Program for Priority Queue - Data Structures Source Code in C++

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Home » C++ Home » Data Structures Home » Program for Priority Queue

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Title	Program for Priority Queue
Author	Nunna Santhosh Kumar
Author Email	santu.nunna [at] gmail.com
Description
Category	C++ » Data Structures
Hits	391922
Code	Select and Copy the Code
Code : #include<iostream.h> #include<conio.h> const int MAX=5; class pqueue { int front,rear; public: struct data { int val,p,o; }d[MAX]; pqueue() { front=rear=-1; } void insert(data d1); data deletion(); void display(); }; void pqueue :: insert(data d1) { if(rear==MAX-1) cout<<"Priority Queue is Full "; else { rear++; d[rear]=d1; if(front==-1) front=0; data temp; for(int i=front;i<=rear;i++) for(int j=i+1;j<=rear;j++) { if(d[i].p > d[j].p) { temp=d[i]; d[i]=d[j]; d[j]=temp; } else { if(d[i].p==d[j].p) { if(d[i].o > d[j].o) { temp=d[i]; d[i]=d[j]; d[j]=temp; } } } } } } data pqueue :: deletion() { data d1; if(front==-1) cout<<"Priority Queue is Empty "; else { d1=d[front]; if(front==rear) front=rear=-1; else front++; } return d1; } void pqueue :: display() { if(front==-1) cout<<"Priority Queue is Empty "; else { for(int i=front;i<=rear;i++) { cout<<"Object :"<<i+1<<endl; cout<<"Value ="<<d[i].val<<endl; cout<<"Priority="<<d[i].p<<endl; cout<<"Order = "<<d[i].o<<endl; } } } void main() { pqueue p1; data d1; char op; do { int ch; clrscr(); cout<<"----------Menu------------- "; cout<<"1.Insertion 2.Deletion 3.Display 4.Exit "; cout<<"Enter your Choice<1..4> ?"; cin>>ch; switch(ch) { case 1 : cout<<"Enter Value ?"; cin>>d1.val; cout<<"Enter Priority?"; cin>>d1.p; cout<<"Enter Order ?"; cin>>d1.o; p1.insert(d1); break; case 2 : d1=p1.deletion(); cout<<"Value = "<<d1.val<<endl; cout<<"Priority = "<<d1.p<<endl; cout<<"Order ="<<d1.o<<endl; break; case 3 : p1.display(); break; } cout<<"Do You Want to Continue <Y/N> ?"; cin>>op; }while(op=='Y' \|\| op=='y'); getch(); }

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