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标题: 请教一个运算符重载程序 [打印本页]

作者: love戒情人 时间: 2009-11-3 01:43
标题: 请教一个运算符重载程序
有点错误希望大家帮我找一找我们正在学这个呢谢谢大家了如果有逻辑错误的话请不要笑话我：
#include<iostream.h>
#include<iomanip.h>
class matrix
{
short rows,cols;
double *elems;
public:
matrix(){}
matrix(short r,short c);
double operator()(short r,short c);
void setelem(short r,short c,double v);
friend matrix operator+(matrix p,matrix q);
friend matrix operator-(matrix p,matrix q);
friend matrix operator*(matrix p,matrix q);
void print();
};
matrix::matrix(short r,short c)
{
rows=r;
cols=c;
elems=new double[r*c];
}
double matrix::operator ()(short r,short c)
{
return (r>=1&&r<=rows&&c>=1&&c<=cols)?elems[(r-1)*cols+(c-1)]:0.0;
}
void matrix::setelem(short r,short c,double v)
{
if(r>=1&&r<=rows&&c>=1&&c<=cols)
elems[(r-1)*cols+(c-1)]=v;
}
matrix operator+(matrix p,matrix q)
{
matrix m(p.rows,p.cols);
if(p.rows!=q.rows||p.cols!=q.cols)
{
cout<<"error";
}
for(int i=1;i<=p.rows;i++)
{
for(int j=1;j<=p.cols;j++)
{
m.setelem(i,j,p(i,j)+q(i,j));
}
}
return m;
}
matrix operator-(matrix p,matrix q)
{
matrix m(p.rows,p.cols);
if(p.rows!=q.rows||p.cols!=q.cols)
{
cout<<"error";
}
for(int i=1;i<=p.rows;i++)
{
for(int j=1;j<=p.cols;j++)
{
m.setelem(i,j,p(i,j)-q(i,j));
}
}
return m;
}
matrix operator*(matrix p,matrix q)
{
matrix m(p.rows,q.cols);
if(p.cols!=q.rows)
cout<<"error";
for(int i=1;i<=p.rows;i++)
{
for(int j=1;j<=q.cols;j++)
{
m.setelem(i,j,0.0);
for(int k=1;k<=p.cols;k++)
{
m.setelem(i,j,m(i,j)+p(i,k)+q(k,j));
}
return m;
}
void matrix::print()
{
for(int i=1;i<=rows;i++)
{
for(int j=1;j<=cols;j++)
{
cout<<setw(7)<<(*this)(i,j);
}
cout<<endl;
}
}
void main()
{
matrix a(2,3),b(2,3),c(3,2),d(2,3),e(2,2);
a.setelem(1,1,-1.1);
a.setelem(1,2,2.2);
a.setelem(1,3,-3.3);
a.setelem(2,1,4.4);
a.setelem(2,2,-5.5);
a.setelem(2,3,6.6);
cout<<"A:"<<endl;a.print();

作者: 龍2132 时间: 2009-11-3 01:43
以下是引用heliujin在2006-5-6 8:46:00的发言：
有点错误希望大家帮我找一找我们正在学这个呢谢谢大家了如果有逻辑错误的话请不要笑话我：
#include<iostream.h>
#include<iomanip.h>
class matrix
{
short rows,cols;
double *elems;
public:
matrix(){}
matrix(short r,short c);
double operator()(short r,short c);
void setelem(short r,short c,double v);
friend matrix operator+(matrix p,matrix q);
friend matrix operator-(matrix p,matrix q);
friend matrix operator*(matrix p,matrix q);
void print();
};
matrix::matrix(short r,short c)
{
rows=r;
cols=c;
elems=new double[r*c];
}
double matrix::operator ()(short r,short c)
{
return (r>=1&&r<=rows&&c>=1&&c<=cols)?elems[(r-1)*cols+(c-1)]:0.0;
}
void matrix::setelem(short r,short c,double v)
{
if(r>=1&&r<=rows&&c>=1&&c<=cols)
elems[(r-1)*cols+(c-1)]=v;
}
matrix operator+(matrix p,matrix q)
{
matrix m(p.rows,p.cols);
if(p.rows!=q.rows||p.cols!=q.cols)
{
cout<<"error";
}
for(int i=1;i<=p.rows;i++)
{
for(int j=1;j<=p.cols;j++)
{
m.setelem(i,j,p(i,j)+q(i,j));
}
}
return m;
}
matrix operator-(matrix p,matrix q)
{
matrix m(p.rows,p.cols);
if(p.rows!=q.rows||p.cols!=q.cols)
{
cout<<"error";
}
for(int i=1;i<=p.rows;i++)
{
for(int j=1;j<=p.cols;j++)
{
m.setelem(i,j,p(i,j)-q(i,j));
}
}
return m;
}
matrix operator*(matrix p,matrix q)
{
matrix m(p.rows,q.cols);
if(p.cols!=q.rows)
cout<<"error";
for(int i=1;i<=p.rows;i++)
{
for(int j=1;j<=q.cols;j++)
{
m.setelem(i,j,0.0);
for(int k=1;k<=p.cols;k++)
{
m.setelem(i,j,m(i,j)+p(i,k)+q(k,j));
}
return m;
}
} //掉了两个括号，其他没错
}
void matrix::print()
{
for(int i=1;i<=rows;i++)
{
for(int j=1;j<=cols;j++)
{
cout<<setw(7)<<(*this)(i,j);
}
cout<<endl;
}
}
void main()
{
matrix a(2,3),b(2,3),c(3,2),d(2,3),e(2,2);
a.setelem(1,1,-1.1);
a.setelem(1,2,2.2);
a.setelem(1,3,-3.3);
a.setelem(2,1,4.4);
a.setelem(2,2,-5.5);
a.setelem(2,3,6.6);
cout<<"A:"<<endl;a.print();
}

作者: 火之雄狮 时间: 2009-11-3 01:43
谢谢你了以后我会注意的
呵呵

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