Category Archives: 99 Python Problems

– Loop Solutions

2 Loop Solutions

 1: def oneToTen():
 2:         for i in range(1,11):
 3:                 print(i)
 4: 
 5: def oneToTenAcross():
 6:       print("|", end="")
 7:         for i in range(1,11):
 8:                 print(i,"|",end="")
 9: 
10: def oddNumbers():
11:         for i in range(1,21,2):
12:                 print(i)
13: 
14: def squares():
15:         for i in range(1,11):
16:                 print(i*i)
17: 
18: def random4():
19:         for i in range(1,5):
20:                 print(random.randint(1,10))
21: 
22: def even(n):
23:         for i in range(1,n+1):
24: 
25: 
26: def powers(n):
27:         for i in range(1,n+1):
28:                 print(2**i)
29: 
30: def triangle():
31:         for i in range(1,6):
32:                 for j in range(1,i+1):
33:                         print("*", end = "")
34:                 print()         
35: 
36: def areWeThereYet():
37:         s = "no"
38:         while (s != "yes"):
39:                 s = input("Are we there yet?")
40:         print ("Good!")
41: 
42: 
43: def tableSquare():
44:         for i in range(1,5):
45:                 for j in range (1, 5):
46:                         print("|",i*j, "\t", end = "")
47:                 print("|")
48: 
49: def tableSquares(n):
50:         for i in range(1,n+1):
51:                 for j in range (1, n+1):
52:                         print("|",i*j, "\t", end = "")
53:                 print("|")

2: Loops

2.1 One to 10

Write a function that prints the numbers 1 to 10

2.1.1 Example

 1: oneToTen()
 2:  *** Output ***
 3: 1
 4: 2
 5: 3
 6: 4
 7: 5
 8: 6
 9: 7
10: 8
11: 9
12: 10

2.2 One to 10 across

In Python 3, you can use the end=”” parameter in print to prevent a newline at the end of a print(). For example, print(“frog”,end=””) will print frog without moving to the next line. Use that to write a function that prints the numbers 1 to 10 across the screen as shown

2.2.1 Example

1: oneToTenAcross()
2:  *** Output ***
3: |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |

2.3 Odd Numbers

Write a function that prints the positive odd numbers less than 20

2.3.1 Example

 1: oddNumbers()
 2:  *** Output ***
 3: 1
 4: 3
 5: 5
 6: 7
 7: 9
 8: 11
 9: 13
10: 15
11: 17
12: 19

2.4 Square Numbers

Write a function that prints the square numbers up to 100

2.4.1 Example

 1: squares()
 2:  *** Output ***
 3: 1
 4: 4
 5: 9
 6: 16
 7: 25
 8: 36
 9: 49
10: 64
11: 81
12: 100

2.5 Random Numbers

Write a for loop to print out four random integers between 1 and 10

2.5.1 Example

1: random4()
2:  *** Output ***
3: 3
4: 5
5: 2
6: 8

2.6 Even Numbers < n

Write a function to print out the positive even numbers less than n

2.6.1 Example

 1: even(20)
 2:  *** Output ***
 3: 2
 4: 4
 5: 6
 6: 8
 7: 10
 8: 12
 9: 14
10: 16
11: 18

2.7 Powers of 2

Write a function to print out the powers of 2 from 21 up to 2n

2.7.1 Example

 1: powers(8)
 2:  *** Output ***
 3: 2
 4: 4
 5: 8
 6: 16
 7: 32
 8: 64
 9: 128
10: 256

2.8 Are we there yet?

Write a program that outputs “Are we there yet?” and then waits for input. If the input is “Yes” the program outputs “Good!” and exits, otherwise the program loops.

2.8.1 Example

1: "Are we there yet?"
2: No
3: "Are we there yet?"
4: Spoons
5: "Are we there yet?"
6: Yes
7: Good!

2.9 Triangle

Write a function that uses nested loops to produce the following pattern.

1: triangle()
2:  *** Output ***
3: *
4: **
5: ***
6: ****
7: *****

2.10 Table Square

Write a function that prints out a 4 x 4 table square

2.10.1 Example

1: tableSquare()
2:  *** Output ***
3: A 4 x 4 table square
4: | 1 | 2 |  3 |  4 |
5: | 1 | 2 |  3 |  4 |
6: | 2 | 4 |  6 |  8 |
7: | 3 | 6 |  9 | 12 |
8: | 4 | 8 | 12 | 16 |

2.11 Table Squares

Extend your answer to the last question produce a function that will print out a n x n table square

2.11.1 Example

1: tableSquares(6)
2:  *** Output ***
3: A 6 x 6 table square
4: | 1 |  2 |  3 |  4 |  5 |  6 |
5: | 2 |  4 |  6 |  8 | 10 | 12 |
6: | 3 |  6 |  9 | 12 | 15 | 18 |
7: | 4 |  8 | 12 | 16 | 20 | 24 |
8: | 5 | 10 | 15 | 20 | 25 | 30 |
9: | 6 | 12 | 18 | 24 | 30 | 36 |

1: How to Answer these Questions

Write functions to solve all of the questions. Here are two example questions and their solutions. Notice that the first function prints a value, the second function returns a value.

1 Hello <Name>

Write a function that accepts a name as a parameter and prints out “Hello ” <name>

1.1 Example

hello("Kim")
 *** Output ***
Hello Kim

2 Average of two numbers

Write a function that accepts two numbers and returns the average of the two numbers.

2.1 Example

print(average(3,4));
 *** Output ***
3.5

3 Solutions

1: def hello(s):
2:     print("Hello ",s)
3: 
4: def average(i,j):
5:     return (i+j)/2
6: 
7: hello("Kim")
8: print(average(3,5))