实验三 类和对象Ⅱ
任务四：
//vector_int.hpp
1 #ifndef BALL_H 2 #define BALL_H 3 4 #include<iostream> 5 #include<cstdlib> 6 7 using namespace std; 8 9 class Vector_int{ 10 private: 11 int n, m; 12 int * p; 13 public: 14 Vector_int(int n0); 15 Vector_int(int n0, int m0); 16 Vector_int(Vector_int & x); 17 ~Vector_int(); 18 int & at(int i); 19 void print(){ 20 for(int i=0; i<n; i++) 21 cout << p[i] << " "; 22 cout << endl; 23 } 24 }; 25 26 Vector_int::Vector_int(int n0){ 27 p = new int [n0]; 28 n = n0; 29 for(int i=0; i<n0; i++) 30 p[i] = 0; 31 cout << "构造函数1被调用" << endl; 32 } 33 Vector_int::Vector_int(int n0, int m0){ 34 p = new int [n0]; 35 n = n0; 36 for(int i=0; i<n0; i++) 37 p[i] = m0; 38 cout << "构造函数2被调用" << endl; 39 } 40 Vector_int::Vector_int(Vector_int & x){ 41 n = x.n; 42 p = new int [n]; 43 for(int i=0; i<n; i++) 44 p[i] = x.p[i]; 45 cout << "复制构造函数被调用" << endl; 46 } 47 Vector_int::~Vector_int(){ 48 delete[] p; 49 cout << "析构函数被调用" << endl; 50 } 51 int & Vector_int::at(int i){ 52 return p[i]; 53 } 54 55 #endif
//task4.cpp
1 #include<iostream> 2 #include"vector_int.hpp" 3 4 using namespace std; 5 6 int main(){ 7 int n; 8 cin >> n; 9 Vector_int x(n); 10 x.print(); 11 Vector_int y(n, 6); 12 y.print(); 13 Vector_int z(x); 14 z.at(0) = 999; 15 z.print(); 16 }
运行结果截图：
任务五：
//Matrix.hpp
1 #ifndef MATRIX_H 2 #define MATRIX_H 3 4 #include<iostream> 5 using std::cout; 6 using std::endl; 7 class Matrix{ 8 public: 9 Matrix(int n); 10 Matrix(int n, int m); 11 Matrix(const Matrix &X); 12 ~Matrix(); 13 void set(const double * pvalue); 14 void set(int i, int j, int value); 15 double & at(int i, int j); 16 double at(int i, int j)const; 17 int get_lines() const; 18 int get_cols() const; 19 void print() const; 20 private: 21 int lines; 22 int cols; 23 double *p; 24 }; 25 26 Matrix::Matrix(int n){ 27 lines = n; 28 cols = n; 29 p = new double [n*n]; 30 } 31 32 Matrix::Matrix(int n, int m){ 33 lines = n; 34 cols = m; 35 p = new double [n*m]; 36 } 37 Matrix::Matrix(const Matrix &X){ 38 lines = X.lines; 39 cols = X.cols; 40 p = new double [X.lines*X.cols]; 41 for(int i=0; i<lines*cols; i++) 42 p[i] = X.p[i]; 43 } 44 Matrix::~Matrix(){ 45 delete[] p; 46 } 47 void Matrix::set(const double * pvalue){ 48 for(int i=0; i<lines*cols; i++) 49 p[i] = pvalue[i]; 50 } 51 void Matrix::set(int i, int j, int value){ 52 p[cols * i + j] = value; 53 } 54 double & Matrix::at(int i, int j){ 55 return p[cols * i + j]; 56 } 57 double Matrix::at(int i, int j)const{ 58 return p[cols * i + j]; 59 } 60 int Matrix::get_lines() const{ 61 return lines; 62 } 63 int Matrix::get_cols() const{ 64 return cols; 65 } 66 void Matrix::print() const{ 67 for(int i=0; i<cols*lines; i++){ 68 cout << p[i] << ", "; 69 if(!((i+1)%cols)) 70 cout << "\b\b \n"; 71 } 72 } 73 #endif
//task5.cpp
1 #include<iostream> 2 #include"Matrix.hpp" 3 4 int main(){ 5 using namespace std; 6 7 double x[] = {1, 2, 3, 4, 5, 6}; 8 9 Matrix m1(3, 2); 10 m1.set(x); 11 m1.print(); 12 cout << "the first line is: " << endl; 13 cout << m1.at(0, 0) << " " << m1.at(0, 1) << endl; 14 cout << endl; 15 16 Matrix m2(2, 3); 17 m2.set(x); 18 m2.print(); 19 cout << "the first line is: " << endl; 20 cout << m2.at(0, 0) << " " << m2.at(0 , 1) << " " << m2.at(0, 2) << endl; 21 cout << endl; 22 23 Matrix m3(m2); 24 m3.set(0, 0, 999); 25 m3.print(); 26 }
运行结果截图：
