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Course Queries Syllabus Queries 2 years ago
Posted on 16 Aug 2022, this text provides information on Syllabus Queries related to Course Queries. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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I got the following class:
class Matrix{ private: int rows; int columns; double* matrix; public: Matrix(); explicit Matrix(int N); Matrix(int M, int N); void setValue(int M, int N, double value); double getValue(int M, int N); bool isValid() const; int getRows(); int getColumns(); ~Matrix(); friend ostream& operator<<(ostream &out, Matrix&matrix1); Matrix &operator=(const Matrix &m) { if (rows * columns != m.rows * m.columns){ delete [] this->matrix; this->matrix = new double[m.rows * m.columns]; } rows = m.rows; columns = m.columns; for(int i = 0; i < rows; i++){ for(int j = 0; j < columns; j++){ this->matrix[i * columns + j] = m.matrix[i * columns + j]; } } return *this; } Matrix(const Matrix &rhs); };
with these functions
#include #include "Matrix.h" using namespace std; //OPPGAVE 2 Matrix::Matrix(){ matrix = NULL; } Matrix::Matrix(int N){ matrix = REPLY 0 views 0 likes 0 shares Facebook Twitter Linked In WhatsApp
What follows is hideous kludgery to satisfy an incompetent professor. Don't do this in the real world.
First, the misnamed "copy" constructor. If we weren't worried about the dimensions, we could do this (shudder):
Vector(const Matrix & other) { *this = other; }
But we must check the dimensions first. We could do it this way:
Vector(const Matrix & other) { if(other.getColumns()==1) *this = other; }
But some chucklehead neglected to make getColumns() const, so this results in a compiler error. We could do something truly drastic, const cast:
getColumns()
Vector(const Matrix & other) { Matrix *p = const_cast<Matrix *>(&other); if(p->getColumns()==1) *this = other; }
Or just something facepalmingly awful:
Vector(const Matrix & other) { Matrix M(other); // notice that this is not const if(M.getColumns()==1) *this = other; }
Do you need help with the isValid stuff?
isValid
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