# ECE 4122/6122 Hmk #1

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ECE 4122/6122 Hmk #1 (100 pts)
Problem 1: One more One
(www.projecteuler.net) Consider the following process that can be applied recursively to any
positive integer n:
• if n=1, do nothing and the process stops,
• if n is divisible by 7, divide it by 7,
The write a console program that takes in a number n from the console and outputs to the
console the number of 1’s that must be added to the positive integer n before the process
above ends.
Sample Sequence:
125
+1
�� 126
÷7
�� 18
+1
�� 19
+1
�� 20
+1
�� 21
÷7
�� 3
+1
�� 4
+1
�� 5
+1
�� 6
+1
�� 7
÷7
�� 1
Example Input:
Please enter the starting number n: 125
4
Problem 2: Numerical Integration
Write a console program to numerically calculate the value of the following integral, using the
“midpoint” rule.
� 4
(1 + 𝑥𝑥2)
𝑑𝑑𝑑𝑑
𝛽𝛽
0
The program should ask the user to enter β (type double) and the number of subdivisions, N
(type unsigned long) on separate lines. The value (type double) of the integral should be
displayed on the following line.
Example Input:
Please enter a value for the upper limit (beta): 1.0
Please enter the number of subdivisions to use: 10000000
When β =1.0 the integral is equal to π. Your answer should approach the exact value of π as N
increases.
Midpoint Rule:
The integral is equal to the area underneath the function from 0 to β. We can approximate the
integral as the sum of the area of rectangles. The height of the rectangle is F(x) at the midpoint
of the rectangle and the width is ∆𝑥𝑥 as shown below.
� 𝐹𝐹(𝑥𝑥)𝑑𝑑𝑑𝑑 ≅ �𝐹𝐹(𝑥𝑥𝑖𝑖) ∗ ∆𝑥𝑥
𝑁𝑁
1
5
Problem 3 (ECE 6122 students only):
(www.projecteuler.net) The Knights of the Order of Fibonacci are preparing a grand feast for
their king. There are n knights, and each knight is assigned a distinct number from 1 to n.
When the knights sit down at the roundtable for their feast, they follow a peculiar seating rule:
two knights can only sit next to each other if their respective numbers sum to a Fibonacci
number.
When the n knights all try to sit down around a circular table with n chairs, they are unable to
find a suitable seating arrangement for any n > 2 despite their best efforts. Just when they are
about to give up, they remember that the king will sit on his throne at the table as well.
Suppose there are n = 7 knights and 7 chairs at the roundtable, in addition to the king’s throne.
After some trial and error, they come up with the following seating arrangement (K represents
the king):
Following the rules above, write a console program that prompts the user for the number of
knights, n (type unsigned long). The program then determines if the rules above can be
satisfied. If a solution is found, then output to the console the solution in a clockwise fashion
starting with the king. If no solution is possible then output “No solution found!”
Please enter the number of knights: 7
The knights should sit clockwise as follows: K, 4, 1, 7, 6, 2, 3, 5
6
Appendix A: Coding Standards
Indentation:
When using if/for/while statements, make sure you indent 4 spaces for the content inside those. Also
make sure that you use spaces to make the code more readable.
For example:
for (int i; i < 10; i++)
{
j = j + i;
}
If you have nested statements, you should use multiple indentions. Each { should be on its own line (like
the for loop) If you have else or else if statements after your if statement, they should be on their own
line.
for (int i; i < 10; i++)
{
if (i < 5)
{
counter++;
k -= i;
}
else
{
k +=1;
}
j += i;
}
Camel Case:
This naming convention has the first letter of the variable be lower case, and the first letter in each new
word be capitalized (e.g. firstSecondThird). This applies for functions and member functions as well! The
main exception to this is class names, where the first letter should also be capitalized.
Variable and Function Names:
Your variable and function names should be clear about what that variable or function is. Do not use one
letter variables, but use abbreviations when it is appropriate (for example: “imag” instead of
will be. This is the idea behind self-documenting code.
7
Every file should have the following header at the top
/*
Class: ECE4122 or ECE6122
Last Date Modified: <date>
Description:
What is the purpose of this file?
*/
1. Every function must have a comment section describing the purpose of the function, the input
and output parameters, the return value (if any).
2. Every class must have a comment section to describe the purpose of the class.
3. Comments need to be placed inside of functions/loops to assist in the understanding of the flow
of the code.
8
Appendix B: Accessing PACE-ICE Instructions
ACCESSING LINUX PACE-ICE CLUSTER (SERVER)
To access the PACE-ICE cluster you need certain software on your laptop or desktop system, as described
below.
Windows Users:
Option 0 (Using SecureCRT)- THIS IS THE EASIEST OPTION!
The Georgia Tech Office of Information Technology (OIT) maintains a web page of software that can be
http://software.oit.gatech.edu
From that page you will need to install SecureCRT.
then answer a series of questions regarding export controls.
Connecting using SecureCRT should be easy.
• Open SecureCRT, you’ll be presented with the “Quick Connect” screen.
• Choose protocol “ssh2”.
• Enter the name of the CoC machine you wish to connect to in the “HostName” box (i.e.
coc-ice.pace.gatech.edu)
• Click “Connect”.
• A new window will open, and you’ll be prompted for your password.
Option 1 (Using Ubuntu for Windows 10):
Option 1 uses the Ubuntu on Windows program. This can only be downloaded if you are running
Windows 10 or above. If using Windows 8 or below, use Options 2 or 3. It also requires the use of simple
bash commands.
1. Install Ubuntu for Windows 10 by following the guide from the following link:
https://msdn.microsoft.com/en-us/commandline/wsl/install-win10
2. Once Ubuntu for Windows 10 is installed, open it and type the following into the command line:
3. When it asks if you’re sure you want to connect, type in:
yes
9
any characters typing)
4. You’re now connected to PACE-ICE. You can edit files using vim by typing in:
vi filename.cc OR nano vilename.cpp
For a list of vim commands, use the following link:
5. You’re able to edit, compile, run, and submit your code from this command line.
Option 2 (Using PuTTY):
Option 2 uses a program called PuTTY to ssh into the PACE-ICE cluster. It is easier to set up, but doesn’t
allow you to access any local files from the command line. It also requires the use of simple bash
commands.
2. Once installed, open PuTTY and for the Host Name, type in:
coc-ice.pace.gatech.edu and
for the port, leave it as 22.
3. Click Open and a window will pop up asking if you trust the host. Click Yes and it will then ask
characters typing)
4. You’re now connected to PACE-ICE. You can edit files using vim by typing in: vim filename.cc
OR nano vilename.cpp
For a list of vim commands, use the following link:
5. You’re able to edit, compile, run, and submit your code from this command line.
MacOS Users:.
Option 0 (Using the Terminal to SSH into PACE-ICE):
10
This option uses the built-in terminal in MacOS to ssh into PACE-ICE and use a command line text editor
1. Open Terminal from the Launchpad or Spotlight Search.
2. Once you’re in the terminal, ssh into PACE-ICE by typing:
3. When it asks if you’re sure you want to connect, type in:
yes