Number Conversion

1
Number Conversion

• Binary 0,1
  Base2
• Decimal 0,1,2,3,4,5,6,7,8,9 Base10
• Octal 0,1,2,3,4,5,6,7 Base8
• Hexadecimal 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F
  Base 16

2
Converting From Decimal to Binary

• Dividing decimal number by 2.
• Example Convert 123 into binary.

3
Converting Decimal To Octal

• Dividing decimal number by 8.
• Example Convert 123 into octal.

4
Converting Decimal To Hexadecimal

• Dividing decimal number by 16.
• Example Convert 123 into hex.

5
Converting Hexadecimal to Binary

• Using the number table.
• Convert 1AB to binary.

6
Converting Octal to Binary

• Using the same table.
• Convert 175 to binary.

7
Binary to Decimal

• For each digit, multiply by 2 to the power of the
  digit position.
• Convert 10111 to decimal.

8
Octal to Decimal

• For each digit, multiply by 8 to the power of the
  digit position.
• Convert 163 to decimal.

9
Hexadecimal to Decimal

• For each digit, multiply by 16 to the power of
  the digit position.
• Convert 1AC to decimal.

10
Python- Numbers

• Integer 1, 2,9,-1,100
• Float 1.2,10.13, 3.141596
• Operations on numbers , -, , , and /

11
Python- String

• word 'hello world'
• Strings can be subscripted
• word1 will give 'e'
• word03 will give 'hel'
• word4 will give 'hell'
• strings cannot be changed !
• word1 'E' is invalid!!!

12
Python - List

• a 'spam', 'eggs', 100, 1234
• a0 will give 'spam'
• a3 will give 1234
• a2 'bacon', 22 will give 'spam', 'eggs',
  'bacon', 4
• List can be modified. A1 12345 will give
  'spam', 12345, 100, 1234

13
Python - Dictionary

• A dictionary is collection of ltkey, valuegt pairs.
• MyDictionary "one" 2, "two" 3
• .items() return a copy of the dictionarys list
  of (key, value) pairs.

14
Python - Sequence Types

• We call string, list, and dictionary Sequence
  Types.
• Operations
• x in s True if an item of x is in s, else False
• x not in s False if an item of x is in s, else
  True
• s t the concatenation of s and t
• len(s) length of s

15
Convert String to numbers

• S '1', to convert S into integer
  whatever_the_name_you_like int(S). To convert
  S into float X float(S)?