Solidity根据精度来表示浮点数

https://stackoverflow.com/questions/42738640/division-in-ethereum-solidity/42739843

pragma solidity ^0.4.;

contract Divide {

  function percent(uint numerator, uint denominator, uint precision) public

  constant returns(uint quotient) {

         // caution, check safe-to-multiply here

        uint _numerator  = numerator *  ** (precision+);

        // with rounding of last digit

        uint _quotient =  ((_numerator / denominator) + ) / ;

        return ( _quotient);

  }

}