Question

In this assignment, you will implement a simple version of Computer Lab administration system in C++. Your program will monitor computers in 4 computer labs and will allow users to log in and log out. Each computer lab has different number of computers.

•Lab 1 has 10 computers

•Lab 2 has 6 computers

•Lab 3 has 3 computers

•Lab 4 has 12 computers

Here is an example state of the system:

Lab Array

PC1 Free PC2 Free PC3 Free PC4 ack PC5 Free PC6 Free PC7 Mary PC8 Free PC9 Free PC10 Alice Lab 1 PC1 Lab 2 PC2 John PC3 Free PC4 Free PC5 Mike PC6 Free Free PC1 Free PC2 Free PC3 Free Lab 3 PC1 Free PC3 Free PC4 Free PC6 Free PC7 Free PC11 PC2 Tom PC5 Tim PC8 Free PC9 Jimm PC10 Kate PC12 Free Lab 4 Free

Some of the computers are free (no one logged in), and some others are occupied by students.

In the implementation, you will define a Lab array (an array of string pointers) in the stack memory. This pointer array can be local to the main function or it can be a global. And each pointer in the array will point to a string array that is dynamically allocated from the heap memory. (Size of each array is given above)

Initially, all computers in all labs will be set to “Free” state. Then you will provide a menu to the user such as

1)Print the current status of computers in all labs

2)Log in a new student to a computer in a lab

a) Ask user name, the lab number, and the computer number. If it is available, log that student in.

3)Log out a student from his/her computer in a lab

a)Ask user the lab number and the computer number. If the computer is occupied, log that student out.

4)Exit

5)Add N new computers to a lab.

: Here you will ask user the lab number and the how many new computers (N) to add. Then you will add those computers to the lab without losing the current content (logged in students).

Example Case for Menu option 2:

If the current state of the labs as given in first figure, and if a new student “Kim” wants to log in to computer 3 in Lab 3, you will update the corresponding element in the correct array by writing students name. The new state of the labs will be

Another example would be logging out a student from the computers. In that case, the student name will be replaced with the word “Free” in the array.

there should be two ways to logout.

Answer 1

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179

#include <iostream>   #include <string>   #include <vector>   #include <algorithm>   using namespace std;   vector<vector<string> > computerLabs(4);   int sizes[4];   void initialize()   {   computerLabs[0].resize(10, "");   computerLabs[1].resize(6, "");   computerLabs[2].resize(3, "");   computerLabs[3].resize(12, "");   sizes[0] = 10;   sizes[1] = 6;   sizes[2] = 3;   sizes[3] = 12;   }   void print()   {   for(int i=0; i<4; i++){   cout << "Lab " << i+1 << ": ";   for(int j=0; j<sizes[i]; j++){   cout << "PC" << j+1 << ": ";   if(computerLabs[i][j] == "") cout << "Free ";   else cout << computerLabs[i][j] << " ";   }   cout << endl;   }   }   int main()   {   int choice, c, lab, fl = 1;   string name;   initialize();   cout << "Choose option:" << endl;   cout << "1. Print current status of computers in all labs" << endl;   cout << "2. Login in a lab" << endl;   cout << "3. Logout of a computer" << endl;   cout << "4. Exit" << endl;   cout << "5. Add N Computers to a lab" << endl;   while(1){   cout << "Enter choice: ";   cin >> choice;   switch(choice){   case 1: print();   break;   case 2: cout << "Enter name: ";   cin >> name;   cout << "Enter Lab number: ";   cin >> lab;   cout << "Enter Computer number: ";   cin >> c;   if(computerLabs[lab-1][c-1] == ""){   computerLabs[lab-1][c-1] = name;   cout << "Logged in successfully" << endl;   }   else{   cout << "Computer is unavailable" << endl;   }   break;   case 3: cout << "Enter Lab number: ";   cin >> lab;   cout << "Enter Computer number: ";   cin >> c;   if(computerLabs[lab-1][c-1] == ""){   cout << "PC already free" << endl;   }   else{   computerLabs[lab-1][c-1] = "";   cout << "Logged out successfully" << endl;   }   break;   case 4: fl = 0;   break;   case 5: cout << "Enter Lab number: ";   cin >> lab;   cout << "Enter Computers to add: ";   cin >> c;   sizes[lab-1] += c;   computerLabs[lab-1].resize(sizes[lab-1]);   cout << "New PCs added" << endl;   break;   default: cout << "Incorrect Choice" << endl;   break;   }   if(fl == 0) break;   }   return 0;   }