Data Types / Binary

a basic data type provided by the programming language as a basic building block

• integer • real/float • boolean • character • string

base 10 number. uses the combination of ten symbols to represent any number

base 2 number. uses the combination of 2 symbols (0 or 1) to represent every number

based 16 number. uses the combination of 16 symbols (10 numbers and 6 letters) to represent every number

• easier to read/ remember • quicker to write/type • less chance of making an error • easy to convert

• define colours • in MAC addresses • in assembly language and machine code

any positive or negative whole number e.g. 3, 0, -14

a positive or negative number with a fractional component e.g. 0.002 or -1.98

Any single letter, symbol, number, character or control character

any combination of letters, symbols, numbers, characters or control characters e.g. Hello, £4.56

Any true/ false data types which often represent logical situations

represents + or - + = negative - = positive

positive

negative

positive of the binary point is fixed on the number line

increase the size of the number increase the accuracy of the number

the actual number you want to store

positive of the binary point is fixed on the number line

1) First work out the denary number in the exponent which tells us that the binary point moves ‘n’ places to the right 2) Write out a new binary weighting line with the point in the right place and then convert into denary

right

left

the most significant bit

means that there is only one way to represent the number