online compiler and debugger for c/c++

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#include <stdio.h> #include <conio.h> #define MAX 10 // Changing this value will change length of array int queue[MAX]; int front = -1, rear = -1; void insert(void); int delete_element(void); int peek(void); void display(void); int main() { int option, val; do { printf("\n\n ***** MAIN MENU *****"); printf("\n 1. Insert an element"); printf("\n 2. Delete an element"); printf("\n 3. Peek"); printf("\n 4. Display the queue"); printf("\n 5. EXIT"); printf("\n Enter your option : "); scanf("%d", & option); switch (option) { case 1: insert(); break; case 2: val = delete_element(); if (val != -1) printf("\n The number deleted is : %d", val); break; case 3: val = peek(); if (val != -1) printf("\n The first value in queue is : %d", val); break; case 4: display(); break; } } while (option != 5); getch(); return 0; } void insert() { int num; printf("\n Enter the number to be inserted in the queue : "); scanf("%d", & num); if (rear == MAX - 1) printf("\n OVERFLOW"); else if (front == -1 && rear == -1) front = rear = 0; else rear++; queue[rear] = num; } int delete_element() { int val; if (front == -1 || front > rear) { printf("\n UNDERFLOW"); return -1; } else { val = queue[front]; front++; if (front > rear) front = rear = -1; return val; } } int peek() { if (front == -1 || front > rear) { printf("\n QUEUE IS EMPTY"); return -1; } else { return queue[front]; } } void display() { int i; printf("\n"); if (front == -1 || front > rear) printf("\n QUEUE IS EMPTY"); else { for (i = front; i <= rear; i++) printf("\t %d", queue[i]); } }

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