The small keyword designates an 8-bit integer number. The small keyword can be preceded by either the keyword signed or the keyword unsigned. The int keyword is optional and can be omitted. To the MIDL compiler, a small integer is signed by default and is synonymous with signed small int.
The small integer type is one of the base types of the IDL language. The small integer type can appear as a type specifier in const declarations, typedef declarations, general declarations, and function declarators (as a function-return-type specifier and as a parameter-type specifier). For the context in which type specifiers appear, see IDL.
The sign of the small type can be modified by the MIDL compiler switch /char. To avoid confusion, specify the sign of the integer type with the keywords signed and unsigned.