Create README.md

solidity-scripting/src/W4D3/README.md

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+
+## 作业1：
+重新修改 MyWallet 合约的 transferOwernship 和 auth 逻辑，使用内联汇编方式来 set和get owner 地址
+```solidity
+contract MyWallet { 
+    public string name;
+    private mapping (address => bool) approved;
+    public address owner;
+
+    modifier auth {
+        require (msg.sender == owner, "Not authorized");
+        _;
+    }
+
+    constructor(string _name) {
+        name = _name;
+        owner = msg.sender;
+    } 
+
+    function transferOwernship(address _addr) auth {
+        require(_addr!=address(0), "New owner is the zero address");
+        require(owner != _addr, "New owner is the same as the old owner");
+        owner = _addr;
+    }
+}
+```
+
+答：
+```solidity
+contract MyWallet {
+    string public name;
+    mapping (address => bool) private approved;
+    address public owner;
+
+    modifier auth {
+         require (msg.sender == owner, "Not authorized");
+        _;
+    }
+
+    constructor(string memory _name) {
+        name = _name;
+        assembly {
+            sstore(2, caller())
+        }
+    }
+
+    function transferOwnership(address _addr) external auth {
+        require(_addr != address(0), "New owner is the zero address");
+        
+        address current_owner;
+        assembly {
+            current_owner := sload(2)
+        }
+        require(current_owner != _addr, "New owner is the same as the old owner");
+
+        assembly {
+            sstore(2, _addr)
+        }
+    }
+}
+```
+
+## 作业2：
+使用你熟悉的语言利用 eth_getStorageAt RPC API 从链上读取 _locks 数组中的所有元素值，或者从另一个合约中设法读取esRNT中私有数组 _locks 元素数据，并打印出如下内容：
+locks[0]: user:…… ,startTime:……,amount:……
+
+答：
+- https://github.com/imsoso/FoundryProjects/blob/main/solidity-scripting/src/W4D3/test/esRNTTest.sol 
+
+本地操作方法：
+1、先用 Anvil 模拟结点出来
+2、forge test --rpc-url http://127.0.0.1:8545 -vvv
+
+Logs:
+  Lock 0
+  User: 0x0000000000000000000000000000000000000001
+  StartTime: 3461774140
+  Amount: 1000000000000000000
+  ----------------
+  Lock 1
+  User: 0x0000000000000000000000000000000000000002
+  StartTime: 3461774139
+  Amount: 2000000000000000000
+  ----------------
+  Lock 2
+  User: 0x0000000000000000000000000000000000000003
+  StartTime: 3461774138
+  Amount: 3000000000000000000
+  ----------------
+  Lock 3
+  User: 0x0000000000000000000000000000000000000004
+  StartTime: 3461774137
+  Amount: 4000000000000000000
+  ----------------
+  Lock 4
+  User: 0x0000000000000000000000000000000000000005
+  StartTime: 3461774136
+  Amount: 5000000000000000000
+  ----------------
+  Lock 5
+  User: 0x0000000000000000000000000000000000000006
+  StartTime: 3461774135
+  Amount: 6000000000000000000
+  ----------------
+  Lock 6
+  User: 0x0000000000000000000000000000000000000007
+  StartTime: 3461774134
+  Amount: 7000000000000000000
+  ----------------
+  Lock 7
+  User: 0x0000000000000000000000000000000000000008
+  StartTime: 3461774133
+  Amount: 8000000000000000000
+  ----------------
+  Lock 8
+  User: 0x0000000000000000000000000000000000000009
+  StartTime: 3461774132
+  Amount: 9000000000000000000
+  ----------------
+  Lock 9
+  User: 0x000000000000000000000000000000000000000A
+  StartTime: 3461774131
+  Amount: 10000000000000000000
+  ----------------
+  Lock 10
+  User: 0x000000000000000000000000000000000000000b
+  StartTime: 3461774130
+  Amount: 11000000000000000000
+