pragma solidity ^0.4.0;
contract EMath{
string public _a="lin";
function f() public{
modify(_a);
}
//function modify(string storage name) private{
function modify(string memory name) private{
//string storage c = name;Type string memory is not implicitly convertible to expected type string storage pointer
var c = name;
bytes(c)[0] ='L';
}
//uint8 ~ uint256
//0000 0000 ~ 1111 1111
//0 ~255
//int8 ~ int256
//1111 1111 ~ 0111 1111
//-127 + 127 +0 =255
uint8 a=3;
//0000 0011
uint8 b=6;
//0000 0110
function yihuo() view returns(uint){
return a ^ b;
/*
0000 0011
0000 0110
0000 0101
*/
}
function yifeihuo() view public returns(uint16){
return ~(a ^ (~b));
/*
0000 0011
0000 0110
1111 1001
1111 1010
*/
}
function huo() returns(uint){
return a | b;
/*
0000 0011
0000 0110
0000 0111
*/
}
function yu() returns(uint){
return a & b;
/*
0000 0011
0000 0110
0000 0010
*/
}
function left() returns(uint8){
return a<<2;
/*
0000 0011
0000 1100
*/
}
enum Cants{left,right,mid}
Cants public def=Cants.left;
function re(Cants c1) returns(bool){
if (def ==c1){
return true;
}
}
struct fun{
uint _id;
string _name;
uint _sex;
}
//0x14723a09acff6d2a60dcdf7aa4aff308fddc160c
//0x4b0897b0513fdc7c541b6d9d7e929c4e5364d2db
fun n1=fun(0,'eilinge',1);
fun n2=fun(1,'lin',0);
fun[] public funs;
fun[] public funids;
function p1() public{
funs.push(n1);
funs.push(n2);
}
uint funid;
mapping(address=> fun) addfun;
function p2(address na1) public{
fun memory f1 =addfun[na1];
//f1(2,'eil',0);type is not callable
f1._id=2;
}
}
contract Addr{
address _owner =0xca35b7d915458ef540ade6068dfe2f44e8fa733c;
uint160 _c = 1154414090619811796818182302139415280051214250812;
/*
0x ca35b7d915458ef540ade6068dfe2f44e8fa733c :.legnth=40
c a
0b 1100 1010 :.length=40*4=uint160
*/
function f1() constant returns(uint160){
return uint160(_owner);
}
function f2() constant returns(address){
return address(_c);
}
function getBalance(address add) payable returns(bool){
//return add.balance;
add.transfer(msg.value);//msg.sender => add
}
bytes1 _a=0xf0;
//0010 0010; 1*8
bytes32 public _b=0x231231;
//32*8
function getLeng() returns(bytes1){
//return _b.length;
return _a[0];
}
function getLeng1() {
//_b.length =5;Expression has to be an lvalue
}
string public _d='lilianjie';
//bytes public _f =new bytes;type function (uint256) pure returns (bytes memory)
//is not implicitly convertible to expected type bytes storage ref
bytes public _f =new bytes(2);
function bytestring() constant returns(bytes){
return bytes(_d);
}
function stringbytes() constant returns(string){
return string(_f);
}
function modifybytes() public{
//_d.length=5;
//Member "length" not found or not visible after argument-dependent lookup in string storage ref
bytes(_d).length=5;
_f.length=3;
//_d[0]='E';Member "length" not found or not visible after argument-dependent lookup in string storage ref
bytes(_d)[0]="L";
}
}