Demo Sets Container

// main.cpp
// SetsDemo
// Created by Kevin Roark

#include <iostream> // Include the I/O stream library for input and output
#include <set> // Include the set container library
using namespace std; // Use the standard namespace to avoid typing "std::" before common functions

int main() {
    set<int> mySet; // Declare a set to store integers
    set<string> strSet; //Declare a set to store strings

    // Insert elements into the set. Duplicate elements will not be added.
    mySet.insert(5);
    mySet.insert(3);
    mySet.insert(8);
    mySet.insert(1);
    mySet.insert(4);
    mySet.insert(7);
    mySet.insert(1); // This will not be added to the set as 1 is already present
    mySet.insert(10);
    
    //insert some strings
    strSet.insert("John");
    strSet.insert("Sally");
    strSet.insert("Fred");
    strSet.insert("Barney");
    
   
    // Output the size of the set
    cout << "Set size: " << mySet.size() << endl;

    // Output all the elements in the set
    // The elements will be in sorted order as that is how set stores them
    cout << "Set elements: ";
    for (int x : mySet) {
        cout << x << " ";
    }
    cout << endl;

    // Check if the element '7' is present in the set
    if (mySet.find(7) != mySet.end()) {
        cout << "7 is in the set" << endl;
    }

    // Erase the element '4' from the set
    mySet.erase(4);

    // Output the size of the set after erasing an element
    cout << "Set size after erasing 4: " << mySet.size() << endl;

    // Output all the elements in the set after erasing an element
    cout << "Set elements after erasing 4: ";
    for (int x : mySet) {
        cout << x << " ";
    }
    cout << endl;
    
    cout << "Now lets look at our string set: " << endl;
    for (string str : strSet) {
        cout << str << endl;
    }
    cout << endl;
    cout << "Erasing John" << endl;
    strSet.erase("John");
    for (string str : strSet) {
        cout << str << endl;
    }

    return 0; // Return 0 to indicate successful completion
}