实验3 类和对象||

task4.cpp源码

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

using namespace std;

int main(){
    Vector_int x(5);
    cout<<"x(0)="<<x.at(0)<<endl;
    Vector_int x1(5,6);
    cout<<"x1(0)="<<x1.at(0)<<endl;
    Vector_int y(x1);
    cout<<"y(3)="<<y.at(3)<<endl;
    
}

vector_int.hpp源码

#ifndef Vector_int_H
#define Vector_int_H

#include<iostream>

using namespace std;

class Vector_int{
    public:
    Vector_int(int n);
    Vector_int(int n,int num0);
    Vector_int(const Vector_int &x);
    ~Vector_int();
    int &at(int index);
    private:
    int size;
    int num;
    int *p;
};

Vector_int::Vector_int(int n):size(n){
    cout<<"dynamic create array..."<<endl;
    p=new int[size];
    for(int i=0;i<size;i++) p[i]=0;
}

Vector_int::Vector_int(int n,int num0):size(n),num(num0){
    cout<<"dynamic create array..."<<endl;
    p=new int[size];
    for(int i=0;i<size;i++) p[i]=num;
}

Vector_int::Vector_int(const Vector_int &x):size(x.size){
    cout<<"d-copy create array..."<<endl;
    p=new int[size];
    for(int i=0;i<size;i++) p[i]=x.num;
}

Vector_int::~Vector_int(){
    cout<<"deleting..."<<endl;
    delete[] p;
}

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

#endif

task4测试结果截图：

 

 

 task5.cpp源码

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

int main(){
    using namespace std;

    double x[]={1,2,3,4,5,6};

    Matrix m1(3,2);
    m1.set(x);
    m1.print();
    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();
}

Matrix.hpp源码

#ifndef MATRIX_H
#define MATRIX_H

#include<iostream>

using namespace std;

class Matrix{
    public:
    Matrix(int n);
    Matrix(int n,int m);
    Matrix(const Matrix &X);
    ~Matrix();
    void set(const double *pvalue);
    void set(int i, int j , int value);
    double &at(int i, int j);
    double at(int i , int j) const;
    int get_lines() const;
    int get_cols() const;
    void print() const;
    private:
    int lines;
    int cols;
    double *p;
};

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

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

Matrix::Matrix(const Matrix &X):lines(X.lines),cols(X.cols){
    p=new double[lines*cols];
    for(int i=0;i<lines;i++){
       for(int j=0;j<cols;j++) p[i*cols+j]=X.p[i*cols+j];
    }
}

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

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

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;i++){
        for(int j=0;j<cols;j++){
            cout<<p[i*cols+j]<<",";
        }
    cout<<"\n";
    }
}
#endif

task5原实验结果截图

 

 task5.cpp修改实验数据后的源码

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

int main(){
    using namespace std;

    double x[]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};

    Matrix m1(3,5);
    m1.set(x);
    m1.print();
    cout<<"the first line is:"<<endl;
    cout<<m1.at(0,0)<<" "<<m1.at(0,1)<<" "<<m1.at(0,2)<<" "<<m1.at(0,3)<<" "<<m1.at(0,4)<<endl;
    cout<<endl;

    Matrix m2(5,3);
    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();
}

task5修改后的实验结果截图：