实验四

#include<iostream>
using namespace std;
class vectorint{
public:
    vectorint(int l=0){
        size=l;
        cout<<"constructor 1 called\n"<<endl;
        p=new int[size];
    }
    vectorint(int l,int value){
        cout << "constructor 2 called\n";
        size=l;
        p=new int[size]; 
        for(int i=0;i<l;i++){
            *(p+i)=value;
        }
    }
    vectorint(vectorint &x){
        cout << "copy constructor called\n";
        size=x.size;
        p=new int[size];
        for(int i=0;i<size;i++)
            *(p+i)=x.at(i);
    }
    ~vectorint(){
        cout<<"Destructor called."<<endl;
        delete []p;
    }
    int &at(int i){
        return *(p+i);
    }
    int get_size(){
        return size;
    }
    friend void output(vectorint &x){
        for(int i=0;i<x.size-1;i++)
            cout<<*(x.p+i)<<",";
        cout<<*(x.p+x.size-1)<<endl;
    } 
private:
    int size;
    int *p;
    
};
void test() {
    using namespace std;
    
    int n;
    cin >> n;
    vectorint x1(n);
    for(int 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();
}

 

 

#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];
}
Matrix::Matrix(int n, int m){
    lines=n;
    cols=m;
    p=new double[lines*cols];
}
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[i];
}
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-1; j ++)
           cout << p[i * cols + j] << ",";
        cout<<p[i*cols+cols-1]<<endl;
    }
}
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();
}