实验任务4
vector_int.hpp
#ifndef VECTOR_HPP #define VECTOR_HPP #include<iostream> #include<cassert> using namespace std; class Vector_int { public: Vector_int(int x); Vector_int(int x, int y); Vector_int(const Vector_int& test); ~Vector_int(); int& at(int num); private: int size; int* p; }; Vector_int::Vector_int(int x) :size(x)//一参数初始化 { cout << "dynamic create arry..." << endl; p = new int[x]; for (auto i = 0; i < size; i++) { p[i] = 0; } } Vector_int::Vector_int(int x, int y) :size(x)//二参数初始化 { cout << "dynamic create arry..." << endl; p = new int[x]; for (auto i = 0; i < size; i++) { p[i] = y; } } Vector_int::Vector_int(const Vector_int& test) :size(test.size)//深拷贝复制构造函数 { p = new int[size]; for (auto i = 0; i < size; i++) { p[i] = test.p[i]; } } Vector_int::~Vector_int()//析构函数 { cout << "deleting..." << endl; delete[] p; } int& Vector_int::at(int num) { assert(num >= 0 && num < size); return p[num]; } #endif
源文件
#include<iostream> #include"Vector_int.hpp" using namespace std; int main() { int a; cin >> a; Vector_int x(a); for (auto i = 0; i < a; i++) { cout << x.at(i); } cout << endl; Vector_int y(a, 8); for (auto i = 0; i < a; i++) { cout << y.at(i); } cout << endl; Vector_int z(y); for (auto i = 0; i < a; i++) { cout << z.at(i); } cout << endl; z.at(0) = 2333; cout << z.at(0) << endl; return 0; }
结果
实验任务5
头文件
#ifndef MATRIX_H #define MATRIX_H #include <iostream> using namespace std; class Matrix { public: Matrix(int n); // 构造函数,构造一个n*n的矩阵 Matrix(int n, int m); // 构造函数,构造一个n*m的矩阵 Matrix(const Matrix& X); // 复制构造函数,使用已有的矩阵X构造 ~Matrix(); //析构函数 void set(const double* pvalue); // 用pvalue指向的连续内存块数据按行为矩阵赋值 void set(int i, int j, int value); //设置矩阵第i行第j列元素值为value double& at(int i, int j); //返回矩阵第i行第j列元素的引用 double at(int i, int j) const; // 返回矩阵第i行第j列元素的值 int get_lines() const; //返回矩阵行数 int get_cols() const; //返回矩列数 void print() const; // 按行打印输出矩阵 private: int lines; // 矩阵行数 int cols; // 矩阵列数 double* p; // 指向存放矩阵数据的内存块的首地址 }; Matrix::Matrix(int n)//一个参数构造函数 { lines = cols = n; p = new double[n * n]; } Matrix::Matrix(int n, int m)//两个参数构造参数 { lines = n; cols = m; p = new double[n * m]; } Matrix::Matrix(const Matrix& x)//复制构造函数 { lines = x.lines; cols = x.cols; p = new double[lines * cols]; for (int i = 0; i < lines * cols; i++) { p[i] = x.p[i]; } } Matrix::~Matrix()//析构函数 { delete[] p; } void Matrix::set(const double* pvalue) { for (int i = 0; i < lines * cols; i++) { if (pvalue == NULL) { break; } p[i] = pvalue[i]; } } void Matrix::set(int i, int j, int value) { p[i * lines + j] = value; } double& Matrix::at(int i, int j) { double& res = p[i * lines + j]; return res; } double Matrix::at(int i, int j) const { return p[i * lines + j]; } int Matrix::get_lines() const { return lines; } int Matrix::get_cols() const { return cols; } void Matrix::print() const { for (int i = 0; i < lines * cols; i++) { cout << p[i]; if ((i + 1) % cols == 0) { cout << endl; } else cout << ", "; } } #endif
源文件
#include <iostream> #include "Matrix.hpp" int main() { using namespace std; double x[] = { 1, 2, 3, 4, 5, 6 }; Matrix m1(3, 2); // 创建一个3×2的矩阵 m1.set(x); // 用一维数组x的值按行为矩阵m1赋值 m1.print(); // 打印矩阵m1的值 cout << "the first line is: " << endl; cout << m1.at(0, 0) << " " << m1.at(0, 1) << endl; // 输出矩阵m1第1行两个元素的值 cout << endl; Matrix m2(2, 3); m2.set(x); m2.print(); cout << "the first line is: " << endl; cout << m2.at(0, 0) << " " << m2.at(0, 1) << " " << m2.at(0, 2) << endl; cout << endl; Matrix m3(m2); // 用矩阵m2构造新的矩阵m3 m3.set(0, 0, 999); // 将矩阵m3第0行第0列元素值设为999 m3.print(); }
实验结果