皇冠客服飞机：@seo3687博彩投注网澳门博彩客户端下载    pragma solidity >=0.4.0 <0.6.0; //import "github.com/Arachnid/solidity-stringutils/strings.sol"; contract EgString { string name = 'buff'; string addr = "beijing"; unction getAddrLength()public returns(uint){ return bytes(addr).length;//获取字符串 } function concatenateWithAbi ()public returns(string memory){ return string(abi.encodePacked(name什么软件可以买足球, addr)); } /*function concatenateWithGit() public returns(string memory){ return name.toSlice().concat(addr.toSlice()); }*/ function compare1() public returns(bool){ return keccak256(bytes(name)) == keccak256(bytes(addr)); } function compare2() public returns (bool){ for (uint i = 0; i < bytes(name).length; i ++) { if(bytes(name)[i] != bytes(addr)[i]) { return false; } } } /* // parseInt(parseFloat*10^_b) function parseInt(string memory _a, uint _b) internal returns (uint) { bytes memory bresult = bytes(_a); uint mint = 0; bool decimals = false; for (uint i=0; i<bresult.length; i++){ if ((bresult[i] >= 48)&&(bresult[i] <= 57)){ if (decimals){ if (_b == 0) break; else _b--; } mint *= 10; mint += uint(bresult[i]) - 48; } else if (bresult[i] == 46) decimals = true; } if (_b > 0) mint *= 10**_b; return mint; } function uint2str(uint i) internal returns (string memory) { if (i == 0) return "0"; uint j = i; uint len; while (j != 0){ len++; j /= 10; } bytes memory bstr = new bytes(len); uint k = len - 1; while (i != 0){ bstr[k--] = byte(48 + i % 10); i /= 10; } return string(bstr); }*/ } |