Merge pull request '1' (#7) from dev_jiaolong into main

Reviewed-on: violeteverisland/learn_cpp#7

字符串拼接.cpp

@@ -0,0 +1,15 @@
+//
+// Created by viole on 2026/2/24.
+//
+#include "iostream"
+using namespace std;
+int main() {
+    string a = "1";
+    string b = "12";
+    string c = "13";
+    string d = "14";
+    int e = 12;
+    cout << a+b<<c+d<<a+to_string(e)<< endl;
+    bool b1 = true;
+    return 0;
+}