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//
// main.cpp
// tpc 7-5 matrix
//
// Created by Wagner Pereira on 01/05/14.
// Copyright (c) 2014 Wagner Pereira. All rights reserved.
//
#include <iostream>
using namespace std;
//Matrix 类的定义
class Matrix
{
int ** matrix;
int line, column;
public:
Matrix(int l = 0, int c = 0);
void Input();
void Print();
~Matrix();
Matrix operator+ (const Matrix &obj1); //operator+ 的声明
Matrix operator- (const Matrix &obj1); //operator－ 的声明
Matrix operator* (const Matrix &obj1); //operator* 的声明
};
// Constructor function ------------------------------
Matrix::Matrix(int l, int c)
{
this->line = l;
this->column = c;
//根据矩阵的大小分配空间
matrix = new int*[this->line];
int i;
for(i=0; i<this->line; i++)
{
matrix[i] = new int[this->column];
}
//如果分配失败则抛出异常
if (!this->matrix)
throw 0;
}
//Input function --------------------------------------
void Matrix:: Input()
{
int l, c; //定义 l 表示行 和 c 表示列
static int count = 0;
cout <<"Fill the "<<++count<<"ª matrix: "<<endl;
//使用循环来输入矩阵的数据
for (l = 0; l < this->line; l++)
{
cout <<l+1<<"ª line: ";
for (c = 0; c < this->column; c++)
cin>>this->matrix[l][c];
}
cout<<endl;
}
//Print function --------------------------------------
void Matrix:: Print()
{
int l, c;
cout<<endl;
for (l = 0; l < this->line; l++)
{
for (c = 0; c < this->column; c++)
cout << this->matrix[l][c]<<"\t";
cout<<endl;
}
cout<<endl;
}
//Destructor function --------------------------------
Matrix::~Matrix()
{/*
int i;
for (i = 0; i <this->line; i++)
{
delete[] matrix[i];
}*/
delete [] matrix;
}
//Operator + -----------------------------------------
Matrix Matrix:: operator +(const Matrix &obj1)
{
//判断两个矩阵是否同型，如果不同型则两矩阵不能进行加法运算所以抛出异常
if (obj1.line == this->line && obj1.column == this->column)
{
int l, c;
Matrix temp(this->line,this->column);
for(l = 0; l < this->line; l++)
{
for(c = 0; c < this->column; c++)
temp.matrix[l][c] = this->matrix[l][c] + obj1.matrix[l][c];
}
return temp;
}
else
throw 1;
}
//Operator - -----------------------------------------
Matrix Matrix:: operator -(const Matrix &obj1)
{
//判断两个矩阵是否同型，如果不同型则两矩阵不能进行减法运算所以抛出异常
if (obj1.line == this->line && obj1.column == this->column)
{
int l, c;
Matrix temp(this->line,this->column);
for(l = 0; l < this->line; l++)
{
for(c = 0; c < this->column; c++)
temp.matrix[l][c] = this->matrix[l][c] - obj1.matrix[l][c];
}
return temp;
}
else
throw 2;
}
//Operator * ------------------------------------------
Matrix Matrix:: operator* (const Matrix &obj1)
{
//判断第一个矩阵的列是否等于第二个矩阵的行，如果相等则进行乘法，如不相等抛出异常
if(this->column == obj1.line)
{
Matrix temp(this->line,obj1.column);
int l,c,i;
for (l = 0; l < this->line; l++)
for (c = 0; c < this->line; c++)
for (i = 0; i < this->column; i++)
temp.matrix[l][c] += this->matrix[l][i] * obj1.matrix[i][c];
return temp;
}
else
throw 3;
}
int main()
{
try
{
Matrix m1(2,2);
Matrix m2(2,2);
Matrix m3(2,2);
m1.Input();
m2.Input();
m3 = m1*m2;
m3.Print();
m3 = m1 + m2;
m3.Print();
m3 = m3 - m1;
}
catch(int x)
{
switch(x)
{
case 0:
cout <<"Allocation failure"<<endl;
cout<<"Program finished"<<endl;
break;
case 1:
cout <<"The two matrices cannot be added!"<<endl;
cout<<"Program finished"<<endl;
break;
case 2:
cout <<"The two matrices cannot be added!"<<endl;
cout<<"Program finished"<<endl;
break;
case 3:
cout <<"The two matrices cannot be multiplied!"<<endl;
cout<<"Program finished"<<endl;
break;
}
}
return 0;
}
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