Algorithms Homework 2 A module that reads in a name and GPA and returns these pieces of information to the main algorithm

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Homework 2 Criteria

Note: To receive any credit whatsoever, your answers must be legible and readily readable in the

judgment of the grader. Add brief explanatory comments as necessary to make sure your

answers are clear and unambiguous to the grader.

[p1] 25 points

Write the headers for the following modules. You DO NOT have to write the code for the modules.

a) A module that reads in a name and GPA and returns these pieces of information to the main

algorithm.

b) A module that detemines the two roots of a quadratic equation, given the equation coefficients A,

B, and C. (You can assume that the coefficients A, B, and C will only produce real roots.)

c) Given a person’s birthday (month, day, and year), returns a string representing the day of the week

on which the person was born.

d) A module that, passed in a number, prompts the user for a second number and adds the two

numbers together, returning the result to the main algorithm.

e) A module that will return the distance between two coordinates on a two-dimensional Cartesian

plane. (Each coordinate has an x and a y component).

[c1] 25 points

Sample Answers:

GRADING CRITERIA:

a) -1 for not making it a procedure (pro)

-2 for not having the name parameter (npo)

b) -1 for not making it a procedure (pro)

-2 for not having the A, B, and C parameters (npo)

Homework 2 Criteria, Page 2 of 9

c) -2 for not making it a function (fun)

d) -1 for not making it a procedure (pro)

-1 for not making it a num (num)

e) -2 for not making it a function (fun)

Additional Deductions:

[p2] 10 points

Explain the difference between a procedure and a function. Give an example of when each would be used.

[c2] 10 points

Sample Answer:

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GRADING CRITERIA:

[p3] 10 points

Give and explain 3 reasons why using good modularity a good thing.

[c3] 10 points

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Homework 2 Criteria, Page 4 of 9

[p4] 5 points

Declare the appropriate constants for solving this problem.

[c4] 5 points

[p5] 12 points

Write a module that will read a grade for a single class from the user. The module should take in as a

parameter a description of the class whose grade is being entered, display “Enter the grade for <class

description>”, read in the grade from the user, and pass the grade back to the calling module.

[c5] 12 points

Sample Solution:

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Homework 2 Criteria, Page 5 of 9

GRADING CRITERIA:

Header

[p6] 10 points

Write a module that will return the number of points a given letter grade is worth. The module should take

the letter grade in as a parameter and return the corresponding point value. You may assume that only

valid letter grades (i.e. A, B, C, D, and F) will be passed to the module.

[c6] 10 points

Sample Solution:

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Homework 2 Criteria, Page 6 of 9

GRADING CRITERIA:

Header

Body

Additional Deductions:

[p7] 10 points

Write a module that will compute the student’s GPA using the formula described above. The module will

take in as parameters the student’s letter grades for each of the five required classes, and calculate the grade

point average (a number).

[c7] 10 points

Sample Solution:

function GPA returnsa Num ( civil_procedure_grade,

legal_writing_grade,

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Homework 2 Criteria, Page 7 of 9

GRADING CRITERIA:

Header

-1 for not having it return a num (num)

Body

-6 for wrong computation (log)

-1 for not weighing the scores by the number of hours (log)

Additional Deductions:

-1 for each poor variable or procedure name (prn)

[p8] 10 points

Write a module that takes in as a parameter a student’s GPA and calculates a result of true if they have lost

their scholarship, or false otherwise.

[c8] 10 points

Sample Solution:

function Has_Lost_Scholarship returnsa Boolean (gpa isoftype in Num)

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GRADING CRITERIA:

Body

-2 for not having the proper test (log)

Additional Deductions:

-1 for each poor variable or procedure name (prn)

[p9] 30 points

Write an algorithm that will allow a student to actually use all of the modules you have created. The

algorithm should perform the following steps:

1. Read in grades for all of the five classes.

2. Compute and print the student’s GPA.

3. Print whether or not the student has lost their scholarship.

[c9] 30 points

Sample Solution:

algorithm Compute_Grades

civil_procedure_grade,

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Homework 2 Criteria, Page 9 of 9

GRADING CRITERIA:

-1 points for not having “algorithm xxxx” (alg)