Absolute C++, Student Value Edition, 6/e
6th Edition
ISBN: 9780133970982
Author: SAVITCH
Publisher: Pearson Education
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Textbook Question
Chapter 3, Problem 15PP
The Social Security Administration maintains an actuarial life table that contains the probability that a person in the United States will die (http://www.ssa.gov/OACT/STATS/table4c6.html). The death probabilities for 2009 are stored in the file LifeDeathProbabi1ity. txt, which is included on the website for the book. There are three values for each row: the age, the death probability for a male, and the death probability for a female. For example, the first five lines are
0 0.006990 0.005728
1 0.000447 0.000373
2 0.000301 0.000241
3 0.000233 0.000186
4 0.000177 0.000150
The interpretation for the fourth line is that a 3-year-old female has a 0.000186 chance of dying during year 3 to 4.
Write a
If the simulation reaches age 120, then stop and predict that the user will live to 120. The main function should output the simulated age at which the person will die. This program is merely a simulation and will give different results each time it is run, assuming you change the seed for the random number generator.
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Write a program in Python that reads student information from a text file, then creates a text file that records the course grades of the students and a final grade. Each row of the .txt file contains the Last Name, First Name, Midterm1 score, Midterm2 score, and the Final score of a student, each separated by a space. A sample of the student information is provided in StudentInfo.txt below. Assume the number of students is at least 1 and at most 20. The program performs the following tasks: • Read the file name of the .txt file from the user. • Open the .txt file and read the student information using readline() or readlines(). • Compute the average exam score of each student. • Assign a letter grade to each student based on the average exam score in the following scale: ◦ A: 90 =< x ◦ B: 80 =< x < 90 ◦ C: 70 =< x < 80 ◦ D: 60 =< x < 70 ◦ F: x < 60 • Output the first names, last names, exam scores, and letter grades of the students into a text file named…
The following sample file called grades.txt contains grades for several students in an imaginary class. Each line of this file stores a student's name followed by their exam scores. The number of scores might be different for each student.
abdul 10 15 20 30 40erica 23 16 19 22haroon 8 22 17 14 32 17 24 21 2 9 11 17omar 12 28 21 45 26 10chengjie 14 32 25 16 89alex 15 22 11 35 36 7 9bryan 34 56 11 29 6laxman 24 23 9 45 27
Now, consider the following code.
f = open("grades.txt", "r")
for aline in f:
items = aline.split()
# choose your option for this part
f.close()
Which option prints out only the names of each student in stored in grades.txt?
Question 11 options:
print(items[0:])
print(items[0])
print(items[0][0])
The following sample file called grades.txt contains grades for several students in an imaginary class. Each line of this file stores a student's name followed by their exam scores. The number of scores might be different for each student.
abdul 10 15 20 30 40erica 23 16 19 22haroon 8 22 17 14 32 17 24 21 2 9 11 17omar 12 28 21 45 26 10chengjie 14 32 25 16 89alex 15 22 11 35 36 7 9bryan 34 56 11 29 6laxman 24 23 9 45 27
Now, consider the following code.
f = open("grades.txt", "r")
for aline in f:
items = aline.split()
# choose your option for this part
f.close()
1. Which option prints out the names of students that have more than six scores stored in grades.txt?
a.
if len(items[1:]) == 6:
print(items[0])
b.
if len(items[:]) > 6:
print(items[0])
c.
if len(items[1:]) > 6:
print(items[0])
2. Which option prints out only the names of each student in stored in grades.txt?
a.…
Chapter 3 Solutions
Absolute C++, Student Value Edition, 6/e
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