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16 Cards in this Set
- Front
- Back
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Rational Number |
A number that can be expressed as a fraction |
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Natural Number |
A positive whole number including 0. |
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Irrational number |
A number that cannot be expressed as a fraction. |
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Real number |
Any positive or negative number with or without a fractional part. |
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Ordinal number |
A number used to identify a position relative to other numbers. |
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Cardinal number |
A number that identifies the size of something. |
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Advantages of Floating Point... |
A wider range of numbers can be produced with the same number of bits as the fixed point system. |
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Advantages of Fixed Point |
Processing fixed point numbers is faster as no processing is required to move the binary point. The absolute error will always be the same. This means that the precision is retained. |
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Where would you use fixed point over floating point? |
In situations where speed is more important than precision, such as gaming. Also for applications where a fixed precision is required, such as currency where the number of places after the binary point does not change. |
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Overflow |
When a number is too large to be represented with the bits allocated. |
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Underflow |
When a number is too small to be represented with the bits allocated. |
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Why are floating point numbers normalised? |
So that only one representation of a number is possible and so that the number represented is as precise as it can be in relation to how many bits are being used |
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Analogue Data |
Data that varies in a continuous way. |
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Digital Data |
Data that consists of discrete discontinuous binary digits. |
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Why is the Caesar cipher easy to crack? |
It can be easily cracked using brute force with modern computers. Using frequency analysis, you can look at the most common letters in the ciphertext and compare them to the most common letters used in the English language. |
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Why can the Vernam cipher be considered 100% mathematically secure? |
Each key is randomly generated, and is only used once. |
