C++ Programming Code Examples

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C++ Program to Implement String in STL



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 = "Happy Codings - C++ Programming Language Code Examples.";

        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;

    }