// You have shown enough effort for me to help you rewrite this
// We will use standard headers and not the deprecated ones you were using.
// I am assuming you are running under a windows OS so we can use a few
// facilities provided by the OS to do things like clearing the screen.

#include<iostream>
#include<iomanip>
#include<string>
#include<limits>
#include<cstdlib>
#include<windows.h>
// windows.h defines a max macro that will make our life hell so we undef it
#undef max

// the functions and objects in the standard headers are all declared within namespace
// std. We will bring them all into the global scope so we dont have to prefix everything
// with std:: with this simple line.
using namespace std;

// here is how to clear the screen on a windows console. You do not need to
// necessarily understand this to use it.Suffice to say that a call to this
// will clear the screen and reset the cursor pos to the top left corner.
void clrscr()
{
    COORD                       coordScreen = { 0, 0 };
    DWORD                       cCharsWritten;
    CONSOLE_SCREEN_BUFFER_INFO  csbi;
    DWORD                       dwConSize;
    HANDLE                      hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
    GetConsoleScreenBufferInfo(hConsole, &csbi);
    dwConSize = csbi.dwSize.X * csbi.dwSize.Y;
    FillConsoleOutputCharacter(hConsole, TEXT(' '), dwConSize, coordScreen, &cCharsWritten);
    GetConsoleScreenBufferInfo(hConsole, &csbi);
    FillConsoleOutputAttribute(hConsole, csbi.wAttributes, dwConSize, coordScreen, &cCharsWritten);
    SetConsoleCursorPosition(hConsole, coordScreen);
}

// Lets introduce a struct to represent our seats. A struct is an aggregate type made up
// of smaller types.
// You declare one like so :-
// struct STRUCTNAME { members };
// you make an object of your struct like declaring an int.
// STRUCTNAME obj;
// You access the members with the dot operator like so...
// struct mystruct{inta;intb;};
// mystruct astruct;
// astruct.a = 0;astruct.b = 0;
struct Seat
{
   string seattype;
   float seatprice;
   int row;
   int seatnumber;
   bool taken; // a bool has 2 states true and false. When this is true the seat is taken
};

// Now we will make a global array of seats to represent the plane.
// We will use this all over the place so global as a convenience.
// There are 12 rows of 4 seats so...
Seat seatmap[12][4];

// Lets write a function to get the prices of seats
float GetInput(string s)
{
   cout<<s;
   float input;
   while (!(cin>>input))
   {
      cerr<<endl<<"error! re-enter"<<endl;
      cin.clear();
      cin.ignore(numeric_limits<streamsize>::max(),'\n');
   }
   return input;
}

// armed with that we can write a function to initalise the seatmap
void InitSeatMap()
{
   float Legroomprice = GetInput(string("Enter cost of a leg-room seat ? "));
   float Windowprice = GetInput(string("Enter cost of a window seat ? "));
   float Aisleprice = GetInput(string("Enter cost of an aisle seat ? "));
   for (int i=0;i<12;++i)
      for(int j=0;j<4;++j)
      {
         seatmap[i][j].row = i+1;
         seatmap[i][j].seatnumber = j+1;
         seatmap[i][j].taken = false; // no seat is taken yet
         if (i==0) // legroom seats
         {
            seatmap[i][j].seattype = "legroom";
            seatmap[i][j].seatprice = Legroomprice;
         }
         if((i != 0) && (j==0 || j==3)) // we have a windowseat
         {
            seatmap[i][j].seattype = "window";
            seatmap[i][j].seatprice = Windowprice;
         }
         if((i != 0) && (j==1 || j==2)) // we have an aisle seat
         {
            seatmap[i][j].seattype = "aisle";
            seatmap[i][j].seatprice = Aisleprice;
         }
      }
}

// now we can write a function to allocate a seat
void AllocSeat(string type)
{
   for(int i=0;i<12;++i)
      for(int j=0;j<4;++j)
      {
         if (seatmap[i][j].seattype == type && !seatmap[i][j].taken)
         {
            seatmap[i][j].taken = true; // seats free so allocate it taken
            cout<<endl<<"Seat allocated. Row :- "<<seatmap[i][j].row<< "Seatnumber :- "<<seatmap[i][j].seatnumber<<endl;
            return;
         }
      }
   cout<<endl<<"Sorry but that type of seat is not available!!!"<<endl;
}

// an overload to take a specific seat
void AllocSeat(int row, int seatnum)
{
   if (!seatmap[row-1][seatnum-1].taken)
   {
      seatmap[row-1][seatnum-1].taken = true;
      cout<<endl<<"Seat allocated."<<endl;
      return;
   }
   cout<<endl<<"Sorry but that particular seat is already taken!!!"<<endl;
}

void Menu()
{
   clrscr();
   cout<<"1 - View available seats"<<endl
      <<"2 - View seating prices"<<endl
      <<"3 - View ticket sales"<<endl
      <<"4 - Purchase a ticket"<<endl
      <<"5 - Quit"<<endl;
}

void DisplaySeatMap()
{
   clrscr();
   for (int i=0;i<12;++i)
      for (int j=0;j<4;++j)
      {
         if (!i && !j)
         {
            cout<<"  "<<setw(3)<<1<<setw(3)<<2<<setw(3)<<3<<setw(3)<<4<<endl;
         }
         if (j==0)
         {
            cout<<setw(4)<<left<<seatmap[i][j].row;
         }
         if (seatmap[i][j].seattype == "legroom")
         {
            cout <<setw(3)<<left<<((seatmap[i][j].taken) ? "*" : "L");
         }
         if (seatmap[i][j].seattype == "window")
         {
            cout <<setw(3)<<left<<((seatmap[i][j].taken) ? "*" : "W");
         }
         if (seatmap[i][j].seattype == "aisle")
         {
            cout <<setw(3)<<left<<((seatmap[i][j].taken) ? "*" : "A");
         }
         if (j==3)
            cout<<endl;
      }
   system("PAUSE"); // lousy but just what we need
}

void PurchaseSeat()
{
   // offer pick a seat or type of seat.
   // call correct AllocSeat
   // display cost
}

void DisplaySales()
{
   int sales[3]={0};
   for (int i=0;i<12;++i)
      for (int j=0;j<4;++j)
      {
         if (seatmap[i][j].seattype == "legroom" && seatmap[i][j].taken)
         {
            ++sales[0];
         }
         if (seatmap[i][j].seattype == "window" && seatmap[i][j].taken)
         {
            ++sales[1];
         }
         if (seatmap[i][j].seattype == "aisle" && seatmap[i][j].taken)
         {
            ++sales[2];
         }
      }
   clrscr();
   cout<<"Legroom seats sold :- "<<sales[0]<<" at $"<<seatmap[0][0].seatprice<<endl
      <<"Window seats sold :- "<<sales[1]<<" at $"<<seatmap[1][0].seatprice<<endl
      <<"Aisle seats sold :- "<<sales[2]<<" at $"<<seatmap[1][1].seatprice<<endl;
   double revenue = (sales[0] * seatmap[0][0].seatprice) + (sales[1] * seatmap[1][0].seatprice)
      + (sales[2] * seatmap[1][1].seatprice);
   cout<<"Total revenues for this flight are $"<<revenue<<endl;
   system("PAUSE");
}

void DisplayPricing()
{
   clrscr();
   cout << "Legroom seat :- $"<<seatmap[0][0].seatprice<<endl
      <<"Window seat :- $"<<seatmap[1][0].seatprice<<endl
      <<"Aisle seat :- $"<<seatmap[1][1].seatprice<<endl;
   system("PAUSE"); // lousy but does the job
}


int main()
{
   InitSeatMap();
   while(1) // infinite loop
   {
      Menu();
      cout<<"Enter choice :- ";
      int input;
      while (!(cin>>input) || input<0 || input>5)
      {
         cerr<<endl<<"error! re-enter"<<endl;
         cin.clear();
         cin.ignore(numeric_limits<streamsize>::max(),'\n');
      }
      switch(input)
      {
         case 1:  DisplaySeatMap();
                  break;
         case 2:  DisplayPricing();
                  break;
         case 3:  DisplaySales();
                  break;
         case 4:  PurchaseSeat();
                  break;
         case 5:  cout<<"Exiting.........Goodbye!!!"<<endl;
                  Sleep(2000); // a small wait of 2 secs
                  return 0;
      }
   }
}

// You have shown enough effort for me to help you rewrite this
// We will use standard headers and not the deprecated ones you were using.
// I am assuming you are running under a windows OS so we can use a few
// facilities provided by the OS to do things like clearing the screen.

#include<iostream>
#include<iomanip>
#include<string>
#include<limits>
#include<cstdlib>
#include<windows.h>
// windows.h defines a max macro that will make our life hell so we undef it
#undef max

// the functions and objects in the standard headers are all declared within namespace
// std. We will bring them all into the global scope so we dont have to prefix everything
// with std:: with this simple line.
using namespace std;

// here is how to clear the screen on a windows console. You do not need to
// necessarily understand this to use it.Suffice to say that a call to this
// will clear the screen and reset the cursor pos to the top left corner.
void clrscr()
{
    COORD                       coordScreen = { 0, 0 };
    DWORD                       cCharsWritten;
    CONSOLE_SCREEN_BUFFER_INFO  csbi;
    DWORD                       dwConSize;
    HANDLE                      hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
    GetConsoleScreenBufferInfo(hConsole, &csbi);
    dwConSize = csbi.dwSize.X * csbi.dwSize.Y;
    FillConsoleOutputCharacter(hConsole, TEXT(' '), dwConSize, coordScreen, &cCharsWritten);
    GetConsoleScreenBufferInfo(hConsole, &csbi);
    FillConsoleOutputAttribute(hConsole, csbi.wAttributes, dwConSize, coordScreen, &cCharsWritten);
    SetConsoleCursorPosition(hConsole, coordScreen);
}

// Lets introduce a struct to represent our seats. A struct is an aggregate type made up
// of smaller types.
// You declare one like so :-
// struct STRUCTNAME { members };
// you make an object of your struct like declaring an int.
// STRUCTNAME obj;
// You access the members with the dot operator like so...
// struct mystruct{inta;intb;};
// mystruct astruct;
// astruct.a = 0;astruct.b = 0;
struct Seat
{
   string seattype;
   float seatprice;
   int row;
   int seatnumber;
   bool taken; // a bool has 2 states true and false. When this is true the seat is taken
};

// Now we will make a global array of seats to represent the plane.
// We will use this all over the place so global as a convenience.
// There are 12 rows of 4 seats so...
Seat seatmap[12][4];

// Lets write a function to get the prices of seats
float GetInput(string s)
{
   cout<<s;
   float input;
   while (!(cin>>input))
   {
      cerr<<endl<<"error! re-enter"<<endl;
      cin.clear();
      cin.ignore(numeric_limits<streamsize>::max(),'\n');
   }
   return input;
}

// armed with that we can write a function to initalise the seatmap
void InitSeatMap()
{
   float Legroomprice = GetInput(string("Enter cost of a leg-room seat ? "));
   float Windowprice = GetInput(string("Enter cost of a window seat ? "));
   float Aisleprice = GetInput(string("Enter cost of an aisle seat ? "));
   for (int i=0;i<12;++i)
      for(int j=0;j<4;++j)
      {
         seatmap[i][j].row = i+1;
         seatmap[i][j].seatnumber = j+1;
         seatmap[i][j].taken = false; // no seat is taken yet
         if (i==0) // legroom seats
         {
            seatmap[i][j].seattype = "legroom";
            seatmap[i][j].seatprice = Legroomprice;
         }
         if((i != 0) && (j==0 || j==3)) // we have a windowseat
         {
            seatmap[i][j].seattype = "window";
            seatmap[i][j].seatprice = Windowprice;
         }
         if((i != 0) && (j==1 || j==2)) // we have an aisle seat
         {
            seatmap[i][j].seattype = "aisle";
            seatmap[i][j].seatprice = Aisleprice;
         }
      }
}

// now we can write a function to allocate a seat
void AllocSeat(string type)
{
   for(int i=0;i<12;++i)
      for(int j=0;j<4;++j)
      {
         if (seatmap[i][j].seattype == type && !seatmap[i][j].taken)
         {
            seatmap[i][j].taken = true; // seats free so allocate it taken
            cout<<endl<<"Seat allocated. Row :- "<<seatmap[i][j].row<< "  Seatnumber :- "<<seatmap[i][j].seatnumber<<endl;
            cout<<"Cost of seat is $"<<seatmap[i][j].seatprice<<endl;
            return;
         }
      }
   cout<<endl<<"Sorry but that type of seat is not available!!!"<<endl;
}

// an overload to take a specific seat
void AllocSeat(int row, int seatnum)
{
   if (!seatmap[row-1][seatnum-1].taken)
   {
      seatmap[row-1][seatnum-1].taken = true;
      cout<<endl<<"Seat allocated."<<endl;
      cout<<"Cost of seat is $"<<seatmap[row-1][seatnum-1].seatprice<<endl;
      return;
   }
   cout<<endl<<"Sorry but that particular seat is already taken!!!"<<endl;
}

void Menu()
{
   clrscr();
   cout<<"1 - View available seats"<<endl
      <<"2 - View seating prices"<<endl
      <<"3 - View ticket sales"<<endl
      <<"4 - Purchase a ticket"<<endl
      <<"5 - Quit"<<endl;
}

void DisplaySeatMap()
{
   clrscr();
   for (int i=0;i<12;++i)
      for (int j=0;j<4;++j)
      {
         if (!i && !j)
         {
            cout<<"  "<<setw(3)<<1<<setw(3)<<2<<setw(3)<<3<<setw(3)<<4<<endl;
         }
         if (j==0)
         {
            cout<<setw(4)<<left<<seatmap[i][j].row;
         }
         if (seatmap[i][j].seattype == "legroom")
         {
            cout <<setw(3)<<left<<((seatmap[i][j].taken) ? "*" : "L");
         }
         if (seatmap[i][j].seattype == "window")
         {
            cout <<setw(3)<<left<<((seatmap[i][j].taken) ? "*" : "W");
         }
         if (seatmap[i][j].seattype == "aisle")
         {
            cout <<setw(3)<<left<<((seatmap[i][j].taken) ? "*" : "A");
         }
         if (j==3)
            cout<<endl;
      }
   system("PAUSE"); // lousy but just what we need
}

bool Valid(char c)
{
   c = tolower(c);
   if( c == 'a' || c == 'w' || c == 'l')
      return true;
   else
      return false;
}

void PurchaseSeat()
{
   clrscr();
   cout<<"Do you wish to pick a particular seat(Y/N) ? ";
   char input;
   while(!(cin>>input))
   {
      cerr<<endl<<"error! re-enter"<<endl;
      cin.clear();
      cin.ignore(numeric_limits<streamsize>::max(),'\n');
   }
   if (tolower(input) == 'y')
   {
      int row,seatnum;
      cout<<"Enter row followed by a space then seat number :- ";
      while (!(cin>>row>>seatnum) || row<1 || row>12 || seatnum<1 || seatnum>4)
      {
         cerr<<endl<<"error! re-enter"<<endl;
         cin.clear();
         cin.ignore(numeric_limits<streamsize>::max(),'\n');
      }
      AllocSeat(row,seatnum);
   }
   else
   {
      cout<<endl<<"What type of seat would you like (W,L,A) ? ";
      while(!(cin>>input) || !Valid(input))
      {
         cerr<<endl<<"error! re-enter"<<endl;
         cin.clear();
         cin.ignore(numeric_limits<streamsize>::max(),'\n');
      }
      string type;
      if(tolower(input) == 'l')
      {
         type = "legroom";
      }
      else if(tolower(input) == 'w')
      {
         type = "window";
      }
      else
      {
         type = "aisle";
      }
      AllocSeat(type);
      system("PAUSE");
   }
}

void DisplaySales()
{
   int sales[3]={0};
   for (int i=0;i<12;++i)
      for (int j=0;j<4;++j)
      {
         if (seatmap[i][j].seattype == "legroom" && seatmap[i][j].taken)
         {
            ++sales[0];
         }
         if (seatmap[i][j].seattype == "window" && seatmap[i][j].taken)
         {
            ++sales[1];
         }
         if (seatmap[i][j].seattype == "aisle" && seatmap[i][j].taken)
         {
            ++sales[2];
         }
      }
   clrscr();
   cout<<"Legroom seats sold :- "<<sales[0]<<" at $"<<seatmap[0][0].seatprice<<endl
      <<"Window seats sold :- "<<sales[1]<<" at $"<<seatmap[1][0].seatprice<<endl
      <<"Aisle seats sold :- "<<sales[2]<<" at $"<<seatmap[1][1].seatprice<<endl;
   double revenue = (sales[0] * seatmap[0][0].seatprice) + (sales[1] * seatmap[1][0].seatprice)
      + (sales[2] * seatmap[1][1].seatprice);
   cout<<"Total revenues for this flight are $"<<revenue<<endl;
   system("PAUSE");
}

void DisplayPricing()
{
   clrscr();
   cout << "Legroom seat :- $"<<seatmap[0][0].seatprice<<endl
      <<"Window seat :- $"<<seatmap[1][0].seatprice<<endl
      <<"Aisle seat :- $"<<seatmap[1][1].seatprice<<endl;
   system("PAUSE"); // lousy but does the job
}


int main()
{
   InitSeatMap();
   while(1) // infinite loop
   {
      Menu();
      cout<<"Enter choice :- ";
      int input;
      while (!(cin>>input) || input<1 || input>5)
      {
         cerr<<endl<<"error! re-enter"<<endl;
         cin.clear();
         cin.ignore(numeric_limits<streamsize>::max(),'\n');
      }
      switch(input)
      {
         case 1:  DisplaySeatMap();
                  break;
         case 2:  DisplayPricing();
                  break;
         case 3:  DisplaySales();
                  break;
         case 4:  PurchaseSeat();
                  break;
         case 5:  cout<<"Exiting.........Goodbye!!!"<<endl;
                  Sleep(2000); // a small wait of 2 secs
                  return 0;
      }
   }
}