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# CptS 121 Programming Assignment 1: Equation Evaluator solved

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## Description

I. Learner Objectives:
At the conclusion of this programming assignment, participants should be able to:
Analyze a basic set of requirements for a problem and derive logical solutions to them
Declare variables
Apply C data types and associated mathematical operators
Comment a program according to class standards
Logically order sequential C statements to solve small problems
Compose a small C language program
Compile a C program using Microsoft Visual Studio 2019 or 2022
Execute a program
Create basic test cases for a program
II. Prerequisites:
Before starting this programming assignment, participants should be able to:
Access Microsoft Visual Studio 2019 or 2022 Integrated Development Environment (IDE)
Summarize topics from Hanly & Koffman Chapters 1 – 2 including:
The steps of the software development method
C language elements (preprocessor directives, reserved words, and standard identifiers)
The standard C data types
The general form of a high-level program
III. Overview & Requirements:
Write a C program that evaluates the equations provided below. All equations should be placed in a single project! The program must prompt the user
for inputs to the equations and evaluate them based on the inputs. All variables on the right hand sides of the equations must be inputted by the user.
All variables, except for the plaintext_character, encoded_character, offset, and variable a are floating-point values. The plaintext_character and
encoded_character variables are characters, and the offset and a variable are integers. PI, G must be defined as a constant macros (#defined
constants). Error checking is NOT required for your program. You do NOT need to check for faulty user input or dividing by zero.
1. Newton’s Second Law of Motion: force = mass * acceleration
2. Volume of a cylinder: volume_cylinder = PI * radius2 * height
3. Character encoding: encoded_character = offset + (plaintext_character – ‘a’) + ‘A’ (note: what happens if plaintext_character is lowercase?)
4. Gravity: force = G * mass1 * mass2 / distance2, where G is the gravitational constant with value 6.67 * 10-11
5. Resistive divider: vout = r2 / (r1 + r2) * vin
6. Distance between two points: distance = square root of ((x1 – x2)2 + (y1 – y2)2) (note: you will need to use sqrt ( ) out of )
7. General equation: y = (89 / 27) – z * x + a / (a % 2) (recall: a is an integer; the 89 and 27 constants in the equation should be left as integers
initially, but explicitly type-casted as floating-point values)
IV. Expected Results:
The following console window illustrates inputs and outputs that are appropriate for your program. Your program must display the results in a similar
form as shown in the window. The window shows possible results, for the given input tests, for the first two equations only.
Note: you will need to display the results for all of the equations!
V. Submitting Assignments:
1. Using Canvas https://canvas.wsu.edu/, please submit your solution to the correct “Programming Assignments” (PA) folder. Your solution should be
Canvas lab course space. Select the “Assignments” link in the main left menu bar. Navigate to the correct PA submission folder. Click the “Start
Assignment” button. Click the “Upload File” button. Choose the appropriate .zip file with your solution. Finally, click the “Submit Assignment”
button.
2. Your project should contain your C source file (which must be a .c file).
3. Your project must build properly. The most points an assignment can receive if it does not build properly is 65 out of 100.
This assignment is worth 100 points. Your assignment will be evaluated based on a successful compilation and adherence to the program requirements.
We will grade according to the following criteria:
5 pts for correct declaration of constant macros
35 pts for proper prompts and handling of input (5 pts/equation)
49 pts for correct calculation of results based on given inputs (7 pts/equation)
11 pts for adherence to proper programming style established for the class and comments