C++沉思录第九章的练习

先把代码贴着，明天再补充总结！

#ifndef PICTURE_H
#define PICTURE_H
#include<iostream>
using namespace std;

class Picture
{
private:
int height, width;
char * data;
char & position(int row, int col)
{
return data[row*width + col];
}
char position(int row, int col)const
{
return data[row*width + col];
}
static int max(int m, int n){ return m > n ? m : n; }
void init(int h, int w);
void copypic(int n, int m, const Picture & p);
void clear(int a, int b, int c, int d);
public:
Picture() :height(0), width(0), data(0){}
Picture(const char * const *, int);
Picture(const Picture &);
~Picture(){ delete[] data; }
Picture & operator =(const Picture &);

friend ostream & operator <<(ostream & os, const Picture & p);
friend Picture frame(const Picture & p);
friend Picture operator |(const Picture & p, const Picture & q);//横向连接
friend Picture operator &(const Picture & p, const Picture & q);//纵向连接
};
void Picture::init(int h, int w)
{
height = h;
width = w;
data = new char[w*h];
}
Picture::Picture(const char * const * arr, int m)
{
int w = 0;
int i;
for (i = 0; i < m; ++i)
w = Picture::max(m, strlen(arr[i]));
init(m, w);
for (i = 0; i < m; ++i)
{
const char * c = arr[i];
int len = strlen(arr[i]);
int j = 0;
while (j < len)
{
position(i, j) = c[j]; ++j;
}
while (j < width)
{
position(i, j) = ' ';
++j;
}
}
}
void Picture::copypic(int n, int m, const Picture & p)
{
for (int i = 0; i < p.height; ++i)
{
for (int j = 0; j < p.width; ++j)
position(n + i, m + j) = p.position(i, j);
}
}
Picture::Picture(const Picture & p)
:height(p.height), width(p.width), data(new char[p.height*p.width])
{
copypic(0, 0, p);
}
void Picture::clear(int a, int b, int c, int d)
{
for (int i = a; i < c;++i)
for (int j = b; j < d; ++j)
position(i, j) = ' ';
}
Picture & Picture::operator=(const Picture & p)
{
if (this != &p)
{
delete[]data;
init(p.height, p.width);
copypic(0, 0, p);
}
return *this;
}
ostream & operator <<(ostream & os, const Picture & p)
{
for (int i = 0; i < p.height; ++i)
{
for (int j = 0; j < p.width; ++j)
os << p.position(i, j);
os << endl;
}
return os;
}
Picture frame(const Picture & p)
{
Picture r;
r.init(p.height + 2, p.width + 2);
for (int i = 1; i <= r.width-1 ; ++i)
{
r.position(0,i) = '-';
r.position(r.height - 1,i ) = '-';
<pre>	}
for (int j = 1; j <=r.height-1; ++j)
{
r.position(j,0) = '|';
r.position(j,r.width-1) = '|';
}
r.position(0, 0) = '+';
r.position(0, r.width-1) = '+';
r.position(r.height - 1, 0) = '+';
r.position(r.height - 1, r.width - 1) = '+';
r.copypic(1, 1, p);
return r;
}
Picture operator |(const Picture & p, const Picture & q)//横向连接
{
Picture r;
r.init(Picture::max(p.height, q.height), p.width + q.width);
r.clear(p.height, 0, r.height, p.width);

r.clear(q.height,p.width, r.height, r.width);r.copypic(0, 0, p);r.copypic(0, p.width, q);return r;}Picture operator &(const Picture & p, const Picture & q)//纵向连接{Picture r;r.init(p.height+ q.height, Picture::max(p.width, q.width));r.clear(0,
p.width, p.height, r.width);r.clear(p.height, q.width, r.height, r.width);r.copypic(0, 0, p);r.copypic(p.height,0 ,q);return r;}#endif

#include"picture.h"

int main()
{
char * init[] = { "Summer", "love", "Xieweizhong" };
Picture p(init,3);
cout << p << endl;
cout << frame((p | frame(p)) | (p | frame(p))) << endl;
cout << frame((p & frame(p)) | (p | frame(p))) << endl;
cout << frame((p | frame(p)) | (p & frame(p))) << endl;
cout << frame((p & frame(p)) | (p & frame(p))) << endl;
cout << frame((p | frame(p)) & (p | frame(p))) << endl;
cout << frame((p & frame(p)) & (p | frame(p))) << endl;
cout << frame((p | frame(p)) & (p & frame(p))) << endl;
cout << frame((p & frame(p)) & (p & frame(p))) << endl;
return 0;
}