2个矩阵相加和相乘的C++程序

Question

我用 C++ 编写了这段代码，使用运算符重载对 2 个矩阵进行加法和乘法运算。当我执行代码时，它会在第 57 行和第 59 行产生错误，非法结构操作(两行都出现相同的错误)。请解释我的错误。提前致谢:)

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，不能直接放在 cout 流上。只需在单独的行中调用它即可。

改变

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

到

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

---

或者，您可以为矩阵类重载 << 运算符。然后你可以做

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