1. Introduction variables
Variable memory equivalent to a data storage space of representation, you can be seen as a variable room of the house number, street number we can find a room by the same token, you can access the variable (value) by the variable name.
2, quick start, see a case
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3. Note the variables used
1) denotes a variable storage region in the memory
2) The region having its own name (variable name) and type (data type ) diagram:
4, the variables used in three ways Golang
If the assignment after a specified variable type declaration, use the default value: (1) The first
(2) The second: The value of the variable type discretion (push type)
(3) omit var, attention : = variable on the left should not be declared in place, otherwise it will cause a compiler error
(4) multi-variable declaration
How to declare more than one time in [globals go in function external variables is defined in the global variable]
5 data values of the changing region may be (key) within the same type range
(6) In the same scope variables must be unique (in a block of code or function) within
(7) variable = variable name + value + data type, which please note that the three elements of variables
(8) Golang variable if no initial value, the compiler will use the default value, such as int default value 0 string defaults empty string, decimal default is 0
5, variable declaration, initialization and assignment
6, the program using the +
1) When both sides are numeric, do the adder
2) When both sides are strings, the strings do splicing
