Section 2.9 Unit 2 Selection Mixed-Up Coding Practice Exercises

90 minutes

Try to solve each of the following. Click the Check button to check each solution. You will be told if your solution is too short, has a block in the wrong order, or you are using the wrong block.

These are exercises written by Dr. Barb Ericson from the AP CSP, Welcome to CS, and Python for Everybody ebooks on Runestone.

Activity 2.9.1.

The following program segment should ask the user for three numbers and say whether they are in order. The numbers can be either ascending (going up) or descending (going down).

For example, if the inputs are 10 15 20, the answer should be “yes, in order”. Same if the inputs were 6 5 1. But if the inputs were 3 5 4, the answer would be “no, not in order”.

The blocks have been mixed up and include extra blocks that aren’t needed in the solution. Drag the needed blocks from the left and put them in the correct order on the right.

first = int( input("Enter the first number: ") )
second = int( input("Enter the second number: ") )
third = int( input("Enter the third number: ") )
---
if (second > first and second < third)  
                  or (third < second and second < first):
---
if (second > first or second < third) 
               and (third < second or second < first):  #distractor
---
 print("yes, in order")
---
else:
---
 print("no, not in order")

Activity 2.9.2.

Create code that sets price to 1.5 if weight is less than 2, otherwise set price to 1.3, then set total to the weight times price. For example, if weight is 0.5 then price should be set to 1.5 and total will be 0.75.

weight = 0.5
numItems = 5
if weight < 2:
---
    price = 1.50
---
if weight >= 2:
---
    price = 1.30
---
total = weight * price

Activity 2.9.3.

Create code that sets the variable number to x is a number from 1 to 10 if the value of x is 1-10, x is a number less than 1 if the value of x is zero or below, and x is a number greater than 10 if the value of x is more than 10.

x = 3
---
if x >= 1 and x <= 10:
---
    number = "x is a number from 1 to 10"
---
elif x < 1:
---
    number = "x is a number less than 1"
---
    number = "x is greater than 1"  #paired
---
else:
---
    number = "x is a number greater than 10"
---
else x < 1:  #paired

Activity 2.9.4.

Create code that sets the variable rate to the cost of a 14 mile cab ride. If the distance traveled is less than or equal to 12 miles, then rate cost is $2.00 a mile, and if the distance traveled is more than 12 miles then rate cost is $1.50 a mile. Assign the final cost to the variable total.

distance = 14
---
if distance <= 12:
---
if distance is 12:  #paired
---
    rate = 2.00
---
if distance > 12:
---
if distance < 12:  #paired
---
    rate = 1.50
---
total = distance * rate
---
total = distance / rate  #paired
---
print("Total cost of trip: " + str(total))

Activity 2.9.5.

Create code so that after x and y are defined, they are compared and if the value of x is less than y it sets the variable result to "x is less than y"; if x is greater than y then result is set to "x is greater than y"; and result is "x and y must be equal" if the values are equal.

x = 10
---
y = 10
---
if x < y:
---
    result = "x is less than y"
---
else:
---
    if x > y:
---
        result = "x is greater than y"
---
    else:
---
        result = "x and y must be equal"

Activity 2.9.6.

Write code so that after x and y are defined, they are compared and if the value of x and y are the same object the variable value will be set to "x and y are the same"; if x and y have the same value then value is "x and y have the same value"; and value is "x and y are not similar" if x and y do not fit the other conditionals.

x = 12
---
y = x
---
if x is y:
---
    value = "x and y are the same"
---
elif x == y:
---
    value = "x and y have the same value"
---
else:
---
    value = "x and y have different values"

Activity 2.9.7.

Create code that will set the variable grade to the grade equivalent (string) for a score. It should set grade to E for any value below 60, D for 61 to 69, C for 70 to 79, B for 80 to 89 and A for 90 and above. For example, if the score is above 90, grade should be A.

score = 93
---
if score >= 90:
---
    grade = "A"
---
elif score >= 80:
---
    grade = "B"
---
elif score >= 70:
---
    grade = "C"
---
elif score >= 60:
---
    grade = "D"
---
else:
---
    grade = "E"
---
print(grade)
---
    elif grade >= 90:  #distractor
---
    score = "c"  #distractor

Activity 2.9.8.

Create code that should set the variable result to determine whether a number is odd or even.

x = 3
---
if x % 2 == 0:
---
if x / 2 == 0:  #paired
---
    result = "x is even!"
---
else:
---
    result = "x is odd"
---
elif x % 2 == 1:  #paired

Activity 2.9.9.

Create code that should set the variable result equal to “Good job” when the number is between 1 and 10 (inclusive) or is 15 and result should be set to “Fail” when it is not.

x = 8
---
if x >= 1 and x <= 10 or x == 15:
---
    result = "Good job"
---
else:
---
    result = "Fail"
---
elif x == 15:  #paired

You have attempted of activities on this page.

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