Data Structures
Draw memory call stack to show how recursion works in memory.
Recursive functions use something called “the call stack.” When a program calls a function, that function goes on top of the call stack. This similar to a stack of books. You add things one at a time. Then, when you are ready to take something off, you always take off the top item.
I will show you the call stack in action with the factorial function. factorial(5) is written as 5! and it is defined like this: 5! = 5 * 4 * 3 * 2 * 1. Here is a recursive function to calculate the factorial of a number:
function fact(x) { if (x == 1) { return 1; } else { return x * fact(x-1); } }
Now let’s see what happens if you call fact(3) The illustration bellow shows how the stack changes, line by line. The topmost box in the stack tells you what call to fact you’re currently on.
Notice how each call to fact has its own copy of x. This is very important to making recursion work. You can’t access a different function’s copy of x.
Data Structures Draw memory call stack to show how recursion works in memory.
Call stack question! Long one... The call stack is part of main memory that is reserved for function calling. Like all r memory it is finite, so can be exhausted resulting in a stack overflow. Recursive functions allocate space on the stack for each recursive call: if there are many such recursive calls a stack overflow can result. The questions that follow ask you to investigate recursive functions and stack overflows. Note that when running programs in the Linux terminal...
Data Structures and Algorithm Analysis 7.16 How would you implement mergesort without using recursion?
Show how to implement a stack using two queues. Analyze the running time of the stack operations. Assume that two queues Q1 and Q2 are the only data structures you can use so you shouldn’t need any auxiliary arrays.
Briefly explain HOW THREE BUSES CONNECTED TO MEMORY modules works to write or read data.
A process' memory structure includes... stack pile section text or code data section heap
How can knowing more about how your memory works improve your memory skills? How will this help you in college and in life?What if you start to apply these memory techniques to your other classes?
C++ Data structures and Algorithms Use a Queue to reverse a stack in place. Assume you are given a stack of string values like Stack s; using a Queue, cause all of the items in the stack to be reversed. For example, if you have the following contents on the stack s Top --- bird cat dog turtle ----- Bottom After you run your code, you stack contents should look like Top --- turtle dog cat bird ----- Bottom
Consider how memory works and ways to improve or strengthen memory. You have a lot to remember in college and in life. What memory improving techniques do you use that work for you? What have you learned about in this class that are new techniques you want to try?
Draw a stack diagram to show how the following code is executed and write the generated output. def sequence(n, m): if n < 0: return 1 elif n + m > 5: return sequence(n, m - 1) else: return n * sequence(m - 1, n + 1) print(sequence(5, 3))
Build the following data structures in c++: STACK (Do not use the STL library for your containers, PREFERRED IF YOU USED LINKED LIST OR ARRAYS ) C++ Stack should contain Insertion (Push) Deletion (Pop) Print/Display Clear/empty Size (if empty, print that it’s empty) Fill the stack with 52 values representing cards in a deck, then print a 7-card hand.