Term
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Definition
Integer - whole number
string - sequence of characters
float - decimal places
Boolean - True or False |
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Term
Weakly typed language
Strongly typed language |
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Definition
Weakly - focus on being convenient. Generally achieved by making it easy to mix different data types together. Tries to work things out for you.
Strongly - focus on being safe. Conversions must be done explicitly. Programmer must consider and manually convert
Most languages are in the middle |
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Term
Static typing
Dynamic typing |
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Definition
language requires you to declare and adhere to the data types and variables (C, java) Assigning a different type will result in an error.
Dynamic - variables data type is determined by the data assigned. |
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Term
| Values that equate to True |
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Definition
Anything that is not zero
bool(5)
bool(-5)
bool('5') |
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Term
| Values that equate to False |
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Definition
bool(0)
bool(0.0)
bool('')
bool[] |
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Term
| Concatenation of strings and numbers |
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Definition
python: convert number to a string and then concatenate (explicit) unless you use print()
Java - coerces both values into strings and concatenates them |
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Term
| Why is knowing data types important? |
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Definition
- dictates what you can do with the it
- how/if you can mix data types
- what you need to test (all of it)! |
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Term
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Definition
Selection statements. Instead of running from beginning to end, it runs certain parts of the code based on conditions being true (Boolean).
Draw flowchart
value = int(input('Enter number:')
if value <= 100:
print (value)
pseudocode for other languages |
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Term
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Definition
Another selection statement. Run one section of code if the Boolean expression is true and another if false.
Draw flowchart
Other languages |
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Term
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Definition
Chain selection statements together. Looks for the code following the first True condition and runs that
Draw flowchart |
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Term
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Definition
and - true of both true
or - true if one is true
not - reverse |
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Term
| comparison or relational operators |
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Definition
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Term
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Definition
Not in python. if your conditions all check for different values of the same thing, a switch statement can be used instead of else-ifs
draw flowchart |
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Term
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Definition
| built in functions that can only be used on strings. Allows you to manipulate strings or determine information about a string eg. isalpha(), islower() |
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