=====count=====
Syntax:

<code>
    #include <algorithm>
    typename iterator_traits<input_iterator>::difference_type
    count( input_iterator start, input_iterator end, const TYPE& val );
</code>

The count() function returns the number of elements between start and end that
match val.

For example, the following code uses count() to determine how many integers in
a vector match a target value:

<code>
   vector<int> v;
   for( int i = 0; i < 10; i++ ) {
     v.push_back( i );
   }

   int target_value = 3;
   int num_items = count( v.begin(), v.end(), target_value );

   cout << "v contains " << num_items << " items matching " << target_value <<
  endl;
</code>

The above code displays the following output:

<code terminal>
   v contains 1 items matching 3
</code>

Related Topics: [[accumulate]], [[adjacent_difference]], [[count_if]], [[inner_product]], [[partial_sum]]