#include <iostream>
#include <vector>
using namespace std;

// In this exercise, we will design an in memory software for a parking system using object oriented programming.

// Overview:
// 1. A parking system consists of n floors, and each floor has m parking spots.
// 2. To enter the premise, driver can press a button which issues a parking ticket. NOTE: No spot is assigned at the time of issuing the ticket.
// 3. To exit the premise, driver can enter his ticket and press a button to exit.

// Feature:
// 1. At entrance, driver can see floor wise availability on signage board: As an example:
// - Floor 1 has 5 out of 30 available
// - Floor 2 has 20 out of 50 available
// - ...

// 2. At the time of exit, driver can see parking charges associated with the ticket.

// enum VehicleClass {
//   two_wheeler,
//   four_wheeler
// }



class ticket {
 public:
  int entryTime;
  int exitTime;
  // VehicleClass class;
};

class parkingFloor {
  int totalAvailable;
  int currentAvailable;
  int floorNumber;
  // std::vector<vehicle> vehicleList;
  
 public:
  parkingFloor (int totalSpots) {
    totalAvailable = totalSpots;
    currentAvailable = totalSpots;
  }
  
  bool getSpot () {
    currentAvailable --;
  } 
  
  void freeSpot() {
    // get vehicle from vehicleList from processing
    currentAvailable ++;
  }
  
  int getAvailable () {
    return currentAvailable;
  }
  
  int getTotalAvailable () {
    return totalAvailable;
  }
};

class parkingSystem {
  int numFloors;
  int spotsPerFloor;
  int totalAvailableSpots;
  int currentAvailableSpots;
  parkingFloor ** floors;
  std::vector<ticket> tickets;
  
 public:
  parkingSystem(int numFloors, int spotsPerFloor) {
    this->numFloors = numFloors;
    this->spotsPerFloor = spotsPerFloor;
    totalAvailableSpots = numFloors * spotsPerFloor;
    currentAvailableSpots = totalAvailableSpots;
    
    floors = (parkingFloor **) malloc(sizeof(parkingFloor *) * numFloors);
    for (int i=0; i<numFloors; i++) {
      floors[i] = new parkingFloor(spotsPerFloor);
    }
  }
  
  // callback from sensor
  void spotOccupied(int floorNum, int spotNum) {
    floors[floorNum]->getSpot();
  }
  
  void spotReleased(int floorNum, int spotNum) {
    floors[floorNum]->freeSpot();
  }
  
  // void newEntry() {
  //   ticket T;
  //   T.entryTime = 1;
  //   tickets.insert(T);
  // }
  
  void displayAvailability () {
    for (int i = 0; i < numFloors; i++) {
      printf("Floor %d has %d out of %d available\n", i+1, floors[i]->getAvailable(), floors[i]->getTotalAvailable());
    }
  }
};

int main() 
{
  parkingSystem ps(3, 5);
  
  ps.spotOccupied(1, 3);
  
  ps.displayAvailability();
    return 0;
}

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Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}