Solidity运算符+与类型struct不兼容

Question

Solidity 想struct 里面upId的属性值和burnId里面的属性值，相加之后的值赋给upId。提示错误说struct 不能运算：运算符+与类型struct不兼容。请问哪位帮忙解决一下这个问题，万分感谢！！请贴代码！万分感谢！

struct Prop{
        uint16 power;        //属性值
    }
    
    mapping(uint=>Prop) public props;

//升级
    function upgrade(uint256 upId,uint256 burnId)public{
        require(ownerOf(upId)==msg.sender,"player and upId not matched");
        require(ownerOf(burnId)==msg.sender,"player and burnId not matched");
        props[upId];
        props[burnId];
        Prop memory i;
        i.power=props[upId]+ props[burnId];
        props[upId]=i;

        burn(burnId);
    }

Answer 1

    i.power=props[upId].power+ props[burnId].power;