As Walter points out beflow, that it prints an integer zero indicates the calculation of the p-value underflowed and the returned value was identically zero.
If it's a case of lack of precision on the command window, you can do something like:
fmt=['%5d%5d' repmat('%12.4f',1,3) '%12.3e\n'];
fprintf(fmt,c.')
In this case the values would be displayed 0.0000 if in format short mode, format long would give 15 digits but E-29 would still have underflowed.
