CompSystems 245 - Week 1 - Lecture 1, 2 and 3 - Number Systems

Describe what is meant by a number system:

• Definition

• in reference to digital logic

• why we use different number systems for digital systems

Describe the Decimal Number system:

• the digits

  • what each one represents

• the range of an n-digit decimal number

Describe the binary number system:

• the digits

  • what each one represents

• the range of an n digit binary number

• why they are used for computers

Describe the hexadecimal number system:

• the digits

  • what each one represents

• why its used

Describe the conversion of numbers between hexadecimal, deanery and binary systems:

• Write the first 15 numbers of each number system

• 
  

Describe how binary is represented in memory

• Just a pattern of bits

• the CPU determines what a pattern of bits in memory is

Describe integers:

• Range of signed and unsigned numbers depending on whether its a:

  • byte

  • half-word

  • word

  • double word

Describe how integers are represented in 2s complement:

• 2s complement

• How the processor handles 2s complement bits

• 
  

Describe the C number types:

• List them

  • their size

  • maximum values

  • minimum values

Describe how the number types in C are defined:

• their decleration

• use of header files

• how they are used in a source file

Describe Floating point numbers:

• Their purpose

• How they are written

• Breakdown of their bit pattern depending on size

Describe characters in C:

• what they are

• the type of characters used

• how they are defined and used

Describe the special characters in C:

• the special character

  • hexadecimal form

  • what they do

Describe the null terminator in c strings:

• What they do

• what they are

Describe the boolean data type in C:

• how it is defined in C89

• how to make use of it

Describe the sizeof() operator:

• what it returns depending on data type