Introduction to Python

Form 4 - Computer

2023-2024

Floor 4 - Computer Room

Mr. Peter

Outline

Outline

While Loop

1

Number Sequences

2

Exercises

3

While Loop Statement

1.

2.

Tab

while Condition :

Command1

While Loop Statement

i = 1
while i <= 10:
    print(i)
    i = i + 1

While Loop from 1 to 10

While loop statement - Ex10_1

Right Triangle

Write a program that asks the user to enter a positive integer n, and then prints a right triangle consisting of n rows of asterisks.

Example

n = int( input( "Please input a positive integer: " ) )

Save the file as "XX_YYYY_Ex10_1.py"

While loop statement - Ex10_2

Inverse Right Tangle

Write a program that asks the user to enter a positive integer n, and then prints a right triangle consisting of n rows of asterisks.

Example

n = int( input( "Please input a positive integer: " ) )

Save the file as "XX_YYYY_Ex10_2.py"

While loop statement - Ex10_3

Multiples of 10:

Write a Python program to print the multiplication table for the number 10 up to 10

Example:

10 x 1 = 10

10 x 2 = 20

10 x 3 = 30

10 x 4 = 40

10 x 5 = 50

10 x 6 = 60

10 x 7 = 70

10 x 8 = 80

10 x 9 = 90

10 x 10 = 100

Save the file as "XX_YYYY_Ex10_3.py"

Write a Python program that prints a reversed triangle consisting of 10 rows of asterisks. The first row should contain one asterisk, the second row should contain two asterisks, and so on, up to 10 asterisks in the last row, which should be left-justified.

While loop statement - Ex10_4

Example

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

Reversed Triangle

Save the file as "XX_YYYY_Ex10_4.py"

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

Reversed Triangle

While loop statement - Ex10_4

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

Reversed Triangle

Space

Asterisks

9

_______

1

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

While loop statement - Ex10_4

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

Reversed Triangle

Space

Asterisks

9

_______

1

_______

8

_______

2

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

While loop statement - Ex10_4

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

Reversed Triangle

Space

Asterisks

9

_______

1

_______

8

_______

2

_______

7

_______

3

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

While loop statement - Ex10_4

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

Reversed Triangle

Space

Asterisks

9

_______

1

_______

8

_______

2

_______

7

_______

3

_______

6

_______

4

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

While loop statement - Ex10_4

Reversed Triangle

Space

Asterisks

9

_______

1

_______

8

_______

2

_______

7

_______

3

_______

6

_______

4

_______

5

_______

5

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

_______

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

While loop statement - Ex10_4

Reversed Triangle

Space

Asterisks

9

_______

1

_______

8

_______

2

_______

7

_______

3

_______

6

_______

4

_______

5

_______

5

_______

4

_______

6

_______

_______

_______

_______

_______

_______

_______

_______

_______

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

While loop statement - Ex10_4

Reversed Triangle

Space

Asterisks

9

_______

1

_______

8

_______

2

_______

7

_______

3

_______

6

_______

4

_______

5

_______

5

_______

4

_______

6

_______

3

_______

7

_______

_______

_______

_______

_______

_______

_______

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

While loop statement - Ex10_4

Reversed Triangle

Space

Asterisks

9

_______

1

_______

8

_______

2

_______

7

_______

3

_______

6

_______

4

_______

5

_______

5

_______

4

_______

6

_______

3

_______

7

_______

2

_______

8

_______

_______

_______

_______

_______

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

While loop statement - Ex10_4

Reversed Triangle

Space

Asterisks

9

_______

1

_______

8

_______

2

_______

7

_______

3

_______

6

_______

4

_______

5

_______

5

_______

4

_______

6

_______

3

_______

7

_______

2

_______

8

_______

1

_______

9

_______

_______

_______

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

While loop statement - Ex10_4

Reversed Triangle

Space

Asterisks

9

_______

1

_______

8

_______

2

_______

7

_______

3

_______

6

_______

4

_______

5

_______

5

_______

4

_______

6

_______

3

_______

7

_______

2

_______

8

_______

1

_______

9

_______

0

_______

10

_______

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

While loop statement - Ex10_4

Write a Python program that prints a reversed triangle consisting of 10 rows of asterisks. The first row should contain 10 asterisk, the second row should contain 9 asterisks, and so on, down to 1 asterisks in the last row, which should be right-justified.

While loop statement - Ex10_5

Example

**********
 *********
  ********
   *******
    ******
     *****
      ****
       ***

        **
         *

Reversed Triangle

Save the file as "XX_YYYY_Ex10_5.py"

Python - While Loop

By Mr Peter

Python - While Loop

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