新手求解-为什么我写的这段矩阵计算的程序里，只要是new分配的内存都指向同一段内存啊
new 错误 matrix 内存
#ifndef MATRIX_H_INCLUDED
#define MATRIX_H_INCLUDED
#include <iostream>
using std::cin;
using std::cout;
using std::cerr;
using std::endl;
using std::istream;
using std::ostream;
#include <cstdlib>
using std::exit;
class matrix
{
friend ostream& operator<<( ostream&, const matrix);
friend istream& operator>>( istream&, const matrix&);
friend const bool operator==( const matrix matrix_1, const matrix matrix_2);
friend const bool operator!=( const matrix matrix_1, const matrix matrix_2);
friend const matrix operator+( const matrix& add_matrix_1, const matrix& add_matrix_2);
friend const matrix operator-( const matrix minused_matrix, const matrix minusing_matrix);
friend const matrix operator*( const matrix multiplied_matrix, const matrix multiplying_matrix);
public:
matrix();
matrix( int, int);
~matrix();
void set_rNc( int, int);
const int get_size();
const matrix& operator+=( const matrix adding_matrix);
const matrix& operator=( const matrix target_matrix);
private:
int row;
int column;
int* num;
};
#include "matrix.h"
matrix::matrix()
{
row = 0;
column = 0;
num = NULL;
}
matrix::matrix( int input_row, int input_column)
{
row = input_row;
column = input_column;
num = new int[row*column];
}
matrix::~matrix()
{
delete[] num;
}
void matrix::set_rNc( int input_row, int input_column)
{
row = input_row;
column = input_column;
delete[] num;
this -> num = new int[row*column];
}
const int matrix::get_size()
{
return row*column;
}
const matrix& matrix::operator+=( const matrix adding_matrix)
{
for( int i=0; i<get_size(); i++) num[i] += adding_matrix.num[i];
return *this;
}
const matrix& matrix::operator=( const matrix target_matrix)
{
row = target_matrix.row;
column = target_matrix.column;
delete[] num;
num = new int[row*column];
for( int i=0; i<get_size(); i++) num[i] = target_matrix.num[i];
return *this;
}
const bool operator==( const matrix matrix_1, const matrix matrix_2)
{
if( matrix_1.row!=matrix_2.row|| matrix_1.column!=matrix_2.column) return false;
else
{
for( int i=0; i<matrix_1.row*matrix_1.column; i++) if( matrix_1.num[i]!=matrix_2.num[i]) return false;
return true;
}
}
const bool operator!=( const matrix matrix_1, const matrix matrix_2)
{
return !( matrix_1==matrix_2);
}
const matrix operator+( const matrix& add_matrix_1, const matrix& add_matrix_2)
{
if( add_matrix_1.row==add_matrix_2.row&& add_matrix_1.column==add_matrix_2.column)
{
matrix result_matrix;
result_matrix.num = new int[add_matrix_1.row*add_matrix_1.column];
for( int i=0; i<add_matrix_1.row*add_matrix_1.column; i++)
result_matrix.num[i] = add_matrix_1.num[i] + add_matrix_2.num[i];
return result_matrix;
}
else
{
cout << "These two matrixes can not add with each other!" << endl;
exit(0);
}
}
const matrix operator-( const matrix minused_matrix, const matrix minusing_matrix)
{
if( minused_matrix.row== minusing_matrix.row&& minused_matrix.column== minusing_matrix.column)
{
matrix result_matrix;
result_matrix.num = new int[minused_matrix.row*minused_matrix.column];
for( int i=0; i<minused_matrix.row*minused_matrix.column; i++) result_matrix.num[i] = minused_matrix.num[i] - minusing_matrix.num[i];
return result_matrix;
}
else
{
cout << "These two matrixes can not minus with each other!" << endl;
exit(0);
}
}
const matrix operator*( const matrix multiplied_matrix, const matrix multiplying_matrix)
{
if( multiplied_matrix.column==multiplying_matrix.row)
{
int temp_num=0;
matrix result_matrix( multiplied_matrix.row, multiplying_matrix.column);
for( int temp_row=0; temp_row<result_matrix.row; temp_row++)
{
for( int temp_column=0; temp_column<result_matrix.column; temp_column++)
{
for( int temp_count=0; temp_count<multiplied_matrix.column; temp_count++)
temp_num += ( multiplied_matrix.num[temp_row*multiplied_matrix.column+temp_count]*multiplying_matrix.num[temp_count*multiplying_matrix.column+temp_column]);
result_matrix.num[temp_row*result_matrix.column+temp_column] = temp_num;
temp_num = 0;
}
}
return result_matrix;
}
else
{
cout << "These two matrixes can not multiply with each other!" << endl;
exit(0);
}
}
#include "matrix.h"
ostream& operator<<( ostream& output, const matrix output_matrix)
{
for( int i=0; i<output_matrix.row*output_matrix.column; i++)
{
output << output_matrix.num[i] << '\t';
if( (i+1)%output_matrix.column==0) output << '\n';
}
return output;
}
istream& operator>>( istream& input, const matrix& input_matrix)
{
for( int i=0; i<input_matrix.row*input_matrix.column; i++) input >> input_matrix.num[i];
return input;
}
#include "matrix.h"
int main()
{
cout << "Hello world!" << endl;
int row=0,column=0;
cout << "Please input the row & column of the first matrix:" << endl;
cin >> row >> column;
matrix matrix_1( row, column);
row = 0;
column = 0;
cout << "Please input the number of this matrix:" << endl;
cin >> matrix_1;
cout << "Print the matrix:" << endl;
cout << matrix_1;
cout << "Please input the row & column of the second matrix:" << endl;
cin >> row >> column;
matrix matrix_2( row, column);
row = 0;
column = 0;
cout << "Please input the number of this matrix:" << endl;
cin >> matrix_2;
cout << "Print the matrix:" << endl;
cout << matrix_2;
matrix matrix_3;
matrix_3 = matrix_1 + matrix_2;
cout << "Print the matrix of the sum of the first & second:" << endl;
cout << matrix_3;
return 0;
}
