Added Queue in c++

Author: himabindu-run

queue/Queue_Good_code.cpp

@@ -0,0 +1,76 @@
+#include <iostream>
+
+using namespace std;
+
+int queue[100], size, front, rear;
+
+void enqueue(int);
+void display();
+void dequeue();
+
+int main(){
+ int choice, element;
+ front = 0, rear = 0;
+ cout << "Enter size of the queue:";
+ cout << "\n";
+ cin >> size;
+ cout << "Enter your choice: \n 0.Exit \n 1.Enqueue \n 2.Dequeue \n 3.Display\n\n";
+ cin >> choice;
+ 
+ while(choice != 0) {
+ switch(choice) {
+ case 0:
+ exit(0);
+ 
+ case 1:
+ if(rear == size){
+ cout << "Queue overflow :(\n";
+ exit(0);
+ }
+ cout << "Enter the element you want to add to the queue\n";
+ cin >> element;
+ enqueue(element);
+ break;
+ 
+ case 2:
+ if(rear == front)
+ {
+ cout << "Queue underflow :|";
+ exit(0);
+ }
+ dequeue();
+ break;
+ 
+ case 3:
+ display();
+ break;
+ }
+ 
+ cout << "\n Enter your choice: \n0.Exit \n1.Enqueue\n2.Dequeue\n3.Display\n\n";
+ cin >> choice;
+ }
+}
+
+void enqueue(int element){
+ int i,j;
+ i = 0;
+ while(queue[i]!=0)
+ {
+ i++;
+ }
+ queue[i] = element;
+ rear = i + 1;
+}
+
+void dequeue(){
+ front++;
+}
+
+void display(){
+ cout << "\nElements are:\n";
+ for(int i = front; i < rear; i++){
+ cout << queue[i] << " ";
+ }
+}
+
+