Multiset in C++ - Sanfoundry

This C++ Program demonstrates implementation of Multiset in STL.

Here is source code of the C++ Program to demonstrate Multiset in STL. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Implement Multiset in Stl

```
 */
```
```
#include <iostream>
```
```
#include <set>
```
```
#include <string>
```
```
#include <cstdlib>
```
```
using namespace std;
```
```
int main()
```
```
{
```
```
    multiset<int> ms;
```
```
    multiset<int>::iterator it, it1;
```
```
    int choice, item;
```
```
    while (1)
```
```
    {
```

        cout<<"\n---------------------"<<endl;

        cout<<"Multiset Implementation in Stl"<<endl;

        cout<<"\n---------------------"<<endl;

        cout<<"1.Insert Element into the Multiset"<<endl;

        cout<<"2.Delete Element from the Multiset"<<endl;

        cout<<"3.Find Element in a Multiset"<<endl;

        cout<<"4.Count Elements with a specific key"<<endl;

        cout<<"5.Size of the Multiset"<<endl;

        cout<<"6.Display Multiset"<<endl;

```
        cout<<"7.Exit"<<endl;
```
```
        cout<<"Enter your Choice: ";
```
```
        cin>>choice;
```
```
        switch(choice)
```
```
        {
```
```
        case 1:
```

            cout<<"Enter value to be inserted: ";

```
            cin>>item;
```
```
            if (ms.empty())
```
```
                it1 = ms.insert(item);
```
```
            else
```

                it1 = ms.insert(it1, item);

```
            break;
```
```
        case 2:
```

            cout<<"Enter value to be deleted: ";

```
            cin>>item;
```
```
            ms.erase(item);
```
```
            break;
```
```
        case 3:
```

            cout<<"Enter element to find ";

```
            cin>>item;
```
```
            it = ms.find(item);
```
```
            if (it != ms.end())
```

                cout<<"Element found"<<endl;

```
            else
```

                cout<<"Element not found"<<endl;

```
            break;
```
```
        case 4:
```

            cout<<"Enter element to be counted: ";

```
            cin>>item;
```

            cout<<item<<" appears "<<ms.count(item)<<" times."<<endl;

```
            break;
```
```
        case 5:
```

            cout<<"Size of the Multiset: "<<ms.size()<<endl;

```
            break;
```
```
        case 6:
```

            cout<<"Elements of the Multiset:  ";

            for (it = ms.begin(); it != ms.end(); it++)

```
                cout<<*it<<"  ";
```
```
            cout<<endl;
```
```
            break;
```
```
		case 7:
```
```
            exit(1);
```
```
	        break;
```
```
        default:
```
```
            cout<<"Wrong Choice"<<endl;
```
```
        }
```
```
    }
```
```
    return 0;
```
```
}
```

$ g++ multiset.cpp
$ a.out
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 1
Enter value to be inserted: 100
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 1
Enter value to be inserted: 200
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 1
Enter value to be inserted: 300
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 1
Enter value to be inserted: 400
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 1
Enter value to be inserted: 500
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 5
Size of the Multiset: 5
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 6
Elements of the Multiset:  100  200  300  400  500  
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 2
Enter value to be deleted: 300
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 5
Size of the Multiset: 4
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 6
Elements of the Multiset:  100  200  400  500  
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 4
Enter element to be counted: 100
100 appears 1 times.
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 1
Enter value to be inserted: 100
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 6
Elements of the Multiset:  100  100  200  300  400  500  
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 4
Enter element to be counted: 100
100 appears 2 times.
 
---------------------
Multiset Implementation in Stl
 
---------------------
1.Insert Element into the Multiset
2.Delete Element from the Multiset
3.Find Element in a Multiset
4.Count Elements with a specific key
5.Size of the Multiset
6.Display Multiset
7.Exit
Enter your Choice: 7
 
------------------
(program exited with code: 1)
Press return to continue

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