C++ .size()

The .size() method is used to determine the number of elements currently stored in a std::set.

Syntax

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:

#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;
}

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The output of this code is:

The average of the integers in the set is: 25

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Codebyte Example

This codebyte example creates a grades set of type int, inserts several values, and prints the number of elements:

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