HELP!! i'm a 22f, I cant get my program right!!

// CIS251 Programming assignment 5

include <iostream>

include <cmath>

include <string>

include <iomanip>

using namespace std;

int main () { const int MENU = 1, TIP_CAL = 2, END = 3; int choice; string restName = "88 Buffet "; string serverName; const unsigned MAX = 20; const unsigned MIN = 1; int unsigned seed = time(0), tableNumber; srand(seed); tableNumber = (rand() % (MAX - MIN + 1)) + MIN; double bill, tip, ttax, ttip, tamount; double tax = .09; char ch; int day ; int tuesday, wednesday, thursday, friday, saturday, sunday, monday ; double tipPercent; const int TWENTY = 4, EIGHTEEN = 5, FIFTEEN = 6, TWELVE = 7, TEN = 8, OTHER = 9;

cout << "Welcome to 88 Buffet. Please chose an option below. \n"
<< "1. Menu and Pricing. \n"
<< "2. Tip Calculator. \n"
<< "3. End Program. \n\n"
<< "Enter the number you chose here : " << endl;
cin >> choice ; 

switch (choice)
{

case MENU:

cout << "-Sushi Bar        $6.00 \n";
cout << "-Buffet (Adult)   $7.50 \n";
cout << "-Buffet (child)   $4.50 \n";
cout << "-Buffet (Senior)  $5.50 \n";
cout << "-Add Sushi Bar    $2.00 \n";
cout << "-Kids 2 & Under   FREE  \n";
cout << "-All Drinks       $1.29 \n";

cout << "Please Enter What day it is : " << endl;
cin >> day ;

if ( day = monday, tuesday, wednesday)
    cout << "Drinks are Free!\n";
else if ( day = thursday ) 
    cout << "-Thursday Seniors eat for $3.99. \n";
else if ( day = friday, saturday )
    cout << "-Friday and Saturday add sushi bar for $1.00! \n";
else if (day = sunday)
    cout << "-Sundays sushi bar included in Buffet Price! \n";
else 
    cout << "You did not enter a correct day.";


        break;

case TIP_CAL:

cout << restName << endl;
cout <<  "Bill Calculator\n" ;
cout << "Please enter your bill Amount. \n" ;
cin >> bill;
cout << "Your bill amount is " << setw(10) << right << setprecision(2) << fixed << bill << endl;

cout << "Please chose a tip Percentage below.. \n";
    cout << "4-  20% " << endl;
    cout << "5-  18% " << endl;
    cout << "6-  15% " << endl;
    cout << "7-  12% " << endl;
    cout << "8-  10% " << endl;
    cout << "9- Other " << endl;
cin >> tipPercent;

if ( tipPercent = TWENTY )
    tip = .20;
else if ( tipPercent = EIGHTEEN )
    tip = .18;
else if ( tipPercent = FIFTEEN )
    tip = .15;
else if ( tipPercent = TWELVE )
    tip = .12;
else if ( tipPercent= TEN)
    tip = .10;
else 
    tip = OTHER / 100;



ttax =  (tax * bill) ;
cout << "Your tax amount is $" << setw(10) << right << setprecision(2) << fixed <<  ttax << endl;

ttip =  tip * (bill + ttax);
cout << "Your tip amount is $" << setw(10) << right  <<  setprecision(2) << fixed << ttip <<  endl;


tamount =  (bill + ttip + ttax)  ;
cout << "Your total bill is $" << setw(10) << right << setprecision(2) << fixed <<  tamount << endl;

cout << "Server, Enter first and last name separated by a space: \n" ;
getline (cin, serverName);

cin.ignore();

cout << "Thanks for dining with us at " << restName << "!" << endl; 
cout << "Your Table Number is " << tableNumber << endl;
cout << "You were served today by:" << serverName << endl;
cout << "Come back to see us soon! " << endl;

cin.ignore();

cout << "Press any key to contine..... " << endl;
cin.get (ch) ;

cout << "  " << endl;


break; 

case END:

break;

default: cout << "The Choices are 1 through 4, try running the program again. " << endl;

}   

 return 0;

}

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