Map in C++ STL - Sanfoundry

This C++ Program demonstrates implementation of Map in Stl.

Here is source code of the C++ Program to demonstrate Map 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 Map in Stl
```
```
 */
```
```
#include <iostream>
```
```
#include <map>
```
```
#include <string>
```
```
#include <cstdlib>
```
```
using namespace std;
```
```
int main()
```
```
{
```
```
    map<char,int> mp;
```
```
    map<char, int>::iterator it;
```
```
    int choice, item;
```
```
    char s;
```
```
    while (1)
```
```
    {
```

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

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

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

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

        cout<<"2.Delete Element of the Map"<<endl;

```
	cout<<"3.Size of the Map"<<endl;
```

        cout<<"4.Find Element at a key in Map"<<endl;

        cout<<"5.Dislplay by Iterator"<<endl;

        cout<<"6.Count Elements at a specific key"<<endl;

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

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

```
            cin>>item;
```
```
            cout<<"Enter the key: ";
```
```
            cin>>s;
```

            mp.insert(pair<char,int>(s  ,item));

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

            cout<<"Enter the mapped string to be deleted: ";

```
            cin>>s;
```
```
            mp.erase(s);
```
```
            break;
```
```
        case 3:
```
```
	    cout<<"Size of Map: ";
```
```
	    cout<<mp.size()<<endl;
```
```
            break;
```
```
        case 4:
```

	    cout<<"Enter the key at which value to be found: ";

```
            cin>>s;
```
```
            if (mp.count(s) != 0)
```

                cout<<mp.find(s)->second<<endl;

```
            else
```

                cout<<"No Element Found"<<endl;

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

	    cout<<"Displaying Map by Iterator: ";

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

```
            {
```

                cout << (*it).first << ": " << (*it).second << endl;

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

            cout<<"Enter the key at which number of values to be counted: ";

```
            cin>>s;
```
```
            cout<<mp.count(s)<<endl;
```
```
            break;
```
```
	case 7:
```
```
            exit(1);
```
```
	    break;
```
```
        default:
```
```
            cout<<"Wrong Choice"<<endl;
```
```
        }
```
```
    }
```
```
    return 0;
```
```
}
```

$ g++ map.cpp
$ a.out
---------------------
Map Implementation in Stl
 
---------------------
1.Insert Element into the Map
2.Delete Element of the Map
3.Size of the Map
4.Find Element at a key in Map
5.Dislplay by Iterator
6.Count Elements at a specific key
7.Exit
Enter your Choice: 1
Enter value to be inserted: 1
Enter the key: a
 
---------------------
Map Implementation in Stl
 
---------------------
1.Insert Element into the Map
2.Delete Element of the Map
3.Size of the Map
4.Find Element at a key in Map
5.Dislplay by Iterator
6.Count Elements at a specific key
7.Exit
Enter your Choice: 1
Enter value to be inserted: 2
Enter the key: b
 
---------------------
Map Implementation in Stl
 
---------------------
1.Insert Element into the Map
2.Delete Element of the Map
3.Size of the Map
4.Find Element at a key in Map
5.Dislplay by Iterator
6.Count Elements at a specific key
7.Exit
Enter your Choice: 1
Enter value to be inserted: 3
Enter the key: c
 
---------------------
Map Implementation in Stl
 
---------------------
1.Insert Element into the Map
2.Delete Element of the Map
3.Size of the Map
4.Find Element at a key in Map
5.Dislplay by Iterator
6.Count Elements at a specific key
7.Exit
Enter your Choice: 1
Enter value to be inserted: 4
Enter the key: d
 
---------------------
Map Implementation in Stl
 
---------------------
1.Insert Element into the Map
2.Delete Element of the Map
3.Size of the Map
4.Find Element at a key in Map
5.Dislplay by Iterator
6.Count Elements at a specific key
7.Exit
Enter your Choice: 1
Enter value to be inserted: 5
Enter the key: e
 
---------------------
Map Implementation in Stl
 
---------------------
1.Insert Element into the Map
2.Delete Element of the Map
3.Size of the Map
4.Find Element at a key in Map
5.Dislplay by Iterator
6.Count Elements at a specific key
7.Exit
Enter your Choice: 3
Size of Map: 5
 
---------------------
Map Implementation in Stl
 
---------------------
1.Insert Element into the Map
2.Delete Element of the Map
3.Size of the Map
4.Find Element at a key in Map
5.Dislplay by Iterator
6.Count Elements at a specific key
7.Exit
Enter your Choice: 4
Enter the key at which value to be found: a
1
 
---------------------
Map Implementation in Stl
 
---------------------
1.Insert Element into the Map
2.Delete Element of the Map
3.Size of the Map
4.Find Element at a key in Map
5.Dislplay by Iterator
6.Count Elements at a specific key
7.Exit
Enter your Choice: 5
Displaying Map by Iterator: a: 1
b: 2
c: 3
d: 4
e: 5
 
---------------------
Map Implementation in Stl
 
---------------------
1.Insert Element into the Map
2.Delete Element of the Map
3.Size of the Map
4.Find Element at a key in Map
5.Dislplay by Iterator
6.Count Elements at a specific key
7.Exit
Enter your Choice: 2
Enter the mapped string to be deleted: c
 
---------------------
Map Implementation in Stl
 
---------------------
1.Insert Element into the Map
2.Delete Element of the Map
3.Size of the Map
4.Find Element at a key in Map
5.Dislplay by Iterator
6.Count Elements at a specific key
7.Exit
Enter your Choice: 5
Displaying Map by Iterator: a: 1
b: 2
d: 4
e: 5
 
---------------------
Map Implementation in Stl
 
---------------------
1.Insert Element into the Map
2.Delete Element of the Map
3.Size of the Map
4.Find Element at a key in Map
5.Dislplay by Iterator
6.Count Elements at a specific key
7.Exit
Enter your Choice: 7
 
 
------------------
(program exited with code: 1)
Press return to continue

Sanfoundry Global Education & Learning Series – 1000 C++ Programs.

If you wish to look at all C++ Programming examples, go to C++ Programs.

If you find any mistake above, kindly email to [email protected]

« Prev - C++ Program to Implement Forward_List in STL

» Next - C++ Program to Implement Multimap in STL

Related Posts:

Check Programming Books
Check Computer Science Books
Check Data Structure Books
Apply for Computer Science Internship
Practice Design & Analysis of Algorithms MCQ

Recommended Articles: