1. The data typeThe basic data type
Integer
Integer - int - 4 (characters)
Long, long int 8
-Short integer - short int - 2
The decimal (floats)
Single precision - float - 4
Double - doublt - 8 characters - char - 1
Composite data type
Structure
Enumeration sharing body
2 what are variables?
Nature: a storage space in memory
3. How to variable naming? By letters, Numbers or an underscore, and the beginning must be composed of letters or slip line; And cannot be the same as the key,

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