Lab 2

contracts/Counter.sol

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.28;
+
+contract Counter {
+  uint256 public x;
+
+  function inc() public {
+    x++;
+  }
+
+  function incBy(uint256 by) public {
+    require(by > 0, "incBy: increment should be positive");
+    x += by;
+  }
+}