All matter is made of atoms. Atoms are the smallest particle of matter. They are so small that you cannot see them with your eyes or even with a standard microscope. A standard sheet of paper is about a million atoms thick.
Answer Wiki. The int type is a 4-byte signed integer. There are also tinyint (1 byte), smallint (2 bytes), and bigint (8 bytes), and unsigned versions of all of these. As Apostolos mentioned, the docs for all the numeric types are here: http://dev.mysql.com/doc/refman/...
Notice that strlen() and wcslen() do not include the size of the terminating null character, whose size is equal to the element size of the string type: one byte on a char* string, two bytes on wchar_t* or char16_t* strings, and four bytes on char32_t* strings.