Upload files to "DS/C/endsem-omnibus"

DS/C/endsem-omnibus/circq.c

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+#include <stdio.h>
+#include <stdlib.h>
+#define MAX 5
+
+int queue[MAX];
+int front = -1;
+int rear = -1;
+
+// Different from normal queue: Need to check if (rear+1)%MAX == front for full condition
+int isFull() {
+    if((rear + 1) % MAX == front)
+        return 1;
+    return 0;
+}
+
+// Different from normal queue: Both front and rear can wrap around to 0
+int isEmpty() {
+    if(front == -1)
+        return 1;
+    return 0;
+}
+
+void enqueue() {
+    int item;
+    if(isFull()) {
+        printf("\nQueue is Full!!");
+    }
+    else {
+        printf("\nEnter element to insert: ");
+        scanf("%d", &item);
+        // Different from normal queue: rear wraps around using modulo
+        if(front == -1) {
+            front = rear = 0;
+        }
+        else {
+            rear = (rear + 1) % MAX;
+        }
+        queue[rear] = item;
+        printf("\nElement inserted successfully!");
+    }
+}
+
+void dequeue() {
+    if(isEmpty()) {
+        printf("\nQueue is Empty!!");
+    }
+    else {
+        printf("\nDeleted element is: %d", queue[front]);
+        // Different from normal queue: front wraps around using modulo
+        if(front == rear) {
+            front = rear = -1;
+        }
+        else {
+            front = (front + 1) % MAX;
+        }
+    }
+}
+
+void display() {
+    int i;
+    if(isEmpty()) {
+        printf("\nQueue is Empty!!");
+    }
+    else {
+        printf("\nQueue elements are: ");
+        // Different from normal queue: Need to use modulo to wrap around while displaying
+        for(i = front; i != rear; i = (i + 1) % MAX) {
+            printf("%d ", queue[i]);
+        }
+        printf("%d", queue[i]);
+    }
+}
+
+int main() {
+    int choice;
+    while(1) {
+        printf("\n\n1. Insert");
+        printf("\n2. Delete");
+        printf("\n3. Display");
+        printf("\n4. Exit");
+        printf("\nEnter your choice: ");
+        scanf("%d", &choice);
+
+        switch(choice) {
+            case 1:
+                enqueue();
+                break;
+            case 2:
+                dequeue();
+                break;
+            case 3:
+                display();
+                break;
+            case 4:
+                exit(0);
+            default:
+                printf("\nInvalid choice!!");
+        }
+    }
+    return 0;
+}