Introduction to Microservice Architecture Using SpringBoot - Part 1

Write a C program to Implementation of Linear Queue operations like enQueue(), deQueue() and displayQ() using Array 

 #include<stdio.h>  
 #include<stdlib.h>  
 #define MAX 10  
 int queue[MAX];  
 int rear = -1;  
 int front = -1;  
 void enQueue(int x) {  
   if(rear == MAX-1){  
    printf("QUEUE IS FULL");  
    return;  
   }  
   if(rear == -1 && front == -1){  
    front = rear = 0;  
   }  
   else  
    rear++;  
   queue[rear] = x;   
 }  
 int deQueue() {  
   int x;  
   if(front == -1 || front > rear) {  
    printf("QUEUE IS EMPTY");  
    return -1;  
   }  
   return queue[front++];  
 }  
 void displayQ() {  
  int i;  
  for(i=front; i<= rear; i++)  
    printf("%d ", queue[i]);  
 }  
 int main() {  
      int ch, p;  
      while(1){  
           printf("\n 1-> INSERT ");  
           printf("\n 2->DELETE ");  
           printf("\n 3->DISPLAY ");  
           printf("\n 4->EXIT ");  
           scanf("%d",&ch);  
           switch(ch){  
                case 1: printf("ENTER THE ELEMENT TO INSERT = ");  
                           scanf("%d",&p);  
                           enQueue(p);  
                           break;  
                case 2: p = deQueue();  
                          if((front == -1 || front > rear) && p==-1)  
                             break;  
                        else  
                           printf("\nTHE DELETED ELEMENT IS %d",p);  
                           break;  
                case 3: displayQ();  
                          break;  
                case 4: exit(0);  
           }  
      }  
 }  

OUTPUT :