day8: coding

day8/stl_code/d1.cpp

@@ -0,0 +1,27 @@
+// stl 标准模板库开发
+// 初次使用:
+// vector 存放基础类型的数据示例
+#include <iostream>
+#include <algorithm>
+#include <vector>
+
+using namespace std;
+
+int main()
+{
+    vector<int> v1;
+    v1.push_back(1);
+    v1.push_back(2);
+    v1.push_back(3);
+    v1.push_back(4);
+    v1.push_back(5);
+    v1.push_back(6);
+
+    // 创建迭代器
+    vector<int>::iterator it;
+    for (it = v1.begin(); it != v1.end(); it++)
+    {
+        cout << *it << " ";
+    }
+    return 0;
+}

day8/stl_code/d2.cpp

@@ -0,0 +1,46 @@
+// 存放类对象的数据 vector
+#include <bits/stdc++.h>
+
+using namespace std;
+
+class Student
+{
+    friend ostream &operator<<(ostream &out, const Student &stu);
+
+private:
+    string name;
+    int age;
+
+public:
+    Student(const string &name, int age)
+    {
+        this->name = name;
+        this->age = age;
+    }
+};
+
+ostream &operator<<(ostream &out, const Student &stu)
+{
+    out << "name: " << stu.name << ", age: " << stu.age;
+    return out;
+}
+
+int main()
+{
+    vector<Student> v;
+    v.push_back(Student("zhangsan", 20));
+    v.push_back(Student("lisi", 21));
+    v.push_back(Student("wangwu", 22));
+    v.push_back(Student("zhaoliu", 23));
+
+    v.pop_back(); // 删除最后一个元素
+
+    // 创建迭代器
+    vector<Student>::iterator it = v.end();
+    while (it != v.begin())
+    {
+        cout << *(--it) << endl; // 重载了<<运算符
+    }
+
+    return 0;
+}

day8/stl_code/d3.cpp

@@ -0,0 +1,48 @@
+// 基于 d3.cpp 的改进
+// vector 存放对象的指针
+#include <bits/stdc++.h>
+
+using namespace std;
+
+class Student
+{
+    friend ostream &operator<<(ostream &out, const Student *stu);
+
+private:
+    string name;
+    int age;
+
+public:
+    Student(const string &name, int age)
+    {
+        this->name = name;
+        this->age = age;
+    }
+};
+
+ostream &operator<<(ostream &out, const Student *stu)
+{
+    out << "name: " << stu->name << ", age: " << stu->age;
+    return out;
+}
+
+int main()
+{
+    vector<Student *> v;
+    v.push_back(new Student("张三", 18));
+    v.push_back(new Student("李四", 19));
+    v.push_back(new Student("王五", 20));
+
+    v.pop_back(); // 删除最后一个元素
+
+    // 创建迭代器
+    vector<Student *>::iterator it = v.end();
+    while (it != v.begin())
+    {
+        it--;
+        cout << *it << endl; // 重载了<<运算符
+        delete *it;          // 释放空间
+    }
+
+    return 0;
+}

day8/stl_code/d4.cpp

@@ -5,6 +5,7 @@ using namespace std;
 
 int main()
 {
+    // 注意: vector<vector<int> > vs; 防止编辑器自动格式化为 >>
     vector<vector<int> > vs; // 嵌套容器
     vector<int> v1, v2, v3;