What value is stored in num3 after the following pseudocode, where num1, num2, and num3 are integer variables and aQueue is a standard queue?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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C++

What value is stored in num3 after the following pseudocode, where num1, num2, and num3 are integer variables and aQueue is a standard queue? 

num1 = 5
num2 = 1
num3 = 4
aQueue.enqueue(num2)
aQueue.enqueue(num3)
aQueue.dequeue()
aQueue.enqueue(num1 - num2)
num1 = aQueue.peek()
aQueue.dequeue()
num2 = aQueue.peek()
aQueue.dequeue()

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