I have the following defined struct:

// A struct that holds all the data for a single plot of land
    struct Land {
        bytes32 geoPoint1;
        bytes32 geoPoint2;
        bytes32 geoPoint3;
        bytes32 geoPoint4;
        address owner;

and I call it using the following

Land memory _land = Land({
                geoPoint1: _geoPoint1,
                geoPoint2: _geoPoint2,
                geoPoint3: _geoPoint3,
                geoPoint4: _geoPoint4
                owner: ?????

            uint256 landID = landRegister.push(_land) - 1;

What do I put into the owner field because I want to leave that as "empty" i.e.


When someone purchases this item the field will be completed. If I leave it blank I get errors in Remix stating that there are not the expected number of fields for the struct.


  • Are you saying you don't want to use 0 for some reason? I would personally just use 0.
    – user19510
    Jan 9, 2018 at 16:03
  • No, I am pretty new to this and wasn't sure how to set a blank address. If it is as simple as using 0 then thats great. Is it just a simple case of checking for 0 when I want to determine if empty? Thanks
    – ORStudios
    Jan 9, 2018 at 16:06
  • Yes, that's it.
    – user19510
    Jan 9, 2018 at 16:09

1 Answer 1


This should work:

Land memory _land = Land({
                geoPoint1: 1,
                geoPoint2: 2,
                geoPoint3: 3,
                geoPoint4: 4,
                owner: address(0)

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