unordered_multiset count() function in C++ STL (original) (raw)

Last Updated : 2 Aug, 2018

The unordered_multiset::count() is a built-in function in C++ STL which returns the count of elements in the unordered_multiset container which is equal to a given value. Syntax:

unordered_multiset_name.count(val)

Parameters: The function accepts a single mandatory parameter val which specifies the element whose count in the unordered_multiset container is to be returned. Return Value: It returns an unsigned integral type which denotes the number of times a value occurs in the container. Below programs illustrates the above function: Program 1:

CPP `

// C++ program to illustrate the // unordered_multiset::count() function #include <bits/stdc++.h> using namespace std;

int main() {

// declaration
unordered_multiset<int> sample;

// inserts element
sample.insert(11);
sample.insert(11);
sample.insert(11);
sample.insert(12);
sample.insert(13);
sample.insert(13);
sample.insert(14);

cout << "11 occurs " << sample.count(11) << " times";
cout << "\n12 occurs " << sample.count(13) << " times";
cout << "\n13 occurs " << sample.count(13) << " times";
cout << "\n14 occurs " << sample.count(14) << " times";

return 0;

}

`

Output:

11 occurs 3 times 12 occurs 2 times 13 occurs 2 times 14 occurs 1 times

Program 2:

CPP `

// C++ program to illustrate the // unordered_multiset::count() function #include <bits/stdc++.h> using namespace std;

int main() {

// declaration
unordered_multiset<char> sample;

// inserts element
sample.insert('a');
sample.insert('a');
sample.insert('a');
sample.insert('b');
sample.insert('b');
sample.insert('c');
sample.insert('c');

cout << "a occurs " << sample.count('a') << " times";
cout << "\nb occurs " << sample.count('b') << " times";
cout << "\nc occurs " << sample.count('c') << " times";

return 0;

}

`

Output:

a occurs 3 times b occurs 2 times c occurs 2 times