String in C++ STL - Sanfoundry

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

Here is source code of the C++ Program to demonstrate String 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 String in Stl

```
 */
```
```
#include <iostream>
```
```
#include <string>
```
```
#include <cstdlib>
```
```
using namespace std;
```
```
int main()
```
```
{
```
```
    int choice, pos, len;
```
```
    string::iterator it;
```
```
    size_t found;
```

    string s, str = "This is a Test String.";

    cout<<"Initial String is--> "<<str<<endl;

```
    while (1)
```
```
    {
```

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

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

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

        cout<<"1.Insert Substring in a String"<<endl;

        cout<<"2.Erase Substring from a String"<<endl;

	cout<<"3.Append Substring to a String"<<endl;

        cout<<"4.Replace the String with a Substrng"<<endl;

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

        cout<<"6.Find substring in a String"<<endl;

        cout<<"7.Display the String"<<endl;

```
        cout<<"8.Exit"<<endl;
```
```
        cout<<"Enter your Choice: ";
```
```
        cin>>choice;
```
```
        switch(choice)
```
```
        {
```
```
        case 1:
```

            cout<<"Enter the substring to be inserted: ";

```
            cin>>s;
```

            cout<<"Position after which substring to be inserted: ";

```
            cin>>pos;
```
```
            if (pos <= str.length())
```
```
                str.insert(pos, s);
```
```
            else
```

                cout<<"Position out of bounds"<<endl;

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

            cout<<"Position after which substring to be erased: ";

```
            cin>>pos;
```

            cout<<"Length of the substring to be deleted: ";

```
            cin>>len;
```
```
            str.erase(pos, len);
```
```
            break;
```
```
        case 3:
```

            s = " This is an appended string.";

```
            str.append(s);
```
```
            break;
```
```
        case 4:
```
```
            s = "n example";
```
```
            str.replace(9, 5, s);
```
```
            break;
```
```
        case 5:
```

            cout<<"Size of the string: "<<str.size()<<endl;

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

            cout<<"Enter substring to be found: ";

```
            cin>>s;
```
```
            found = str.find(s);
```
```
            if (found != string::npos)
```

                cout <<"Substring "<<s<<" found at " << found <<endl;

```
            else
```

                cout <<"Substring "<<s<<" not found"<<endl;

```
            break;
```
```
        case 7:
```

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

```
                cout<<*it;
```
```
            cout<<endl;
```
```
            break;
```
```
        case 8:
```
```
            exit(1);
```
```
            break;
```
```
        default:
```
```
            cout<<"Wrong Choice"<<endl;
```
```
        }
```
```
    }
```
```
    return 0;
```
```
}
```

$ g++ string.cpp
$ a.out
Initial String is--> This is a Test String.
 
---------------------
String Implementation in Stl
 
---------------------
1.Insert Substring in a String
2.Erase Substring from a String
3.Append Substring to a String
4.Replace the String with a Substrng
5.Size of the String
6.Find substring in a String
7.Display the String
8.Exit
Enter your Choice: 1
Enter the substring to be inserted: example
Position after which substring to be inserted: 5
 
---------------------
String Implementation in Stl
 
---------------------
1.Insert Substring in a String
2.Erase Substring from a String
3.Append Substring to a String
4.Replace the String with a Substrng
5.Size of the String
6.Find substring in a String
7.Display the String
8.Exit
Enter your Choice: 7
This exampleis a Test String.
 
---------------------
String Implementation in Stl
 
---------------------
1.Insert Substring in a String
2.Erase Substring from a String
3.Append Substring to a String
4.Replace the String with a Substrng
5.Size of the String
6.Find substring in a String
7.Display the String
8.Exit
Enter your Choice: 2
Position after which substring to be erased: 5
Length of the substring to be deleted: 7
 
---------------------
String Implementation in Stl
 
---------------------
1.Insert Substring in a String
2.Erase Substring from a String
3.Append Substring to a String
4.Replace the String with a Substrng
5.Size of the String
6.Find substring in a String
7.Display the String
8.Exit
Enter your Choice: 7
This is a Test String.
 
---------------------
String Implementation in Stl
 
---------------------
1.Insert Substring in a String
2.Erase Substring from a String
3.Append Substring to a String
4.Replace the String with a Substrng
5.Size of the String
6.Find substring in a String
7.Display the String
8.Exit
Enter your Choice: 3
 
---------------------
String Implementation in Stl
 
---------------------
1.Insert Substring in a String
2.Erase Substring from a String
3.Append Substring to a String
4.Replace the String with a Substrng
5.Size of the String
6.Find substring in a String
7.Display the String
8.Exit
Enter your Choice: 7
This is a Test String. This is an appended string.
 
---------------------
String Implementation in Stl
 
---------------------
1.Insert Substring in a String
2.Erase Substring from a String
3.Append Substring to a String
4.Replace the String with a Substrng
5.Size of the String
6.Find substring in a String
7.Display the String
8.Exit
Enter your Choice: 4
 
---------------------
String Implementation in Stl
 
---------------------
1.Insert Substring in a String
2.Erase Substring from a String
3.Append Substring to a String
4.Replace the String with a Substrng
5.Size of the String
6.Find substring in a String
7.Display the String
8.Exit
Enter your Choice: 7
This is an example String. This is an appended string.
 
---------------------
String Implementation in Stl
 
---------------------
1.Insert Substring in a String
2.Erase Substring from a String
3.Append Substring to a String
4.Replace the String with a Substrng
5.Size of the String
6.Find substring in a String
7.Display the String
8.Exit
Enter your Choice: 5
Size of the string: 54
 
---------------------
String Implementation in Stl
 
---------------------
1.Insert Substring in a String
2.Erase Substring from a String
3.Append Substring to a String
4.Replace the String with a Substrng
5.Size of the String
6.Find substring in a String
7.Display the String
8.Exit
Enter your Choice: 6
Enter substring to be found: string
Substring string found at 47
 
---------------------
String Implementation in Stl
 
---------------------
1.Insert Substring in a String
2.Erase Substring from a String
3.Append Substring to a String
4.Replace the String with a Substrng
5.Size of the String
6.Find substring in a String
7.Display the String
8.Exit
Enter your Choice: 8
 
 
------------------
(program exited with code: 1)
Press return to continue