pragma solidity ^0.4.18; contract SolidityTest { function getResult() public pure returns (string memory) { uint a = 1; uint b = 2; uint result = a + b; return integerToString(result); } function integerToString(uint _i) internal pure returns (string memory) { if (_i == 0) { return "0"; } uint j = _i; uint len = 0; while (j != 0) { len++; j /= 10; } bytes memory bstr = new bytes(len); uint k = len - 1; while (_i != 0) { bstr[k--] = bytes1(uint8(48 + _i % 10)); _i /= 10; } return string(bstr); } } 0.4.18