Question

help with C++ code

The aim of this is to practice writing template classes. You must use SafeArray template class and implement a SafeMatrix template class that will allow you to work with two dimensional arrays of any type. The boundaries are checked. You must be able to create instances of SafeMatrix template class like,

SafeMatrix<int> m(2,3);

The above statement will create a 2 by 3 dimensional array of integers. You must be able to access and set values using bracket operators. For example m[0][1] = 5; will set element at row 0 column 1 to an integer value 5. You must be able to return dimensions of the array as follows: m.length() will return the number of rows in your 2D array. m[0].length() will return number of columns in row number 0. Provide all necessary methods to your template class. Write a Driver program that tests your template class with at least two different types.

Answer 1

CODE TO COPY:

#include<iostream>

#define SIZE 500

using namespace std;

//safearray class

template<typename t>

class SafeArray

{

private:

t array[SIZE];

int cols;

  

public:

SafeArray(int cols)

{//parameterized constructors

this->cols=cols;

//if size is smaller, throw an error

if(SIZE<cols)

{

cout<<"Array Size Overfow!!"<<endl;

return;

}

//initialize the values to 0

for(int i=0; i<cols; i++)

array[i]=0;

}

  

//operator overload []

t& operator[](int y)

{

return array[y];

}

  

//return cols in the safearray

int length()

{

return cols;

}

  

//stream operator overload

friend ostream& operator<<(ostream &out, t& valRef)

{

t val=valRef;

out<<val;

return out;

}

  

};

//safematrix class

template <typename t>

class SafeMatrix{

private:

SafeArray<t> *matrix[SIZE];

int rows;

int cols;

public:

//parameterized constructor

SafeMatrix(int rows, int cols)

{

this->rows=rows;//set rows

this->cols=cols; //set columns

if(rows>SIZE)//if size is smaller than rows

{

cout<<"Array Index Overflow!!"<<endl;//throw an error

return;//return

}

//initialize the safearrays

for(int i=0; i<rows; i++)

matrix[i]=new SafeArray<t>(cols);

}

  

//return length of the matrix

int length()

{

return rows;

}

//operator overload[]

SafeArray<t>& operator[](int x)

{

return *matrix[x];//return pointer to SafeArray

}

  

};

int main()

{

SafeMatrix<int> sm(3,3);//create a safe matrix of size 3 by 3

sm[0][1]=5;//set vale at index 0,1 as 5

cout<<"sm.length() -> "<<sm.length()<<endl;//output length of matrix

cout<<"sm[0].length() --> "<<sm[0].length()<<endl; //output length of first row of matrix

cout<<"Value of sm[0][1] -> "<<sm[0][1]<<endl;//output value at 0,1

cin.get();//hold the colsole screen

return 0;

}

PROGRAM SCREENSHOTS:

SafeMatrix.cpp 34. 35 //return cols in the safearray 36 int length) 37 38 39 40 41//stream operator overload 42friend ostream& operator<<(ostream &out, t& valRef) 43 return cols; t val-valRef; out<<val; return out; 45 46 47 48 49 50 51 52 IIsafematrix class 53 template <typename t> 54 class SafeMatrix 56 57 58 59 60 61 62 63 64 65 private: SafeArray<t> *matrix[SIZE]; int rows; int cols; public //parameterized constructor SafeMatrix(int rows, int cols) this->rows-rows;//set rows this->cols-cols; I/set columns 67 Compiler Resources dh Compile Log e , Debug @ Find Results Line: 94 Col: 1 Sel: 0 Lines: 104 Length: 1982 Insert Press Ctrl+F11 to toggle fullscreen or Ctrl+F12 to toggle toolbars

SafeMatrix.cpp this->cols-cols; //set columns 67 69 71 if(rows>SIZE)//if size is smalLer than rows cout<<"Array Index Overflow!!"<<endl;//throw an error return;//return 72 74 76 //initialize the safearrays for(int i-0; i<rows; i++) matrix[i]-new SafeArray<t>(cols); //return length of the matrix int length() 81 82 83 84 85 86 87 return rows //operator overload[ SafeArray<t>& operator[](int x) 89 90 91 92 93 L ; 94 95 int main() 96 97 98 return *matrix[刈://return pointer to SafeArray SafeMatrix<int» sm(3,3);//create a safe matrix of size 3 by 3 sm[@] [11-5;//set vale at index θ,1 as 5 cout<<"sm.length() -"<<sm.length)<<end1;//output length of matrix Compiler Resources dh Compile Log e? Debug @ Find Results Line: 94 Col: 1 Sel: 0 Lines: 104 Length: 1982 Press Ctrl+F11 to toggle fullscreen or Ctrl+F12 to toggle toolbars

SafeMatrix.cpp 71 72 73 74 75 return;//return //initialize the safearrays for(int i-0; i<rows; i++) matrix[i]-new SafeArray<t> (cols); 79 //return length of the matrix int length() 81 82 83 84 85 86 87 return rows //operator overload[J SafeArray<t>& operator[](int x) 89 90 91 92 93 94 return matrix[x];//return pointer to SafeArray 95 int main) 96 97 98 100 101 102 103 104 SafeMatrix<int» sm(3,3);//create a safe matrix of size 3 by 3 sm[@] [11-5;//set vale at index θ,1 as 5 cout<<"sm.length() -"<<sm.length)<<end1;//output length of matrix cout<<"sm[0].length()"<<sm [].length)<<endl; //output length of first row of matrix cout<<"Value of sm[0][1] ->"<<sme][1]<endl;//output value at e,1 cin.get;//hold the colsole screen return e; Compiler Resources dh Compile Log e , Debug @ Find Results Line: 94 Col: 1 Sel: 0 Lines: 104 Length: 1982 Press Ctrl+F11 to toggle fullscreen or Ctrl+F12 to toggle toolbars

OUTPUT:

EAR HOLIDAYS WORKICHEGG causersRajat'Desktop.3rD Y sm.length) 3 smte].length) -> 3 Value of sm[e]1]5 OFFER LETTER)cheg g-C++-questionsmay 2018. SafeMatrix.exe SafeMati afeMatrix OWS cols owS-rows rows 68 69 70 rows SIZE)7 cout endl/7throw an turn 72 76 matrixi afeArrayct>(cols 78 79 80 er length 82 File Deskt D YEAR HOLI LIDAYS WO HE FER LETTER 2018 MIB lati cj9) ENG 10:53 모

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