Untitled

#include <stdio.h>

int main() {
        int q[100], front = 0, rear = -1;
            int choice, x;

                while (1) {
                            printf("\n1 to enqueue\n");
                                    printf("2 to dequeue\n");
                                            printf("3 to calculate size\n");
                                                    printf("4 to exit\n");
                                                            scanf("%d", &choice);

                                                                    if (choice == 1) {
                                                                                    scanf("%d", &x);
                                                                                                q[++rear] = x;

                                                                                                            printf("Queue - ");
                                                                                                                        for (int i = front; i <= rear; i++)
                                                                                                                                        printf("%d ", q[i]);
                                                                                                                                                    printf("\n");
                                                                    }

                                                                            else if (choice == 2) {
                                                                                            if (front > rear)
                                                                                                            printf("Queue is empty\n");
                                                                                                                        else
                                                                                                                                        front++;
                                                                            }

                                                                                    else if (choice == 3) {
                                                                                                    printf("Size = %d\n", rear - front + 1);
                                                                                    }

                                                                                            else if (choice == 4) {
                                                                                                            break;
                                                                                            }
                }

                    return 0;
}
                                                                                            }
                                                                                    }
                                                                            }
                                                                    }
                }
}