanzju/fcore,hkuplg/fcore,wxzh/fcore,zhiyuanshi/fcore