while loop in sql not working properly

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO



ALTER PROCEDURE [dbo].[k_GetMedicineReportDatewiseStock]
	
    @fromdate datetime,
    @todate datetime,
    @mvtype varchar(50),
    @medicine varchar(50)
AS
declare
@squantity numeric(18,0),
@fquantity numeric(18,0),

 @date datetime
BEGIN
declare @i int
declare @cdate int
set @i = 0
while (@i < @cdate)

set  @cdate = (select DATEDIFF(dd,@fromdate, @todate)) 

begin

--set @date = @fromdate + 1
print '1'

print '2'
	
SET NOCOUNT ON;


set @squantity = (select sum(quantity)  from k_Master_MedicineInventory where type in (@mvtype)
 and medicinename in (@medicine) and date in (@date) )
print '3'
set @fquantity = (select sum(quantity)  from k_Master_FarmerMedicine_Disperse where type in (@mvtype)
 and medicinename in (@medicine) and date in (@date))

select MI.date,MI.quantity,MI.dcno,FD.quantity,(@squantity - @fquantity) as quantity,FD.farmcode,FD.remarks,MI.updatedby
from k_Master_MedicineInventory MI,k_Master_FarmerMedicine_Disperse FD  where MI.type in (@mvtype)
 and MI.medicinename in (@medicine) and MI.date in (@date) and FD.date in (@date) and FD.type in (@mvtype)
 and FD.medicinename in (@medicine)  order by MI.dcno

END

set @i = @i + 1
print '4'

end