Loops Exercises

1. Write a python script that requests a starting number and a stopping number from the user. Display each number from the starting number to the stopping number on its own line. For example:

   Please enter a number: 5
   Please enter another number: 9
   5
   6
   7
   8
   9
   

   Another example:

   Please enter a number: 9
   Please enter another number: 5
   5
   6
   7
   8
   9
   

2. Write a python script that requests a starting number and a stopping number from the user. Display the sum of all numbers from the starting number to the stopping number (inclusively). For example:

   Please enter a number: 5
   Please enter another number: 9
   The sum of the numbers between 5 and 9 is 35
   

   Another example:

   Please enter a number: 9
   Please enter another number: 5
   The sum of the numbers between 5 and 9 is 35
   

3. Name Game Demo:

   Please type your name:
   

   1. Draw a flowchart of the algorithm that the game used
   2. Write python code for the name game
4. Write python code to request either "yes" or "no" from the user. Continue to prompt the user until either "yes" or "no" is entered. Then display their response. Examples:

   Please enter yes or no: maybe
   Please enter yes or no: Yes
   Please enter yes or no: yes
   Thank you for entering yes

   Please enter yes or no: why
   Please enter yes or no: why
   Please enter yes or no: why
   Please enter yes or no: no
   Thank you for entering no

   Please enter yes or no: yes
   Thank you for entering yes

5. Write python code using a while statement to produce the exact same results as the code below:

   # set the initial number
   startNum = 10
   
   # count down until we get to 1
   for num in range(startNum, 0, -1):
       print( num, "...")
   print( num, "!", sep='')
   

6. What is the output of the following script:

   print( "Before the for loop ..." )
   for i in range( 100, 0 ):
       print( i )
   print( "All done" )
   

7. What is the output of the following script:

   pigsFly = True
   print( "Before the while loop ..." )
   while pigsFly == False:
       print("I'm not going to change")
   print("Ok, I'll change")

8. What is the output of the following script:

   pigsFly = False
   print( "Before the while loop ..." )
   while pigsFly == False:
       print("I'm not going to change")
   print("Ok, I'll change")
   

9. Below is a python script that will display a table (a TAB-delimited output) of sin() values (for every 30 degrees):

   import math
   
   print("Radians" + "\t" + "sin()")
   for degrees in range(0, 361, 30):
       rads = math.radians(degrees)
       sinValue = math.sin(rads)
       print( round(rads,3), round(sinValue,3), sep='\t')
   

   Modify the script to display a table that includes degrees in the first column. For example:

   Degrees	Radians	sin()
   0	0.000	0.000
   30	0.524	0.500
   60	1.047	0.866
   90	1.571	1.000
   120	2.094	0.866
   150	2.618	0.500
   180	3.142	0.000
   210	3.665	-0.500
   240	4.189	-0.866
   270	4.712	-1.000
   300	5.236	-0.866
   330	5.760	-0.500
   360	6.283	-0.000

   Now, add a column for cos().
10. What does the following code display?

    MAX_NUM = 15
    for i in range(1, MAX_NUM + 1):
        for j in range(1, MAX_NUM + 1):
            print(i*j, end='\t')
        print()
    

11. What does the following code display?

    BASE = 10
    
    for j in range( BASE ):
        for k in range( BASE ):
            print(j, k, sep="")