1.4.1: Data Types Flashcards

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1
Q

Why is it essential to store data as the right data type?

A
  • So the right operations can be performed on it
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2
Q

What is an Integer?

A
  • A whole number
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3
Q

What are Integers used for?

A
  • Counting things
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4
Q

What are Real numbers useful for?

A
  • Measuring things
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5
Q

What is a Real number?

A
  • A positive or negative number which can, but does not necessarily, have a fractional part
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6
Q

What is a Character?

A
  • A single symbol used by a computer
  • Letters A to Z, the numbers 0 to 9, and other symbols such as punctuation and characters from other languages
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7
Q

What is a String?

A
  • A collection of characters
  • Can be used to store either a single character or many characters in succession
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8
Q

What are Strings useful for?

A
  • Storing text and phone numbers, which start with 0, which numeric data types such as integers would cut off
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9
Q

What is Boolean?

A
  • True or False
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10
Q

What is Boolean useful for?

A
  • Recording data that can only take two values, like the state of a power button or whether a line of code has been executed
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11
Q

What is a Character Set?

A
  • A published collection of codes and corresponding characters which can be used by computers for representing text
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12
Q

What is ASCII?

A
  • American Standard Code for Information Interchange
  • Normal ASCII uses 7 bits to represent 128 characters
  • Extended ASCII uses 8 bits to represent 256 characters (The first 128 codes code are the same as in normal ASCII)
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13
Q

How many bits does Unicode utilise?

A
  • A varying number of bits ranging from 16 to 32, allowing for over 1 million different characters, many of which have yet to be allocated
  • Unicode has enough capacity to represent a wealth of different languages, symbols, and emojis
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