Tasks and Solutions: Classes C ++

37 thoughts on “Tasks and Solutions: Classes C ++”

1. That's how I made the third task:
   #include “pch.h”
   #include
   #include
   #include
   #include
   #include
   #include
   using namespace std;
   class Matrix
   {
   int rows, cols;
   int arr[100][100];
   int i, j;
   public:
   void Fill_array()
   {
   this->cols = cols;
   this->rows = rows;
   cout <> rows; cout << endl;
   cout <> cols; cout <arr[rows][cols];

   for ( i = 0; i < rows; i )
   {
   for ( j = 0; j < cols; j )
   {
   arr[i][j] = rand() % 10;
   }
   }
   }
   void Change_array()
   {
   cout << "Matrix\n\n";
   for ( i = 0; i < rows; i )
   {
   for ( j = 0; j < cols; j )
   {
   cout << setw(4) << arr[i][j];
   }
   cout << endl;
   }
   cout << "\nModified matrix\n\n";
   for ( j = 0; j < cols; j )
   {
   for ( i = 0; i < rows; i )
   {
   cout << setw(4) << arr[i][j];
   }
   cout << endl;
   }
   }
   };

   int main()
   {
   SetConsoleCP(1251);
   SetConsoleOutputCP(1251);
   srand(time(NULL));

   Matrix a;
   a.Fill_array();
   a.Change_array();

   return 0;
   }

   Reply

2. //1 the task.
   class Tiles
   #include
   {public:
   string brand;
   int size_h;
   int size_w;
   double price; int data;
   void setData(int x,int y)
   {
   size_h=x;
   size_w=y;
   }
   void getData()
   {
   cout << "\tНазвание = " << brand << "\tВысота= " << size_h << "\tШирина = " << size_w << "\tСтоимость = " << price << endl;

   }
   void Print()
   {
   cout <<"\tНазвание = "<< brand << "\tВысота= " << size_h << "\tШирина = " << size_w << "\tСтоимость = " << price << endl;
   }

   };
   int main()
   {
   setlocale(LC_ALL, "rus");
   Tiles Keramika;
   Keramika.brand = "Керамика из Италии";
   Keramika.price = 2.3;
   Tiles bKeramika;
   Keramika.setData(5, 6);
   Keramika.getData();
   bKeramika.price=30.5;
   bKeramika.size_h=20;
   bKeramika.size_w = 10;
   bKeramika.brand = "Керамика из Франции";
   bKeramika.Print();
   }

   Reply

3. //void FillArray-class method. void Exchange-separate function
   #include
   using namespace std;
   int **arr;
   class Inverse
   {
   public:
   void FillArray(int raw, int col)
   {
   arr = new int*[raw];
   for (int i = 0; i < raw; i )
   {
   arr[i] = new int[col]; //assigning to each element of a new line array dyn, responsible for speakers
   }

   for (int i = 0; i < raw; i )
   {
   cout << "|";
   for (int j = 0; j < col; j )
   {
   arr[i][j] = rand() % 20;
   cout << arr[i][j] << "\t";
   }
   cout << "|" << endl;
   }
   }
   };

   void Exchange(int raw, int col)
   {
   ** = new NARR you're *[col];

   for (int i = 0; i < col; i )
   {
   fool[i] = new int[raw]; //assigning to each element of a new line array dyn, responsible for speakers
   }
   for (int i = 0; i < col; i )
   {
   for (int j = 0; j < raw; j )
   {
   fool[i][j] = arr[j][i];
   }
   cout << endl;
   }
   for (int i = 0; i < raw; i )
   {
   delete[] arr[i];//rid of old data from the array
   }
   delete[] arr;
   arr = new int*[col];
   for (int i = 0; i < col; i )
   {
   arr[i] = new int[raw];
   }
   for (int i = 0; i < col; i )
   {
   cout << "|";
   for (int j = 0; j < raw; j )
   {
   arr[i][j] = fool[i][j];
   cout << arr[i][j] << "\t";
   }
   cout << "|" << endl;
   }

   for (int i = 0; i < col; i )
   {
   delete[] fool[i];
   }
   delete[] fool;
   }

   int main()
   {
   int raw = 7;
   int col = 10;
   Inverse a;
   a.FillArray(raw, col);
   Exchange(raw, col);
   return 0;
   }

   Reply

4. Without pointers, and one method. Who gives a warning, add key -std = c ++ 11 compiler. But work without it.

   #include
   using namespace std;
   class mass
   {
   int massStroka[5][2]={};
   int massCtolbez[2][5]={};
   public:
   void zapolnMass()
   {
   int a =0;
   int kolvoStr;
   int kolvoCtlb;
   cout<<" Enter the number of rows. "<>kolvoStr;
   cout<<" Enter the number of columns. "<>kolvoCtlb;
   for (int i=0;i<kolvoStr;i )
   {
   cout<<endl;
   for(int j =0;j<kolvoCtlb;j )
   {
   a++;

   massStroka[i][j] = a;
   massCtolbez[j][i] = a ;
   cout << "|" ;
   cout<<massStroka[i][j];
   cout << "|" ;
   }
   }
   cout<<endl;

   for (int z=0;from<kolvoCtlb;with ++)
   {
   cout<<endl;
   cout << "|";
   for(int k =0;k<kolvoStr;k )
   {
   cout<<massCtolbez[from][k];
   }
   cout << "|";
   }
   }
   };

   int main ()
   {
   setlocale(LC_ALL, "rus");
   mass a1;
   a1.zapolnMass();

   return 0;
   }

   Reply

5. 3 the task. Prompt, all is good?

   #include
   #include

   using namespace std;

   class Matrix
   {
   private:
   int arr[3][4];
   public:
   void vivodnorn()
   {
   for (int i = 0; i < 3; i )
   {
   for (int k = 0; k < 4; k )
   {
   arr[i][k] = rand() % 132;
   cout << arr[i][k] << "\t";

   }
   cout << endl;
   }
   }

   void vivodfuc()
   {
   for (int i = 0; i < 4; i )
   {
   for (int k = 0; k < 3; k )
   cout << arr[k][i] << "\t";
   cout << endl;
   }
   }
   };

   int main(int vage)
   {
   setlocale(0, "");
   srand(time(0));

   Matrix a;
   a.vivodnorn();
   cout << endl << endl;
   a.vivodfuc();

   return 0;
   }

   Reply

6. In the third task, a memory leak without a destructor

   Reply

7. Through the class constructor 1 the task is easier to do
   #include
   #include
   using namespace std;
   class Tiles {
   private:
   double size_h;
   double size_w;
   double price;
   string Brend;
   public:
   Tiles(double size_h1, double size_w1, double price1, string Brend1) {
   size_h = size_h1;
   size_w = size_w1;
   price = price1;
   Brand = Brand1;
   }
   void Getobject() {
   cout << size_h << " X " << size_w << endl << "$" << price << endl << "Bramnd " << Brand << endl;
   }
   };
   void main() {
   Tiles a(12,14.5,20.5,"EPTA");
   a.Getobject();
   }

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8. Second number
   #include
   #include
   #include
   using namespace std;
   class Children {
   private:
   int age;
   string name;
   string surname;
   public:
   void SetChildren() {
   cin >> age;
   cin >> name;
   cin >> surname;
   }
   void Print() {
   cout << "имя "<<name<<endl<<"Фамилия "<<surname<<endl<<"Возраст"<<age<<endl;
   }
   };
   void main() {
   SetConsoleCP(1251);
   SetConsoleOutputCP(1251);
   Children a;
   a.SetChildren();
   a.Print();
   }

   Reply