How to create a Set of integers in C++

How to create a Set of integers in C++ ?

Answer

In C++, you can use the standard library's set data structure to create a set of integers.


✐ Examples

1 Create Set of Integers using std::set

In this example,

  1. We include the <set> header for using the std::set data structure.
  2. We define a set named numberSet to store integers.
  3. We insert unique integers into the set using the insert() method.
  4. The resulting set contains unique integers in sorted order.

C++ Program

#include <iostream>
#include <set>

int main() {
    // Define a set of integers
    std::set<int> numberSet;

    // Insert integers into the set
    numberSet.insert(1);
    numberSet.insert(2);
    numberSet.insert(3);
    numberSet.insert(4);
    numberSet.insert(5);

    // Print the set
    std::cout << "{ ";
    for (const auto &num : numberSet) {
        std::cout << num;
        if (num != *numberSet.rbegin()) {
            std::cout << ", ";
        }
    }
    std::cout << " }";

    return 0;
}

Output

{ 1, 2, 3, 4, 5 }

2 Create Set of Integers using std::unordered_set

In this example,

  1. We include the <unordered_set> header for using the std::unordered_set data structure.
  2. We define an unordered set named numberSet to store integers.
  3. We insert unique integers into the set using the insert() method.
  4. The resulting set contains unique integers in an unordered manner.

C++ Program

#include <iostream>
#include <unordered_set>

int main() {
    // Define an unordered set of integers
    std::unordered_set<int> numberSet;

    // Insert integers into the set
    numberSet.insert(1);
    numberSet.insert(2);
    numberSet.insert(3);
    numberSet.insert(4);
    numberSet.insert(5);

    // Print the set
    std::cout << "{ ";
    for (const auto &num : numberSet) {
        std::cout << num;
        if (num != *numberSet.begin()) {
            std::cout << ", ";
        }
    }
    std::cout << " }";

    return 0;
}

Output

{ 1, 2, 3, 4, 5 }

Summary

In this tutorial, we learned How to create a Set of integers in C++ language with well detailed examples.


More C++ Sets Tutorials

  1. How to create an Empty Set in C++ ?
  2. How to Initialize a Set in C++ ?
  3. How to Get Length of a Set in C++ ?
  4. How to create a Set of size N in C++ ?
  5. How to create a Set of Numbers from 1 to N in C++ ?
  6. How to create a Set of integers in C++ ?
  7. How to create a Set of Strings in C++ ?
  8. How to Access Items in a Set in C++ ?
  9. How to get a Random Item in a Set in C++ ?
  10. How to Iterate Over a Set in C++ ?
  11. How to check if a Set is Empty in C++ ?
  12. How to check if a Set is Not Empty in C++ ?
  13. How to get Subset from a Set in C++ ?
  14. How to check if a Specific Item is present in the Set in C++ ?
  15. How to check if a Set contains all the items of Another Set in C++ ?
  16. How to Sort Items of a Set in C++ ?
  17. How to Copy a Set in C++ ?
  18. How to add an Item to a Set in C++ ?
  19. How to find Union of Two Sets in C++ ?
  20. How to find Intersection of Two Sets in C++ ?
  21. How to check if Two Sets are Equal in C++ ?
  22. How to Convert a Set of Integers to a Set of Strings in C++ ?
  23. How to Convert a Set of Strings to a Set of Integers in C++ ?
  24. How to Convert a Set of Floats to a Set of Strings in C++ ?
  25. How to Filter Items of a Set based on a Condition in C++ ?
  26. How to Remove Specific Item from a Set in C++ ?
  27. How to Remove Items from Set based on a Condition in C++ ?
  28. How to create a Set of Sets in C++ ?