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pragma solidity ^0.4.18;
contract MyContract {
  struct Cat {
    uint id;
    uint age;
    uint point;
  }
  Cat[] cats;
  function getCat(uint _id) public view returns(uint[]){
    uint[] memory retCat = new uint[](3);
    if(cats.length <= _id){
      return retCat;
    }
    Cat memory cat = cats[_id];
    retCat[0] = cat.id;
    retCat[1] = cat.age;
    retCat[2] = cat.point;
    return retCat;
  }
  function getCatAll() public view returns(uint[]){
    uint len = cats.length;
    uint[] memory data = new uint[](3*len);
    uint dataIdx = 0;
    for(uint i=0; i<len; i++){
      Cat memory cat = cats[i];
      data[dataIdx++] = cat.id;
      data[dataIdx++] = cat.age;
      data[dataIdx++] = cat.point;
    }
    return data;
  }
  function generateCat() public returns (uint[]){
    Cat memory cat;
    cat.id = cats.length;
    cat.age = cat.id + 1000;
    cat.point = cat.id + 100000;
    cats.push(cat);
    // for return
    uint[] memory catData = new uint[](3);
    catData[0] = cat.id;
    catData[1] = cat.age;
    catData[2] = cat.point;
    return catData;
  }
}