How to use count function in c++

The count() function in C The count() function counts the number of occurrences of a specific element in a container. Syntax: size_t count(const Type& element); Parameters: element, the element to be found. Return value: the number of times the element appears. Usage: Take the element to be counted as a parameter, and the function returns its number of occurrences.

The count() function in C

In C, the count() function is a container operation function , used to count the number of occurrences of a specific element in a container.

Syntax:

size_t count(const Type& element);

Parameters:

• element: The element to be found .

Return value:

• The number of times the element appears in the container.

Instructions:

To use the count() function, simply pass the element whose occurrence you want to count as a parameter to the function. . This function returns the number of occurrences of the element in the container.

Example:

#include <vector>

int main() {
  // 创建一个包含整数的 vector
  std::vector<int> numbers = {1, 2, 3, 4, 5, 1, 2, 3};

  // 计算 vector 中数字 3 出现的次数
  int count_of_3 = std::count(numbers.begin(), numbers.end(), 3);

  // 打印数字 3 出现的次数
  std::cout << "数字 3 出现的次数：" << count_of_3 << std::endl;

  return 0;
}

Output:

数字 3 出现的次数：2

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