zero char is returned as space

Hi,

could you help me understand if this is an intended behaviour, or I'm incorrectly querying a "char" field? I have simple table with column declared as:

  c_tinyint char NOT NULL

The column contains tiny integers in range 0-10. When I query the column from my app using libpq values 1-10 are returned correctly as 0x1-0x10. But value of zero is returned as 0x20 (expected 0x0).

The pgAdmin displays result of the query

SELECT c_tinyint, ascii(c_tinyint) FROM tbl

as shown below:

| c_tinyint       | ascii     |

| character(1) | integer |

|                     |  0         |