shiyan11.cpp

学习c++的一些实例程序

#include  "iostream.h"
#include "stdlib.h"
class Matrix
{
	friend Matrix Rotate(Matrix &m);
public:
	int **pMatrix;
	 int iMaxx,iMaxy;
	static int ObjectAliveNo;
public:
	Matrix(unsigned int x ,unsigned int y);
	Matrix(Matrix &m);
	~Matrix();
	bool SetValue( int x , int y ,int value);
	void Input();
	void Print() const;
	Matrix operator*(Matrix &m);
	Matrix operator=(Matrix &m);
};
int Matrix::ObjectAliveNo=0;
Matrix::Matrix(unsigned int x,unsigned int y)
{
	pMatrix=new int *[x];
	if(! pMatrix)
	{
		cerr<<"\n Matrix constructor error!\n";
		exit(0);
	}
	for(unsigned int i=0;i<x;i++)
	{
		pMatrix[i]=new int[y];
	}
	iMaxx=x;
	iMaxy=y;
	ObjectAliveNo++;
}
Matrix::Matrix(Matrix & m)
{
	iMaxx=m.iMaxx;
	iMaxy=m.iMaxy;
	pMatrix=new int*[iMaxx];
	if(!pMatrix)
	{
		cerr<<"\n Matrix constructing error!\n";
		exit(0);
	}
	for(int i=0;i<iMaxx;i++)
	{
		pMatrix[i]=new int[iMaxy];
	}
	int j;
	for(i=0;i<iMaxx;i++)
		for(j=0;j<iMaxy;j++)
			pMatrix[i][j]=m.pMatrix[i][j];
	ObjectAliveNo++;
}
Matrix Matrix::operator =(Matrix &m)
{
	for(int i=0;i<iMaxx;i++)
		delete[]pMatrix[i];
	delete[]pMatrix;
	iMaxx=m.iMaxx;
	iMaxy=m.iMaxy;
	pMatrix=new int *[iMaxx];
	if(!pMatrix)
	{
		cerr<<"\n Matrix constructing error!\n";
		exit(0);
	}
	for(i=0;i<iMaxx;i++)
	{
		pMatrix[i]=new int[iMaxy];
	}
	int j;
	for(i=0;i<iMaxx;i++)
		for(j=0;j<iMaxy;j++)
			pMatrix[i][j]=m.pMatrix[i][j];
	ObjectAliveNo++;
	return *this;
}
Matrix::~Matrix()
{
	for(int i=0;i<iMaxx;i++)
		delete[]pMatrix[i];
	delete[]pMatrix;
	ObjectAliveNo--;
}
bool Matrix::SetValue( int x, int y,int value)
{
	if((x>=iMaxx)||(y>=iMaxy))
	{
		cerr<<"\n Invalid(x,y):"<<x<<','<<y<<'\n';
		return false;
	}
	else
	{
		pMatrix[x][y]=value;
		return true;
	}
}
void Matrix::Input()
{
	int ix,iy,value;
	for(ix=0;ix<iMaxx;ix++)
		for(iy=0;iy<iMaxy;iy++)
		{
			cin>>value;
			SetValue(ix,iy,value);
		}
}
void Matrix::Print()const
{
	int ix,iy;
	cout<<"\n Sun of Matrix object(s)="<<ObjectAliveNo;
	cout<<"\n Matrix("<<iMaxx<<','<<iMaxy<<")is";
	for(ix=0;ix<iMaxx;ix++)
	{
		cout<<'\n';
		for(iy=0;iy<iMaxy;iy++)
			cout<<pMatrix[ix][iy]<<' ';
	}
}
Matrix Matrix::operator *(Matrix & m)
{
	if(iMaxy!=m.iMaxx)
	{
		cerr<<"\n Cannot multiply Matrix a with b!\n";
		return * this;
	}
	int ix,iy,iz;
	Matrix c(iMaxx,m.iMaxy);
	for(ix=0;ix<iMaxx;ix++)
		for(iy=0;iy<m.iMaxy;iy++)
		{
			c.pMatrix[ix][iy]=0;
			for(iz=0;iz<iMaxy;iz++)
			{
				c.pMatrix[ix][iy]+=pMatrix[ix][iz]*m.pMatrix[iz][iy];
			}
		}
		return c;
}
Matrix Rotate(Matrix & m)
{
	 int i,j;
	Matrix mr(m.iMaxy,m.iMaxx);
	for(i=0;i<m.iMaxx;i++)
		for(j=0;j<m.iMaxy;j++)
			mr.pMatrix[j][i]=m.pMatrix[i][j];
	return mr;
}
Matrix Mul(Matrix a,Matrix b)
{
	if(a.iMaxy!=b.iMaxx)
	{
		cerr<<"\n Cannot multiply Matrix a with b!\n";
		return a;
	}
	int ix,iy,iz;
	Matrix c(a.iMaxx,b.iMaxy);
	for(ix=0;ix<a.iMaxx;ix++)
		for(iy=0;iy<b.iMaxy;iy++)
		{
			c.pMatrix[ix][iy]=0;
			for(iz=0;iz<a.iMaxy;iz++)
			{
				c.pMatrix[ix][iy]+=a.pMatrix[ix][iy]*b.pMatrix[iz][iy];
			}
		}
		return c;
}
Matrix Mul(Matrix *pa,Matrix *pb)
{
	if(!pa||!pb)
	{
		cerr<<"\n Invalid Matrix a or b!\n";
		exit(1);
	}
    if(pa->iMaxy!=pb->iMaxx)
	{
		cerr<<"\n Cannot multiply Matrix a with b! \n";
		exit(1);
	}
	int ix,iy,iz;
	Matrix c(pa->iMaxx,pb->iMaxy);
	for(ix=0;ix<pa->iMaxx;ix++)
		for(iy=0;iy<pa->iMaxy;iy++)
		{
			c.pMatrix[ix][iy]=0;
			for(iz=0;iz<pa->iMaxy;iz++)
			{
				c.pMatrix[ix][iy]+=pa->pMatrix[ix][iz]*pb->pMatrix[iz][iy];
			}
		}
	return c;
}
Matrix Mul(Matrix &a,Matrix &b)
{
	if(a.iMaxx!=b.iMaxy)
	{
		cerr<<"\n Cannot multiply Matrix a with b! \n";
		return a;
	}
	int ix,iy,iz;
	Matrix c(a.iMaxx,b.iMaxy);
	for(ix=0;ix<a.iMaxx;ix++)
		for(iy=0;iy<b.iMaxy;iy++)
		{
			c.pMatrix[ix][iy]=0;
			for(iz=0;iz<a.iMaxy;iz++)
			{
				c.pMatrix[ix][iy]+=a.pMatrix[ix][iz]*b.pMatrix[iz][iy];
			}
		}
	return c;
}
int main()
{
	Matrix a(2,2);
	cout<<"Input Matrix a[2][2]:\n";
	a.Input();
	a.Print();
	Matrix b(2,3);
	cout<<"\n Input matrix b[2][3]:\n";
	b.Input();
	b.Print();

//用以下三种矩阵乘积的函数分别测试时，
//需要测试何种方式，只需将相应的注释代码去掉即可。
/*
    //测试矩阵的乘积（传值方式）
Matrix Mul(Matrix a,Matrix b);
cout<<"\n 传值方式Multiply Matrix a with b:";
Matrix c =Mul(a,b);
c.Print();
*/
/*
     //测试矩阵的乘积（引用方式）
Matrix Mul(Matrix &a,Matrix &b);
cout<<"\n 引用方式Multiply Matrix a with b:";
Matrix d =Mul(a,b);
d.Print();
*/
/*
     //测试矩阵的乘积（传地址方式）
Matrix Mul(Matrix *pa,Matrix *pb);
cout<<"\n 传地址方式Multiply Matrix a with b:";
Matrix e =Mul(&a,&b);
e.Print();
*/
     //测试矩阵转置
    cout<<"\n Recerse of Matrix b[2][3]:";
    Matrix f=Rotate(b);
    f.Print();
    return 0;
}