Encoding: Integers

1. How to get more values ?

• 2 octets = 0..2^16=65536 or +/-32768 with a sign bit
• 4 octets = 0..2^32 = 4.10^9 or +/-2.10^9
• 8 octets = 0..2^64

2. Need of "types"

• character = 1 octet = {'a','0',...}
• short value = 2 octets
• integer = 4 octets
• long value = 8 octets
• short, int and long can have an unsigned modifier

(Sample code)

3. Standard operators on int, short or long (and also char !)

• arithmetic: +, -, *, /, %
• relational: <, ==, !=, <=,...

Nb. integers also represents boolean values: 1=true, other=false.

10 - 15