实验3 类和对象Ⅱ

实验任务4:

Vector_int.hpp:

#ifndef VECTOR_INT_HPP
#define VECTOR_INT_HPP

#include<iostream>

using namespace std;

class Vector_int{
    public:
        Vector_int(int n);
        Vector_int(int n, int value);
        Vector_int(const Vector_int &vector_int);
        ~Vector_int();
        int &at(int index);
        void show();
    private:
        int size;
        int *p;
};

Vector_int::Vector_int(int n):size(n){
    p = new int[size];
    for(int i=0; i<size; i++){
        p[i] = 0;
    }
}

Vector_int::Vector_int(int n, int value):size(n){
    p = new int[size];
    for(int i=0; i<size; i++){
        p[i] = value;
    }
}

Vector_int::Vector_int(const Vector_int &vector_int):size(vector_int.size){
    p = new int[size];
    for(int i=0; i<size; i++){
        p[i] = vector_int.p[i];
    }
}

Vector_int::~Vector_int(){
    delete[] p;
}

int &Vector_int::at(int index){
    if(index>=0&&index<size){
        return p[index];
    }
}

void Vector_int::show(){
    for(int i=0; i<size; i++){
        cout << p[i] << "\t";
    }
    cout << endl;
}

#endif 

task4.cpp:

#include<iostream>
#include "Vector_int.hpp"

int main(){
    using namespace std;
    int n,value;
    cout << "请输入数组大小n:";
    cin >> n;
    cout << "请输入数组初始化特定值value:";
    cin >> value;
    cout << endl;
    cout << "分别创建数组对象x1,x2,x3如下所示" << endl;
    cout << endl; 
    Vector_int x1(n);
    Vector_int x2(n,value);
    Vector_int x3(x2);
    x3.at(0) = 999;
    cout << "数组对象x1为:" << endl;
    x1.show();
    cout << endl;
    cout << "数组对象x2为:" << endl;
    x2.show();
    cout << endl;
    cout << "数组对象x3为:" << endl;
    x3.show(); 
    cout << endl;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
}

运行测试结果:

 

实验任务5:

Matrix.hpp:

#ifndef MATRIX_H
#define MATRIX_H

#include <iostream>
#include <cassert>

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
};


// 类Matrix的实现：待补足
Matrix::Matrix(int n):lines(n),cols(n){
    p = new double[lines*cols];
    for(int i=0; i<lines*cols; i++){
        p[i] = 0;
    }
}

Matrix::Matrix(int n, int m):lines(n),cols(m){
    p = new double[lines*cols];
    for(int i=0; i<lines*cols; i++){
        p[i] = 0;
    }
}

Matrix::Matrix(const Matrix &X):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(){
    delete[] p;
}

void Matrix::set(const double *pvalue){
    for(int i=0; i<lines*cols; i++){
        p[i] = *pvalue++;
    }
}

void Matrix::set(int i, int j, int value){
    p[i*cols+j] = value;
}

double &Matrix::at(int i, int j){
    return p[i*cols+j];
}

double Matrix::at(int i, int j) const {
    return p[i*cols+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++){
        if(i%cols == (cols-1)){
            cout << p[i] << endl;
        }
        else{
            cout << p[i] << ", ";
        }
    }
}

#endif

task5.cpp:

#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;
    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);
    m3.set(0, 0, 999);
    m3.print();
}

运行测试结果: