DSL/notes/Unit 6/priorityQueue.cpp

#include<iostream>
#include<string>

#define N 20

#define SERIOUS 10
#define NONSERIOUS 5
#define CHECKUP 1

using namespace std;
string Q[N];
int Pr[N];
int r = -1,f = -1;
void enqueue(string data,int p)//Enqueue function to insert data and its priority in queue
{
	int i;
	if((f==0)&&(r==N-1)) //Check if Queue is full
		cout<<"Queue is full";
	else 
	{
		if(f==-1) 
		{ //if Queue is empty
			f = r = 0;
			Q[r] = data;
			Pr[r] = p;

		}
		else if(r == N-1) 
		{ //if there there is some elemets in Queue
			for(i=f;i<=r;i++) 
			{ 
                    Q[i-f] = Q[i]; 
                    Pr[i-f] = Pr[i];
                    r = r-f; 
                    f = 0;
                    for(i = r;i>f;i--) 
                    {
				        if(p>Pr[i]) 
				        {
					        Q[i+1] = Q[i];
					        Pr[i+1] = Pr[i];
				        }
				        else break;
					
				        Q[i+1] = data;
				        Pr[i+1] = p;
				        r++;
				    }
			}
		}
		
		else 
		{
			for(i = r;i>=f;i--) 
			{
				if(p>Pr[i]) 
				{
					Q[i+1] = Q[i];
					Pr[i+1] = Pr[i];	
				}
				else break;
			}
			Q[i+1] = data;
			Pr[i+1] = p;
			r++;
		}	
	}

}
void print() { //print the data of Queue
	int i;
	for(i=f;i<=r;i++) {
		cout << "Patient's Name - "<<Q[i];
		switch(Pr[i]) {
			case 1: 
				cout << " Priority - 'Checkup' " << endl;
			break;
			case 5:
				cout << " Priority - 'Non-serious' " << endl;
			break;
			case 10:
				cout << " Priority - 'Serious' " << endl;
			break;
			default:
				cout << "Priority not found" << endl;
		}
	}
}

void dequeue() { //remove the data from front
	if(f == -1) 
	{
		cout<<"Queue is Empty";
	}	
	else 
	{
	    cout<<"deleted Element ="<<Q[f]<<endl;
	    cout<<"Its Priority = "<<Pr[f]<<endl;
		if(f==r) f = r = -1;
		else f++;
	}
}

int main() 
{
	string data;
	int opt,n,i,p;
	cout<<"Enter Your Choice:-"<<endl;
	do {
	cout << "\n 1 : Insert the Data in Queue" << endl << "2: Display the Queue " << endl << "3: Delete the data from the Queue" 
		<< endl << "0 for Exit"<< endl;
	cin >> opt;
		switch(opt) {
			case 1:
				cout << "Enter the number of Patient" << endl;
				cin >> n;
				i = 0;
				while(i < n) {
					cout << "Enter your name of the patient : ";
					cin >> data;
					ifnotdoagain: 
						cout << "Enter your Priority (0: serious, 1: non-serious, 2: general checkup) : ";
						cin >> p;
						switch(p) {
							case 0: 
								enqueue(data,SERIOUS);
							break;
							case 1: 
								enqueue(data,NONSERIOUS);
							break;
							case 2: 
								enqueue(data,CHECKUP);
							break;
							default:
								goto ifnotdoagain;
						}
						
					i++;
				}
			break;
			case 2:
				print();
			break;
			case 3:
				 dequeue();
			break;
			case 0:
				cout << "Bye Bye !" << endl;
			break;
			default:
			cout<<"Incorrect Choice"<<endl;

		}
	}while(opt!=0);
        return 0;
}