How to Get Length of a Set in C++ - Step by Step Examples

How to Get Length of a Set in C++ ?

Answer

To get the size of a set in C++, you can use the size method on the set.


✐ Examples

1 Get Size of Set

In this example,

  1. We include the necessary header file <set> for using sets in C++.
  2. We create a set named set1 using the std::set template with some elements.
  3. We use the size method on the set object set1 to get the number of elements in the set.
  4. The size method returns the size of the set.
  5. Finally, we print the size of the set to standard output.

C++ Program

#include <iostream>
#include <set>

int main() {
    std::set<std::string> set1 {"apple", "banana", "cherry"};

    size_t size = set1.size();
    std::cout << "Size of set1: " << size << std::endl;
    return 0;
}

Output

Size of set1: 3

2 Get Size of Empty Set

In this example,

  1. We include the necessary header file <set> for using sets in C++.
  2. We create an empty set named emptySet using the std::set template.
  3. We use the size method on the set object emptySet to get the number of elements in the set.
  4. Since the set is empty, the size method returns 0.
  5. Finally, we print the size of the empty set to standard output.

C++ Program

#include <iostream>
#include <set>

int main() {
    std::set<std::string> emptySet;

    size_t size = emptySet.size();
    std::cout << "Size of emptySet: " << size << std::endl;
    return 0;
}

Output

Size of emptySet: 0

Summary

In this tutorial, we learned How to Get Length of a Set 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++ ?
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  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++ ?