Lab_06-AnswerSheet (1)

CS 171 - Lab 6 Professor Mark W. Boady and Professor Adelaida Medlock Content by Professor Lisa Olivieri of Chestnut Hill College Detailed instructions to the lab assignment are found in the following pages. ● Complete all the exercises and type your answers in the space provided. What to submit: ● Lab sheet in PDF. Submission must be done via Gradescope ● Please make sure you have marked the questions on the correct pages of the PDF and added any teammates to the submission ● We only accept submissions via Gradescope. Student Name: Shaun Mangan User ID (abc123): sam677 Possible Points: 88 Your score out of 88 : Lab Grade on 100% scale: Graded By (TA Signature):

CS 171 Lab 6 Week 6 Question 1: 1 point FYI: Predefined/built-in functions : segments of code already included in Python. print() , round() , abs() , pow() , int() are examples. Arguments : The information that a function needs to work. Arguments are sent to the function between the parentheses () . To use a function, call the function. input( " Enter your name " ) is a call to the input function sending the string " Enter your name " as an argument. Closely examine the Python program below. #Get Input name = input ("Enter your name: ") #Print Results print ("Name:", name) (a) (1 point) Circle / highlight calls to predefined functions in the program above. Question 2: 8 points Enter and execute the following Python program. (a) (1 point) What is printed by Line 2? 4.67 (b) (1point) What is printed by Line 3? 125 (c) (1 point) What is printed by Line 4? 7.0 (d) (1 point) What is printed by Line 5? 34 (e) (1 point) What is printed by Line 6? 7 (f) (1 point) What is printed by Line 9? 98 (g) (2 points) What is the difference between the round () function and the int () function? 2 1 #Sample functions 2 print ( abs (−4.67) ) 3 print ( pow (5, 3) ) 4 print ( pow (49, 0.5) ) 5 print ( int (34.8) ) 6 print ( round (6.9) ) 7 8 import random 9 print (random.randint(1 ,100) )

CS 171 Lab 6 Week 6 x = 4.7 y = 5.3 z = −4.8 a = −3.2 print (math.ceil(x)) print (math.ceil(y)) print (math.ceil(z)) print (math.ceil(a)) print (math.floor(x)) print (math.floor(y)) print (math.floor(z)) print (math.floor(a)) (a) (2 points) Explain the purpose of the ceil() function This rounds the number up to the nearest integer. (b) (2 points) Explain the purpose of the floor() function. This rounds the number down to the nearest integer. (c) (2 points) Why are the calls to the floor() and ceil() functions preceded by “ math .”? Because they need the math function to be imported in order for the functions to run. FYI: A function is a segment of code that performs a single task. A function definition is the segment of code that tells the program what to do when the function is executed. The first line of a function definition is known as the function header Question 8: 6 points Review the following Code. #Description: This program uses a function to print a message #Function Definition def printMessage (): print ("Welcome to Python.") print ("Learn the power of functions!") #Function Definition def main() : print ("Hello Programmer!") #Function Call printMessage () #Function Call main() (a) (1 point) What Python keyword is used to indicate that a code segment is a function definition? def 4

CS 171 Lab 6 Week 6 (b) (1 point) What are the two function headers in the Python code? def printMessage():, and def main(): (c) (1 point) The name of the function is in the function header. What are the names of the two functions? printMessage and main (d) (1 point) Enter and execute the Python program. What is the output? Hello Programmer! Welcome to Python. Learn the power of functions! (e) (2 points) What line of code would you add to the program to print the last two lines twice? Where would you add the code? I would add printMessage() under calling the main function. Question 9: 14 points Examine the following code. #Description: This programuses functions to calculate # the area of a circle, given the radius import math def calculateArea (radius): - function def area = math.pi ∗ radius ∗∗ 2 print ("A circle of Radius %d has area %.2f" %(radius, area)) def main() : radius = int ( input ("Enter the radius: ")) calculateArea(radius) - function call #### Call to main #### main() (a) (2 points) Label the function definitions and the function calls in the above code. (b) (2 points) The function call and the function definition for calculateArea each include a variable within the parentheses. The variable in the function call is known as an argument . The variable in the function definition is called a parameter . What is the parameter in the function definition? What is its purpose? The parameter is the radius, its purpose is to take the radius that the person entered in, and calculate the area with it. 5

CS 171 Lab 6 Week 6 def drawFrog(): print(" @..@") print("(----)") print("(>--<)") print("^^--^^") drawFrog() print() Question 11: 5 points Add a for loop to call the function multiple times and print the following. Put your Python code for this answer. Frog 1 Frog 2 Frog 3 Frog 4 7

CS 171 Lab 6 Week 6 def drawFrog(): print(" @..@") print("(----)") print("(>--<)") print("^^--^^") for i in range(4): drawFrog() print() FYI: So far, the functions you have created print the results within the function. They do not send back any information to the original calling code. Functions that do not send back information are known as void functions . Functions often send back or return a result and are known as value returning functions . Question 12: 10 points Review the following code. # This program prompts the user for two numbers, # calls a function to determine the smaller number # and prints the smaller number that is returned from the function def getSmaller (num1, num2): if num1 < num2: smaller = num1 else : smaller = num2 return smaller def main() : userInput1 = int ( input ("Enter a number: ") ) userInput2 = int ( input ("Enter a second number: ") ) smallerNumber = getSmaller ( userInput1, userInput2 ) print ("The smaller of the two numbers is", smallerNumber) ##Call Main main() (a) (2 points) What is the new keyword used in the function definition? return (b) (2 points) What do you think the keyword tells the program to do? returns the smaller variable, pretty much telling the function what to print out. 8

CS 171 Lab 6 Week 6 Question 14: 6 points Develop and test the following code in Python. Carefully examine and then complete the following Python program. • The program prompts the user to enter a number between 1 and 5 • It also generates a random number between 1 and 5. • The program prints the number the user enters and prints the random number. • The program then compares the two numbers. – If the numbers are the same, it prints the message “You picked the same number as the computer!”. – If the number the user entered is higher than the random number, the program should print “Your number is higher than the computer’s number.” – Otherwise, it should print: “Your number is smaller than the computer’s number”. Complete the code for the getMessage() function so that it returns the appropriate message, depending on the values stored in the two parameters. See Sample Output for the correct messages to be returned. import random def getMessage (userNum, randNum): #Rewrite this function return "" def main() : userNum = int ( input ("Enter a number between 1 and 5: ") ) while userNum > 5 or userNum < 1: userNum = int ( input ("Invalid number. Enter a number between 1 and 5: ") ) randNum = random.randint (1, 5) print ("Computer number:", randNum) print ("User number:", userNum) print ( getMessage (userNum, randNum) ) ##Call Main main() Rewrite the getMessage function so that it prints the below responses. • You picked the same number as the computer! • Your number is smaller than the computer’s number. • Your number is higher than the computer’s number. Write your new function definition below. def getMessage (userNum, randNum): #Rewrite this function if(userNum==randNum): return("You picked the same number as the computer!") if(userNum>randNum): return("Your number is higher than the computer's number.") if(userNum<randNum): 10

CS 171 Lab 6 Week 6 return("Your number is lower than the computer's number.") Question 15: 10 points Complete the following program. The program should: • Display five addition facts, one at a time, and allow the user to answer them. • Provide the correct answer if user enters incorrect answer. • Print a congratulatory answer, if the answer is correct. • Keep track of the number of problems the user answers correctly. • Prints a special message, if the user gets all five problems correct. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 # Include the required import statement # Fill-in 1 def printRocket (): # Include a FOR loop that prints the numbers from 10 to 0 # Fill-in 2 # Fill-in 3 print ("Blast-off!!") print (" *") print ("***") print ("*****") print ("*****") print ("*****") print ("*****") def main (): numCorrect = 0 for x in range (5): # Assign a random number between 1 and 10 # to num1 and num2 num1 = #Fill-in 4 num2 = #Fill-in 5 answer = int ( input ( str (num1) + "+" + str (num2)+ "=" ) ) # Write the test condition to determine if the user’s # answer is equal to the sum of the two numbers if # Fill-in 6 print ("Congratulations! Your answer is correct!\n") # Write the line of code to increment the variable # that keeps track of the number of correct answers # Fill-in 7 else : print ("Sorry, your answer is incorrect.", end = " ") 11

CS 171 Lab 6 Week 6 numCorrect ==25: (j) (1 point) What should go on Line 43 printRocket() 13