enum Formats {
    DEC = 1;
    HEX = 0x1F;
    OCT = 017;
}

message Msg {
    required int32 dec = 1 [default=-1];
    required int32 hex = 2 [default=-0x1F];
    required int32 oct = 3 [default=-017];
    required int32 exp = 4 [default=0.1e5];
}
