Contents
- eval_cond.py
- grade_elif.py
- grade.py
- speedingticket.py
eval_cond.py 1/4
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# Examples of advanced conditionals
# by Sara Sprenkle
x = 2
y = 3
z = 4
b = x==2
c = not b
# Note: because of precedence, we don't _need_ parentheses
# I added parentheses for readability/emphasis
d = (y<4) and (z<3)
print("d =", d)
d = (y<4) or (z<3)
print("d =", d)
d = not d
print(b, c, d)
grade_elif.py 2/4
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# Compute the letter grade, based on the numeric grade.
# Added checking for erroneous input.
# CSCI 111
# set up the constants for the bounds on the numeric score
MIN_GRADE=0
MAX_GRADE=100
# get the input from the user for the numeric grade
grade = eval(input("Enter the numeric score: "))
# make sure that the user entered a number in the valid range
if grade >= MIN_GRADE and grade <= MAX_GRADE:
# The following code computes the letter grade from the numeric grade.
if grade >= 90:
letter_grade = "A"
elif grade >= 80:
letter_grade = "B"
elif grade >= 70:
letter_grade = "C"
elif grade >= 60:
letter_grade = "D"
else:
letter_grade = "F"
print("The letter grade is", letter_grade)
# Compare using elif to using nested if-else-if statements
else:
print( "The grade must be between", MIN_GRADE, "and", MAX_GRADE )
grade.py 3/4
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# Compute the letter grade, based on the numeric grade
# CSCI 111
# get the input from the user for the numeric grade
grade = eval(input("Enter the numeric score: "))
# The following code computes the letter grade from the numeric grade.
# Assign a letter grade and then fill into the print statement.
# This approach reduces the duplication of print statements.
# If we need to change a print statement, we'd have a lot to change.
if grade >= 90:
letter_grade = "A"
else:
if grade >= 80:
letter_grade = "B"
else:
# What do we know about the grade at this point?
if grade >= 70:
letter_grade = "C"
else:
### Here we know that grade < 70
if grade >= 60:
letter_grade = "D"
else:
letter_grade = "F"
print("The letter grade is", letter_grade)
speedingticket.py 4/4
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# Any speed clocked over the limit results in a fine of at least $50, plus $5
# for each mph over the limit, plus a penalty of $200 for any speed over 90mph.
# Our program
# Input: speed limit and the clocked speed
# Output: either (a) that the clocked speed was under the limit or
# (b) the appropriate fine
# CSCI 111, 9/28/2012
EXCESSIVE_SPEED = 90
print("This program determines whether you were speeding and your fine,")
print("if appropriate.")
# getting the necessary input from the user
speed = eval(input("Enter your speed: "))
speedlimit = eval(input("Enter the speed limit: "))
if speed > speedlimit:
# you're speeding
# calculate the fine
over = speed - speedlimit
fine = 50 + over*5
# reckless driving
if speed > EXCESSIVE_SPEED:
fine = fine + 200
print("You're driving too fast!")
print("Your fine is $", fine)
else:
# not speeding!
print("Continue safe driving practices")
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