Question

This program illustrates dynamic variables
#include <iostream>
using namespace std;

int main ()
{
   int *p1;

   p1 = new int;             // Variables created using the new operator are called dynamic variables

   cout << "Enter an integer \n";
   cin >> *p1;
   *p1 = *p1 + 7;
   cout << << "Your input + 7 = " << *p1 << endl;

   delete p1;                // Delete the dynamic variable p1 and return the memory occupied by p1 to the freestore to be reused.

   return 0;
}

Problem is:

Define a class Area that has two private variable members; units of type string and area_value of type float. Modify the program to create a dynamic variable of type Area.
    1) Input from the keyboard the area_value and its units. Compute one-half and one-quarter of the area and display the results
    2) Destroy the dynamic variable at the end

Answer 1

#include <iostream>

#include <cstring>

using namespace std;

class Area{

private:

string unit;

float area_value;

public:

Area(){

}

Area(string s, float f){

unit = s;

area_value = f;

}

string getUnit(){

return unit;

}

float getValue(){

return area_value;

}

};

int main() {

string s;

float f;

cout<<"Enter unit: ";

cin>>s;

cout<<"Enter area value: ";

cin>>f;

Area *a = new Area(s,f);

cout<<"One half of area value is: "<<0.5*a->getValue()<<" "<<a->getUnit()<<endl;

cout<<"One quater of area value is: "<<0.25*a->getValue()<<" "<<a->getUnit()<<endl;

delete a;

}

==========================================
SEE OUTPUT


6 main.cpp E saved clang version 7.0.0-3-ubuntu0.18.04.1 (tags/RELEASE Files 0/final) Enter unit: metres Enter area value: 2 One half of area value is: 1 metres One quater of area value is: 0.5 metres 4 class Areat main.cpp 6 private: 7 string unit; 8 float area_value; 10 public: 12 Area) 13 14 15 Area(string s, float f) 16 17 18 19 20 21 string getUnit) unit = s; area_value - f; return unit; 23 24 25 float getValue) 26 27 28 29 30 31 return area_value;

Thanks, PLEASE COMMENT if there is any concern.