#include<iostream>
using namespace std;

class Matrix
{
private:
    int *m;
    int row;
    int col;
public:
    Matrix();
    Matrix(int r,int c);
    Matrix operator + (Matrix &m1);
    Matrix operator - (Matrix &m1);
    Matrix operator * (Matrix &m1);
    //Matrix & operator = (Matrix &m1);
    //Matrix & operator += (Matrix &m1);
    void print();
   
};

Matrix::Matrix()
{
}

Matrix::Matrix(int r,int c)
{
    row=r;
    col=c;
    m=new int[row*col];
    int i;
    for(i=0;i<row*col;i++)
        m[i]=i;
}
   
Matrix Matrix::operator + (Matrix &m1)
{   
    Matrix matrix;
    int i,j;
    int rowmin=(row<=m1.row?row:m1.row);
    int colmin=(col<=m1.col?col:m1.col);
    matrix.row =rowmin;
    matrix.col = colmin;
    matrix.m =  new int[rowmin*colmin];
    for(i=0;i<rowmin;i++)
        for(j=0;j<colmin;j++)
            matrix.m[i*colmin+j]=m[i*col+j]+m1.m[i*m1.col+j];
    return matrix;
}

Matrix Matrix::operator - (Matrix &m1)
{
    Matrix matrix;
    int i,j;
    int rowmin=(row<=m1.row?row:m1.row);
    int colmin=(col<=m1.col?col:m1.col);
    matrix.row = rowmin;
    matrix.col = colmin;
    matrix.m = new int[rowmin*colmin];
    //Matrix matrix(rowmin,colmin);
    for(i=0;i<rowmin;i++)
        for(j=0;j<colmin;j++)
            matrix.m[i*colmin+j]=m[i*col+j]-m1.m[i*m1.col+j];
    return matrix;
}

Matrix Matrix::operator * (Matrix &b)
{   
    Matrix c;
    if(col != b.row){
        cout<<"不能相乘!"<<endl;
        exit(0);
    }
    c.row = row;
    c.col =b.col;
    c.m = new int[row*b.col];
   
    int i,j,k;
    for(i=0;i<row;i++)
   
        for(j=0;j<b.col;j++)
        {
                c.m[i*b.col+j]=0;
                for(k=0;k<b.col;k++)
                c.m[i*b.col+j]+=(m[i*col+k])*(b.m[k*b.col+j]);//方阵的乘法结果正确，但是不是方阵结果不对！！
        }
        return c;
}
/*
Matrix & Matrix::operator = (Matrix &m1)
{
   
    int i,j;
    for(i=0;i<m1.row;i++)
        for(j=0;j<m1.col;j++)
            m[i*col+j]=m1.m[i*col+j];
    return *this;
}
   
Matrix & Matrix::operator += (Matrix &m1)
{
    int i,j;
    for(i=0;i<m1.row;i++)
        for(j=0;j<m1.col;j++)
            m[i*col+j]=m[i*col+j]+m1.m[i*col+j];
    return *this;
}
*/
void Matrix::print()
{
    int i,j;
    for(i=0;i<row;i++)
    {
        for(j=0;j<col;j++)
            cout<<m[i*col+j]<<"\t";
        cout<<endl;
    }
}

//#include<iostream>
//#include"head.h"
//using namespace std;

int main()
{
   
    Matrix A1(3,2),A2(2,3),A3,A4,A5;
    A3=A1+A2;
    A4=A1-A2;
    //A5=A1*A2;
   
    cout<<"A1="<<endl;
    A1.print();
    cout<<"A2="<<endl;
    A2.print();
    cout<<"A3="<<endl;
    A3.print();
    cout<<"A4="<<endl;
    A4.print();
    cout<<"A5="<<endl;
    A5=A1*A2;
    A5.print();
    //Matrix A6(3,2);
    //A6=A1;
    //cout<<"A6="<<endl;
    //A6.print();
    //A2+=A1;
    //cout<<"A2="<<endl;
    //A2.print();
    return 0;
}
加减运算没有问题，乘法运算有问题！！！