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C++ algorithm count() function

❮ Algorithm Functions

Example

Count how many times the number 5 appears in a vector:

vector<int> numbers = {1, 2, 7, 5, 3, 5, 9, 2, 5};
int amount = count(numbers.begin(), numbers.end(), 5);
cout << "The number 5 appears " << amount << " times";
Try it Yourself »

Definition and Usage

The count() function searches for a specified value and returns the number of times that it appears in a data range.

The range of data is specified by iterators.

Syntax

count(iterator start, iterator end, <type> value);

<type> refers to the type of the data that the range contains.

Parameter Values

Parameter Description
start Required. An iterator pointing to the start of the data range being searched.
end Required. An iterator pointing to the end of the data range being searched. Elements up to this position will be searched, but the element at this position will not be included.
value Required. The value to search for.

Technical Details

Returns: An integer representing the number of times the specified value appears in the data range.

Related Pages

Read more about data structures in our Data Structures Tutorial.

Read more about iterators in our Iterators Tutorial.

Read more about algorithms in our Algorithms Tutorial.

❮ Algorithm Functions