Question

C++，please help. I have no idea how to do that begining with zero parameter constructor. and help me to test the method,

Write a class template Square Matrix that implements a square matrix of elements of a specified type. The class template should be fully in the Square Matrix.h file. The class uses "raw" pointers to handle the dynamically allocated 2D-array. "Raw" pointers are the classic pointers that you've used before. In addition to it, you will need a variable that stores the array size. For example, the size 10 means that the matrix is 10X10 elements large. Implement the following methods: • Default constructor (aka zero-parameter constructor). • The whole Big Five. Remember to support such constructions as a=b=C and a=a. • Function resize(new_size). This function destroys all previous content of the matrix and releases all memory. Then it allocates new memory. New elements are not specified (can have any value). • Operator=. Matrices A and B are considered equal if their sizes are equal and all elements of A match the corresponding elements of B. . Operator +. The result of addition of two square matrices A and B of the same size is a square matrix C of the same size where each element of C is the sum of corresponding elements from A and B. Consider the input to be always correct (matrix sizes match and matrix elements can be added). • Function at(row, column) that returns a reference to the element in the given row and column. It is important to return reference since we plan to use this function to modify the matrix content. It allows expressions like obj.at(0,4)=7. If the sugge row or column doesn't exist, throw the std::out_of_range exception. • Function size() that returns the current size of the matrix.

Answer 1

Zero parameter constructor is the constructor which will not accept the arguments/Parameters.

Eg :

#include <iostream>

using namespace std;

class Demo

{

private:

int A;

int B;

int C;

public:

Demo();

void set(int A, int B, int C);

void print();

};

Demo::Demo()

{

A=1;

B=1;

C=1;

}

void Demo::set(int A, int B, int C)

{

this->A = A;

this->B = B;

this->C = C;

}

void Demo::print()

{

cout<<"Value of A : "<<A<<endl;

cout<<"Value of B : "<<B<<endl;

cout<<"Value of C : "<<C<<endl;

}

int main()

{

Demo obj = Demo(); //Constructor called when object created

obj.print();

obj.set(10,20,30);

obj.print();

return 0;

}

Here, demo is the default / Zero parameter constructor.