CS 159 – HW #02

CS 159 – HW #02

10 Points Possible
Problem: Given the mass of an airplane, the amount of forward force produced by its propellers, and the mass of the
TWO gliders it is towing (airplane connected to first glider and the first glider is connected to the second glider), calculate
the resulting tension on each cable connecting the aircraft and the acceleration of the glider. Vertical forces and air
resistance are not considered.
• Your program must accept input and produce output that matches exactly to the given executions. Note that the
width modifier used for the tension values is calculated as the number of digits in the force input plus six.
Example Execution #1 (eleven spaces after colon character for tension output):
Enter mass of airplane (kg) -> 15000
Enter mass of glider #1 (kg) -> 5000
Enter mass of glider #2 (kg) -> 4500
Enter force produced by propellers (N) -> 75000
Acceleration: 3.06 m/s^2
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Resulting tension on cable #1: 29081.63 Newtons
Resulting tension on cable #2: 13775.51 Newtons
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Example Execution #2:
Enter mass of airplane (kg) -> 15000
Enter mass of glider #1 (kg) -> 4500
Enter mass of glider #2 (kg) -> 5000
Enter force produced by propellers (N) -> 75000
Acceleration: 3.06 m/s^2
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Resulting tension on cable #1: 29081.63 Newtons
Resulting tension on cable #2: 15306.12 Newtons
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Example Execution #3:
Enter mass of airplane (kg) -> 12750.9
Enter mass of glider #1 (kg) -> 2125.2
Enter mass of glider #2 (kg) -> 2075.136
Enter force produced by propellers (N) -> 38657
Acceleration: 2.28 m/s^2
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Resulting tension on cable #1: 9578.79 Newtons
Resulting tension on cable #2: 4732.31 Newtons
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Example Execution #4:
Enter mass of airplane (kg) -> 7500
Enter mass of glider #1 (kg) -> 1260
Enter mass of glider #2 (kg) -> 1210
Enter force produced by propellers (N) -> 37500
Acceleration: 3.76 m/s^2
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Resulting tension on cable #1: 9290.37 Newtons
Resulting tension on cable #2: 4551.15 Newtons
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Example Execution #5 (ten spaces after colon character for tension output):
Enter mass of airplane (kg) -> 775
Enter mass of glider #1 (kg) -> 120
Enter mass of glider #2 (kg) -> 100
Enter force produced by propellers (N) -> 4500
Acceleration: 4.52 m/s^2
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Resulting tension on cable #1: 994.97 Newtons
Resulting tension on cable #2: 452.26 Newtons
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All course programming and documentation standards are in effect for this and each
assignment this semester. Please review this document!
Academic Integrity Reminder:
• Please review the policies of the course as they relate to academic integrity. The assignment you submit should be
your own original work. You are to be consulting only course staff regarding your specific algorithm for
assistance. Collaboration is not permitted on individual homework assignments.
Additional Requirements:
1. Add the homework assignment header file to the top of your program. A description of your program will need to
be included in the assignment header. This particular header can be added to your file by entering hhw while in
command mode in vi.
2. Each of the example executions provided for your reference represents a single execution of the program.
Your program must accept input and produce output exactly as demonstrated in the example executions, do not
add any “bonus” features not demonstrated in the example executions. Your program will be tested with the data
seen in the example executions and an unknown number of additional tests making use of meaningful data.
◦ All data input, output, or generated in the process of calculating the results displayed are assumed to be of the
double data type.
3. Course standards prohibit the use of programming concepts beyond the material found in the first three chapters
of the book, notes, and lectures to be acceptable for use.
◦ Continue to place ALL CODE inside of the main function.
4. A program MUST compile to be considered for partial credit. The submission script will reject the submission of
any file that does not successfully compile on the guru server. The name of the source code file you attempt to
submit must be hw02.c, no variation is permitted.
Course Programming and Documentation Standards Reminders:
• Indent all code found within the main function exactly two spaces.
• Place a single space between all operators and operands.
• Comment all variables to the right of each declaration. Declare only one variable per line.
• In general it is acceptable to initialize a variable declared in the local declaration section of a function. If the
expression used to initialize the variable is more complex than a constant assignment then it is
best to give the variable its first value inside of the executable statement section of the function.
• Notice that several programs (see program 2-9 on pages 74-75) in the programming text use a single line
comment to indicate the start of the local declaration and executable statement sections of the main function.
◦ At no point during the semester should these two sections ever overlap.
• Select meaningful identifiers (names) for all variables in your program.
• Do not single (or double) space the entire program, use blank lines when appropriate.
• There is no need to include example output with your submission.
Auto-Grade Tool
• We have implemented what is being referred to as the auto-grade tool. At the time of a successful assignment
submission you may receive some feedback on your program in regards to course programming and
documentation standards. This feedback may include a potential deduction that you will receive once your
assignment is reviewed by your grader.
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reasonable to the submission. Graders may make additional deductions for those standards not identified by the
new tool.
• We hope that this feedback helps with the enforcement of course standards, consistency in grading across
sections, and to encourage students to revise their work when problems are identified before the assignment
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