Question

我用c ++编写了这段代码，使用运算符重载来添加和乘以2个矩阵。当我执行代码时，它在第57和59行产生错误，非法结构操作（两行都有相同的错误）。请解释我的错误。在此先感谢：）

class matrix{
public:
int i, j, row, col, mat[10][10];
void input();
matrix operator+(matrix mm2);
matrix operator*(matrix mm2);
void output();
};
void matrix::input(){
cout<<"\nEnter number of rows and columns : ";
cin>>row>>col;
cout<<"\nEnter the elements : ";
for(i=0; i<row; i++){
    for(j=0;j<col;j++){
        cin>>mat[i][j];
    }
}
}
matrix matrix::operator+(matrix mm2){
matrix temp;
temp.row=row;
temp.col=col;
for(i=0; i<temp.row; i++){
    for(j=0; j<temp.col; j++){
        temp.mat[i][j]=mat[i][j]+mm2.mat[i][j];
    }
}
return temp;
}
matrix matrix::operator*(matrix mm2){
matrix temp;
temp.row=row;
temp.col=col;
for(i=0; i<temp.row; i++){
    temp.mat[i][j]=0;
    for(j=0; j<temp.col; j++){
        temp.mat[i][j]+=mat[i][j]*mm2.mat[i][j];
    }
}
return temp;
}
void matrix::output(){
cout<<"Matrix is : ";
for(i=0;i<row;i++){
    for(j=0;j<col;j++){
        cout<<mat[i][j]<<"\t";
    }
    cout<<"\n";
}
}
int main(){
matrix m1, m2, m3;
clrscr();
m1.input();
m2.input();
m3=m1+m2;
cout<<"\nSum is "<<m3.output();
m3=m1*m2;
cout<<"\nProduct is "<<m3.output();
getch();
return 0;
}

Answer 1

output（）是一个函数，你不能直接把它放在cout流上。只需在单独的行中调用它。

更改

cout<<"\nSum is "<<m3.output();
...
cout<<"\nProduct is "<<m3.output();

要

cout<<"\nSum is ";
m3.output();
...
cout<<"\nProduct is ";
m3.output();

或者，您可以重载＆lt;＆lt;矩阵类的运算符。然后就可以了

cout<<"\nSum is "<<m3;
...
cout<<"\nProduct is "<<m3;

Answer 2

常见错误：

matrix matrix::operator+(matrix mm2)应为matrix matrix::operator+(const matrix& mm2){。此外，由于您没有复制构造函数，这会导致意外行为。

这是重载operator +的另一种方法，概念可以扩展到其他运算符：

//declared as friend
template <class T> CMatrix<T> operator+(const CMatrix<T>& a, const CMatrix<T>& b)
{
    unsigned int a_row=a.m_row;unsigned int a_col=a.m_column;
    unsigned int b_row=b.m_row;unsigned int b_col=b.m_column;
    if(a_row!=b_row||a_col!=b_col) throw "Dimensions do not agree";
    CMatrix<T> addition(a_row,b_col);
    T temp=0;
    for(unsigned int i = 0; i <a_row; i++ )
        for(unsigned int j = 0; j < b_col; j++ )
        {
            T temp1=a.GetCellValue(i,j);
            T temp2=b.GetCellValue(i,j);
            temp=temp1+temp2;
            addition.SetCellValue(i,j,temp);
        }

    return addition;
}

用于添加和乘以2个矩阵的C ++程序

2 个答案: