Queue operations in c

Question

In this code when I enter 2 and then 4 as operations,I should get "QUEUE:empty" as output but I am getting "QUEUE:4"
https://code.sololearn.com/cmn2791CcY93/?ref=app

Answer 1

Pretty sure line 87:

if((front && rear)==-1)

should be

if(front==-1 && rear==-1)

Answer 2

actually it should be if((front==-1 && rear==-1) || (front > rear))
You have to compare front and rear each time because you don't reset them immediately after front + 1.