1.补全ex3
1 #include <iostream> 2 #include <vector> 3 #include <string> 4 using namespace std; 5 6 // 函数声明 7 void output1(vector<string> &); 8 void output2(vector<string> &); 9 10 int main() 11 { 12 vector<string>likes, dislikes; // 创建vector<string>对象likes和dislikes 13 likes.push_back("《他改变了中国》"); 14 likes.push_back("native faith"); 15 likes.push_back("火星救援"); 16 likes.push_back("pid：19766212"); 17 likes.push_back("幸运☆星"); 18 likes.push_back("慢跑"); 19 likes.push_back("暂无"); 20 // 为vector<string>数组对象likes添加元素值 ( favorite book, music, film, paintings,anime,sport,sportsman,etc) 21 // 补足代码 22 // 。。。 23 24 25 cout << "-----I like these-----" << endl; 26 output1(likes); 27 // 调用子函数输出vector<string>数组对象likes的元素值 28 29 dislikes.push_back("矫情的"); 30 dislikes.push_back("节奏强过头的"); 31 dislikes.push_back("强行改编毁原著的"); 32 dislikes.push_back("超现实主义"); 33 dislikes.push_back("某抗中奇侠"); 34 dislikes.push_back("短跑"); 35 dislikes.push_back("暂无"); 36 // 为vector<string>数组对象dislikes添加元素值 37 38 cout << "-----I dislike these-----" << endl; 39 output1(dislikes); 40 // 调用子函数输出vector<string>数组对象dislikes的元素值 41 42 likes.swap(dislikes); 43 // 交换vector<string>对象likes和dislikes的元素值 44 45 46 cout << "-----I likes these-----" << endl; 47 output2(likes); 48 // 调用子函数输出vector<string>数组对象likes的元素值 49 50 cout << "-----I dislikes these-----" << endl; 51 output2(dislikes); 52 // 调用子函数输出vector<string>数组对象dislikes的元素值 53 54 55 return 0; 56 } 57 58 59 // 函数实现 60 // 以下标方式输出vector<string>数组对象v的元素值 61 void output1(vector<string> &v) { 62 int i; 63 for (i = 0; i < v.size(); ++i) { 64 cout << v[i] << " "; 65 } 66 cout << endl; 67 } 68 69 // 函数实现 70 // 以迭代器方式输出vector<string>数组对象v的元素值 71 void output2(vector<string> &v) { 72 vector<string>::iterator it; 73 cout << "（迭代器）" << " "; 74 for (it = v.begin(); it != v.end(); ++it) { 75 cout << *it << " "; 76 }cout << endl; 77 }
6.17
1 #include<iostream> 2 using namespace std; 3 4 int main() { 5 int *p; 6 *p = 9; 7 cout << "The value at p:" << *p; //vs错误代码 c4700 指针p没有被初始化，没有指向地址 8 return 0; 9 }
修改
1 #include<iostream> 2 using namespace std; 3 4 int main() { 5 int *p; 6 int i; 7 p = &i; 8 *p = 9; 9 cout << "The value at p:" << *p; 10 return 0; 11 }
6.18
1 include<iostream> 2 using namespace std; 3 int fn1() { 4 int *p = new int(5); //只有new 没有delete 5 return *p; 6 } 7 int main() { 8 int a = fn1(); 9 cout << "the value of a is:" << a; 10 return 0; 11 }
修改
1 #include<iostream> 2 using namespace std; 3 int fn1() { 4 int *p = new int(5); 5 return *p; 6 delete p; 7 } 8 int main() { 9 int a = fn1(); 10 cout << "the value of a is:" << a; 11 return 0; 12 }
3. 实现一个动态矩阵类 Matrix
matrix.h
1 class Matrix { 2 public: 3 Matrix(int n); // 构造函数，构造一个n*n的矩阵 4 Matrix(int n, int m); // 构造函数，构造一个n*m的矩阵 5 Matrix(const Matrix &X); // 复制构造函数，使用已有的矩阵X构造 6 ~Matrix(); //析构函数 7 void setMatrix(const float *pvalue); // 矩阵赋初值,用pvalue指向的内存块数据为矩阵赋值 8 void printMatrix() const; // 显示矩阵 9 inline float &element(int i, int j); //返回矩阵第i行第j列元素的引用 10 inline float element(int i, int j) const;// 返回矩阵第i行第j列元素的值 11 void setElement(int i, int j, int value); //设置矩阵第i行第j列元素值为value 12 inline int getLines() const; //返回矩阵行数 13 inline int getCols() const; //返回矩阵列数 14 private: 15 int lines; // 矩阵行数 16 int cols; // 矩阵列数 17 float *p; // 指向存放矩阵数据的内存块的首地址 18 };
matrix.cpp
1 #include <iostream> 2 #include "matrix.h" 3 using namespace std; 4 Matrix::Matrix(int n) :lines(n), cols(n) { //构造函数的实现 5 p = new float[lines*cols]; 6 } 7 Matrix::Matrix(int n,int m) : lines(n), cols(m) { //重载 8 p = new float[lines*cols]; 9 } 10 Matrix::~Matrix() { //析构函数 11 delete p; 12 } 13 Matrix::Matrix(const Matrix &X) :lines(X.lines),cols(X.cols){ //复制构造函数的实现 14 p = new float[lines*cols]; 15 for (int i= 0;i < lines*cols; i++) 16 p[i] = X.p[i]; 17 } 18 void Matrix::setMatrix(const float *pvalue) { //给矩阵赋值 19 for (int i = 0; i < lines*cols; i++) 20 p[i] = pvalue[i]; 21 } 22 void Matrix::printMatrix() const { //输出矩阵 23 for (int i = 0; i < lines; i++) { 24 for (int j = 0; j < cols; j++) 25 cout << p[i*cols + j] << " "; 26 cout << endl; 27 } 28 } 29 inline int Matrix::getLines() const {return lines;}//行数 30 inline int Matrix::getCols() const {return cols;} //列数 31 32 inline float &Matrix::element(int i, int j) { //以下三个不知道对不对 33 return p[(i - 1)*cols + j - 1]; 34 } 35 inline float Matrix::element(int i, int j) const { return p[(i-1)*cols + j-1]; } 36 void Matrix::setElement(int i, int j, int value) { element(i,j) = (float)value;}
main.cpp
1 #include<iostream> 2 #include"matrix.h" 3 using namespace std; 4 int main() 5 { 6 Matrix M1(3); Matrix M2(3, 4); 7 const float a[9] = { 1,2,3,4,5,6,7,8,9 }; 8 const float b[12] = { 1,2,3,4,5,6,7,8,9,10,11,12 }; 9 M1.setMatrix(a); 10 M2.setMatrix(b); 11 Matrix M3 = M2; 12 cout << "M1为：" << endl; 13 M1.printMatrix(); 14 cout << "M2为：" << endl; 15 M2.printMatrix(); 16 cout << "M3为：" << endl; 17 M3.printMatrix(); 18 cout << "将M1矩阵第2行第2列换为100" << endl; 19 //system("pause"); 20 M1.setElement(2, 2, 100); 21 cout << "M1为：" << endl; 22 M1.printMatrix(); 23 cout << "M2矩阵第2行第2列值为：" << M2.element(2, 2) << endl; 24 return 0; 25 }
期中考试
1.已提交
2.用户管理
User.h
1 #include<iostream> 2 #include<string> 3 using namespace std; 4 class User { 5 public: 6 User(string s1); 7 User(string s1, string s2); 8 User(User &X); 9 void show(); 10 static void showCID(); 11 void changepassword(); 12 private: 13 string name; 14 int id; 15 static int CurrentID; 16 string password; 17 };
User.cpp
1 #include<iostream> 2 #include"user.h" 3 #include<string> 4 using namespace std; 5 int User::CurrentID = 999; 6 User::User(string s1){ 7 name = s1; 8 password = "111111"; 9 CurrentID++; 10 id = CurrentID; 11 } 12 User::User(string s1, string s2) :name(s1), password(s2) { 13 CurrentID++; 14 id = CurrentID; 15 } 16 User::User(User &X) : name(X.name), password(X.password) { 17 CurrentID++; 18 id = CurrentID; 19 } 20 void User::show() { 21 cout << "id：" << id << endl; 22 cout << "用户名：" << name << endl; 23 cout << "密码：" << password << endl; 24 } 25 void User::showCID() { 26 cout << "CurrentID:" << CurrentID << endl; 27 } 28 void User::changepassword() { 29 string p, np; 30 int j= 0; 31 while (1) { 32 cout << "请输入原有密码:"<<endl; 33 cin >> p; 34 if (p == password) { 35 cout << "请输入新密码:"; cin >> np; 36 password = np; break; 37 } 38 if (p != password) { 39 j++; cout << "输入原密码错误！" << endl; 40 } 41 if (j == 3) { 42 cout << "错误次数过多，请稍后再试" << endl; 43 break; 44 } 45 46 } 47 }
main.cpp
1 #include<iostream> 2 #include"user.h" 3 #include<string> 4 using namespace std; 5 6 int main() { 7 User u1("user1", "123456"); 8 User u2("user2"); 9 User u3("user3", "234567"); 10 u1.show(); u2.show(); u3.show(); User u(u3); u3.showCID(); 11 cout << "用户1换密码" << endl; 12 u1.changepassword(); 13 u1.show(); 14 cout << "用户2换密码" << endl; 15 u2.changepassword(); 16 return 0; 17 }
3.图书入库
book.h
1 #include <string> 2 using std::string; 3 4 class Book { 5 public: 6 Book(string isbnX, string titleX, float priceX); //构造函数 7 void print(); // 打印图书信息 8 private: 9 string isbn; 10 string title; 11 float price; 12 };
book.cpp
1 #include "book.h" 2 #include <iostream> 3 #include <string> 4 using namespace std; 5 6 // 构造函数 7 Book::Book(string isbnX, string titleX, float priceX) :isbn(isbnX), title(titleX), price(priceX) { 8 } 9 10 11 // 打印图书信息 12 void Book::print() { 13 cout << "出版编号:" << isbn << endl; 14 cout << "书名:" << title << endl; 15 cout << "价格:" << price << endl; 16 }
main.cpp
1 #include "book.h" 2 #include <vector> 3 #include <iostream> 4 using namespace std; 5 6 int main() 7 { 8 // 定义一个vector<Book>类对象 9 vector<Book> b1; 10 11 string isbn, title; 12 float price; 13 char quit; 14 // 录入图书信息，构造图书对象，并添加到前面定义的vector<Book>类对象中 15 while (1) { 16 cout << "输入信息：" << endl; 17 cin >> isbn >> title >> price; 18 Book a(isbn, title, price); 19 b1.push_back(a); 20 cout << "是否退出，退出输入“Z”" << endl; 21 cin >> quit; 22 if (quit == 'Z') 23 { 24 int i; 25 for (i = 0; i < b1.size(); i++) 26 { 27 b1[i].print(); 28 } 29 return 0; 30 } 31 } 32 33 34 // 输出入库所有图书信息 35 36 }
体会
会的太少，太丢人了