7th

#include <iostream>
#include <string.h>

using namespace std;

int gr, i, cnt = 0;
char textn [256], sm;
bool lst = false, fst = false;
char * sd;

int main ()
{
    cout << "Enter text : ";
       cin.getline (tkst, 256);
    cout << endl;

    cout << "New text : ";

    for (int i = 0; i <strlen (textn); i ++)
    {
        if (strlen (textn) - 1> i && i> 0)
            cout << textn [i];
        if (i == 0 || i == strlen (textn) - 1)
            cout << "-";
    }
    cout << endl;

// 2

    cout << "Enter text : ";
       cin.getline (tkst, 256);
     sd = strtok (textn, "-;:,.! / @ &");

     while (sd != NULL)
     {
         cnt ++;
         sd = strtok (NULL, "-;:,.! / @ &");
     }
     cout << '\n'
          << "Words = " << cnt << endl;

     cout << endl;
cnt = 0;

// 3

    cout << "Enter text : ";
       cin.getline (tkst, 256);
     for (i = 0; textn [i] != '\0'; i ++)
     {
         while (textn [i] != ' ' && textn [i] != '\0')
         {
             if (fst == false)
             {
                 sm = textn [i];
             }
             i ++;
             fst = true;
         }
         if (textn [i] == ' ' || textn [i] == '\0')
         {
             lst = true;
         }
         if (lst == true)
         {
             if (textn [i - 1] == sm)
             {
                 cnt ++;
             }
         }
         lst = false;
         fst = false;
     }
     cout << "Words = " << cnt << endl;
     cout << endl;
cnt = 0;

//4

    cout << "Enter text : ";
       cin.getline (tkst, 256);
    cout << "Symbol : ";
    cin >> sm;
     for (i = 0; textn[i] != '\0'; i++)
       {
           while (textn[i] != ' ' && textn[i] != '\0')
           {
               i++;
           }
           if (textn[i] == ' ' || textn[i] == '\0')
           {
               lst = true;
           }
           if (lst == true)
           {
               if (textn[i - 1] == sm)
               {
                   cnt++;
               }
           }
           lst = false;
       }
     cout << "Words =" << cnt << endl;
   cin.ignore();
     cout << endl;

//5

    cout << "Enter text : ";
       cin.getline (tkst, 256);
    cout << "Symbol : ";
    cin >> sm;

    for (i = 0; textn[i] != '\0'; i++)
    {
        while (textn[i] != ' ' && textn[i] != '\0')
        {
            if (textn[i] == sm)
            {
                gr = i;
                while (textn[gr] != '\0')
                {
                    textn[gr] = textn[gr + 1];
                    gr++;
                }
            }
            if (textn[i] != sm)
                i++;
        }
    }

    cout << "Text after removing = " << textn << endl;

    cout << endl;
   delete [] sd;
    cin.get();
    system("pause");
    return 0;
}