[Term Entry] C++ Sets: size()

content/cpp/concepts/sets/terms/size/size.md

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+---
+Title: '.size()'
+Description: 'Returns the number of elements in the set.'
+Subjects:
+  - 'Computer Science'
+  - 'Game Development'
+Tags:
+  - 'Data Types'
+  - 'Sets'
+CatalogContent:
+  - 'learn-c-plus-plus'
+  - 'paths/computer-science'
+---
+
+The **`.size()`** method is used to determine the number of elements currently stored in a `std::set`.
+
+## Syntax
+
+```pseudo
+setName.size();
+```
+
+**Parameters:**
+
+This method does not take any parameters.
+
+**Return value:**
+
+Returns the current number of elements in the set as an unsigned integer (`size_type`).
+
+## Example: Calculating the Average of Set Elements
+
+In this example, a set is created, values are inserted, and the average of the elements is calculated using `.size()` to get the count:
+
+```cpp
+#include <iostream>
+#include <set>
+
+int main() {
+  // Initialize set
+  std::set<int> numbers;
+
+  // Insert values into set
+  numbers.insert(24);
+  numbers.insert(26);
+  numbers.insert(30);
+  numbers.insert(20);
+
+  int sum = 0;
+  for (int num : numbers) {
+    sum += num;
+  }
+
+  // Calculate and print average
+  std::cout << "The average of the integers in the set is: "
+            << sum / numbers.size() << "\n";
+
+  return 0;
+}
+```
+
+The output of this code is:
+
+```shell
+The average of the integers in the set is: 25
+```
+
+## Codebyte Example
+
+The following Codebyte example creates a `grades` set of type `int`, inserts several values, and prints the number of elements:
+
+```codebyte/cpp
+#include <iostream>
+#include <set>
+
+int main() {
+  // Initialize set
+  std::set<int> numbers;
+
+  // Insert values into set
+  numbers.insert(90);
+  numbers.insert(34);
+  numbers.insert(2);
+  numbers.insert(101);
+
+  // Print number of elements in the set
+  std::cout << "The set contains " << numbers.size() << " elements.\n";
+
+  return 0;
+}
+```