# 实验四 类与数组、指针

vectorInt:

#pragma once

#include<iostream>
#include<cassert>
using namespace std;

class VectorInt{
public:
VectorInt(int s);
VectorInt(int s,int value);
VectorInt(const VectorInt &v);
~VectorInt()  {delete[]p; cout << "析构函数调用" << endl;}

int& at(int i);
int get_size() const {return size;}
friend void output(VectorInt &v);
private:
int size,*p;

};

VectorInt::VectorInt(int s):size{s}
{
p=new int[size];
cout << "默认构造函数调用" << endl;
}

VectorInt::VectorInt(int s,int value):size{s}
{
p=new int[size];
for(int i=0;i<size;i++)
p[i]=value;
cout << "构造函数调用" << endl;
}

VectorInt::VectorInt(const VectorInt &v):size{v.size}
{
p=new int[size];
for(int i=0;i<size;i++)
p[i]=v.p[i];
cout << "复制构造函数调用" << endl;
}

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

void output(VectorInt &v)
{
for(int i=0;i<v.size;i++)
cout << v.p[i] << " ";
cout << endl;
}

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

void test() {
using namespace std;

int n;
cin >> n;

VectorInt x1(n);
for(auto i = 0; i < n; ++i)
x1.at(i) = i*i;

output(x1);

VectorInt x2(n, 42);
VectorInt x3(x2);

output(x2);
output(x3);

x2.at(0) = 77;

output(x2);
output(x3);
}

int main() {
test();
}

Matrix.hpp:

#pragma once

#include<iostream>
using namespace std;

class Matrix{

public:
Matrix(int n);
Matrix(int n, int m);
Matrix(const Matrix &X);
~Matrix()  {delete []p;}

void set(const double *pvalue);
void set(int i, int j, int value) { p[i*cols+j]=value; }
double &at(int i, int j)  { return p[i*cols+j]; }
double at(int i, int j) const  { return p[i*cols+j]; }
int get_lines() const  { return lines; }
int get_cols() const { return cols; }
void print() const;

private:
int lines,cols;
double *p;

};

Matrix::Matrix(int n):lines{n},cols{n}
{
p=new double[lines*cols];
cout << "默认构造函数调用" << endl;
}

Matrix::Matrix(int n,int m):lines{n},cols{m}
{
p=new double[lines*cols];
cout << "构造函数调用" << endl;
}

Matrix::Matrix(const Matrix &X):lines{X.lines},cols{X.cols}
{
p=new double[lines*cols];
for(auto i=0;i<lines*cols;i++)
p[i]=X.p[i];
cout << "复制构造函数调用" << endl;
}

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

void Matrix::print() const
{
for(auto i=0;i<lines;i++)
{
for(auto j=0;j<cols;j++)
cout << p[i*cols+j] << " ";
cout << endl;
}
}

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

void test() {
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();
}

int main() {
test();
}

posted @ 2022-11-08 23:28  lovessr  阅读(6)  评论(0编辑  收藏  举报