Matlab Gui Column Calculation Problems adds 48

Hello, please i need help as am trying to make some column calculations in matlab gui.

dataC = get(handles.uitable1, 'Data'); Data = cell2mat(dataC(:,1)); C = 2* Data(:,1) * pi; dataC(:,3) = num2cell(C(:,1)); set(handles.uitable1, 'Data', dataC)

With this code it adds 48 to each digit input before performing the task. And when two digits number is entered like 56 it only calculate for 5 which is the first figure alone. Anyone please help out.