Question

Class Exercise Write a program that does the following: 1. Defines a class named Data that has the following members a. A vector of integers entitled numbers (Private) b. Methods (Functions) (Public): i. Display_Menu Prompts the user to choose one of the following 0. Quit 1. Input Numbers 2. Display Numbers 3. Search Numbers 4. Delete Numbers Input_Numbers (Allows user to push integers onto the vector entitled numbers) ii. ii Display_Numbers (Outputs the content of the vector numbers) iv. Search Numbers (Searches the numbers vector and outputs the index of where it is found; it outputs a message that it was not found otherwise) v. Delete_Numbers(deletes all integers in the vector numbers) 2. Define each method. You do not need to define a constructor for this class. 3. Define a main function that makes use of all members of a Data object. Allow the user to continue until they indicate that they want to quit.

Please answer this question in C++.

Also, please write it with 'using namespace std' because the other ways some of you do it is confusing.

Answer 1

Code:

#include<iostream>
#include<vector>
using namespace std;
class Data
{
   vector<int> numbers;
   public:
       void display_menu();
       void input_numbers();
       void display_numbers();
       void search_numbers();
       void delete_numbers();
};
void Data::display_menu()
{
   while(1)
   {
       cout<<"Enter 0-Quit, 1. Input, 2. Display, 3. search, 4. delete: ";
       int ch;cin>>ch;
       if(ch == 0)
       {
           break;
       }
       else if(ch == 1)
       {
           input_numbers();
       }
       else if(ch == 2)
       {
           display_numbers();
       }
       else if(ch == 3)
       {
           search_numbers();
       }
       else if(ch == 4)
       {
           delete_numbers();
       }
       else
       {
           cout<<"Enter a valid choice"<<endl;
       }
   }
}
void Data::input_numbers()
{
   cout<<"Enter number: "<<endl;int num;cin>>num;
   numbers.push_back(num);//insert number
}
void Data::search_numbers()
{
   cout<<"Enter number to search: "<<endl;int num;cin>>num;
   vector<int>::iterator it;
   for(it = numbers.begin();it!=numbers.end();it++)
   {
       if(*it == num)
       {
           cout<<"Found at "<<it-numbers.begin()<<endl;
           break;
       }
   }
   if(it == numbers.end())//not found
   {
       cout<<"Number not found"<<endl;
   }
}
void Data::display_numbers()
{
   if(numbers.size() == 0)
   {
       cout<<"Vector empty"<<endl;
   }
   else
   {
       for(vector<int>::iterator it = numbers.begin();it!=numbers.end();it++)
       {
           cout<<*it<<" ";
       }
       cout<<endl;
   }
}
void Data::delete_numbers()
{
   numbers.clear();//delete contents of numbers
}
int main()
{
   Data obj;obj.display_menu();
   return 0;
}

Output: