how to read different file name using for loops

I have GPM half hourly precipitation data sets with different file names, my script example and a file name is attached below, every folder has single day half hourly data sets,

Number of files per folder=48; attachments filelist=example of a file name; extraction= current program file;

I need to convert all half-hourly file into daily;

Answer 1

[KSSV]

files = dir('*.HDF5') ;
N = length(files) ;
for i = 1:N
    thisfile = files(i).name ; 
    % do what you want ;
end

[Stephen23]

shanka sharma'a "Answer" moved here and formatted properly:

@KSSV i am trying to read file by year,month,day-startime-endtime.minute using loop such as

clc,clear all
%file name=3B-HHR.MS.MRG.3IMERG.20140412-S000000-E002959.0000.V05B.HDF5

days=[31 28 31 30 31 30 31 31 30 31 30 31];

year=2013;
for i=1:3      
  year=year+1;
    month=1;
   for j=1:12 
  month=1+(j-1)
      day=1;
      for jj=1:days(j);       

    hour=1;             
           for k=1:24       
               if rem(k,2)==0
               hour=0+(k-1)*10000;
               else
               hour=3000+(k-1)*10000;
               end
               minute=30*(k-1);
               minute=minute+30
               sec=hour+2959;

      if month<10
     filein=['C:\NEW_DATA_SETS\imerg\3B-HHR.MS.MRG.3IMERG.' num2str(year) ... 
                  '' num2str(month) '' num2str(jj) '-S' num2str(hour) '-E' num2str(sec) ...
                  '.' num2str(minute) '.V05B.HDF5'];

      else
    filein=['C:\NEW_DATA_SETS\imerg\3B-HHR.MS.MRG.3IMERG.' num2str(year) ...
             '' num2str(j) '' num2str(jj) '-S' num2str(hour) '-E' num2str(sec) ...
             '.' num2str(minute) '.V05B.HDF5'];
      end
  end
  end 
  end
  end