CSCI 261 - Programming Concepts (C++)Fall 2017 - Lab 1CQuick Links: Canvas | CS @ Mines | Cloud9 | Piazza | zyBooks |
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This lab is due by Tuesday, August 29, 2017 11:59 PM .
Cube"26 rooms high, 26 rooms across, 17,576 possible rooms"The program below computes the volume
of a square prism. I mean it, just one, specific square prism. How
lame! Let's modify this program and make it more versatile.
Before you begin to code, create an empty project and add a new source code, i.e.,
main.cpp
, file; if you don't have down how to do this yet, follow directions in
Lab 1A. Call this project
Lab1C
and copy the code below into the
main.cpp
file within the project. Then update the comment section, and
build/execute the program. Make sure everything runs fine before moving
on to the next step.
Your Task
Your task is three-fold.
First, calculate the volume of a rectangular prism. Change the program below to output the volume of the prism with an appropriate output statement. (Suggestion: do not start the next task until you are happy with the execution of this first task.)
/* CSCI 261 Lab 1C: GEOMETRIC CALCULATIONS
*
* Author: XXXX (_INSERT_YOUR_NAME_HERE_)
*
* Add more complete description here...
*/
// The include section adds extra definitions from the C++ standard library.
#include <iostream> // For cin, cout, etc.
// We will (most of the time) use the standard library namespace in our programs.
using namespace std;
// Must have a function named "main", which is the starting point of a C++ program.
int main() {
/******** MODIFY OR INSERT CODE BELOW HERE ********/
int length = 17;
int width = 17;
int height = 2;
int volume;
// Volume of a box is length times width times height.
volume = length * width * height;
/******** MODIFY OR INSERT CODE ABOVE HERE ********/
return 0; // signals the operating system that our program ended OK.
}
Second, change the program above to calculate the
volume of any box-like structure or jail cell. (Oh, wait, I thought you
said prison, not prism.) In other words, ask the user to enter
a whole number for the length, width, and height of the prism (or
prison), and then capture that input via appropriate input statements.
Be considerate and think about what should always accompany an input
statement as well.
Next, we'll calculate the area of a circle.
Stating Facts to the Machine (declaring constants)You are aware of several facts about
the world, such as your GPA or your middle name. Some of these facts
change and some don't.
Imagine you're standing on top of a
building with a bucket of water balloons. When you drop a water balloon
from a building, you witness that water balloon accelerate toward the
ground according to the laws of gravity (a.k.a. free fall). Being a
totally genius Mines student, you know that acceleration of free fall
on Earth is approximately 9.8 m/s/s. This value is "constant" -- it
will never change (at least, as long as you're on Earth). Hence, we
call these sorts of things constants.
If we were to simulate dropping water
balloons as a computer program, it should be obvious that we would need
to somehow inform the machine that the acceleration of the balloons is
about 10 m/s/s. How do we define facts that do not change to the
machine? We "declare constants."
This is like telling the computer,
"Hey computer, there's something I'd like you to know about. It's
called FREE_FALL_ACCELERATION, which is an integer and is equal to ten.
Mmmkay? Don't forget it, and don't ever let it change while the program
is running. It's constant."
Alternatively, this is like saying
"The constant integer FREE_FALL_ACCELERATION is equal to ten."
You will realize very quickly that
despite the versatility of computers, they are incredibly picky. If you
tried any of the following:
FREE_FALL_ACCELERATION int const = 10;
cONSt int FREE_FALL_ACCELERATION = 10; int const FREE_FALL_ACCELERATION = 10; const int FREE_FALL_ACCELERATION = 10 const int = 10; Then you'd find that the computer
would whine. Programs must adhere to specific rules. We call these
rules "syntax." You follow the syntax of English every day. If your
friend called you up and asked, "Pizza hey order! let's" you would
think they were Yoda but, more importantly, you'd notice that your
friend isn't following English syntax.
When you declare constants, you must
follow proper syntax (in other words, the machine isn't smart enough to
translate your Yoda-code). For constants, the proper syntax is always
like this:
const int FREE_FALL_ACCELERATION = 10;
Recognize this syntax pattern, especially noticing the use of
const
.
One last thing. See how the constant
name is in CAPITAL letters? Always use ALL_CAPS for your constant
names. Why? Because then anyone reading your code will think "heh,
that's a constant!" (Plus, you'll lose points if you don't follow this
coding style.)
Calculate the Area of a CircleModify your program to compute the area of
a circle after printing the area of the prism. If you don't recall the area of a circle from elementary
school, then awww. (Good thing knowledge is always at your fingertips,
with that thing they call the Internet.)
Once you have a circle's area equation in hand, you'll realize you
should have three variables:
After the calculation, print the
circle's area. Use appropriate text in the output for understanding,
e.g., "The area of a circle with radius 5.2 is 84.9486". Here is an
example run of the complete program:
Enter the dimensions of your box: 4 2 5
The volume of your box is: 40 Enter the radius of your circle: 3.2 The area of a circle with radius 3.2 is 32.1699 Test ValuesHere are some known input/output
values that you can test against. Be sure to try your own to verify the
code works!
Lab Submission
You will submit your solution to this lab with the first homework
assignment. Detailed instructions for doing this are posted in Assignment 1.
This lab is due by Tuesday, August 29, 2017 11:59 PM . | |||||||||||||||||||||||||||||||
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Last Updated: 08/15/17 14:21
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