Swift 2.0 Learning Notes (Day 8)-small constants, variable effects

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Computer language learning has constants and variables, they are almost the soul of my code, leaving them I really "can't live"

constants are preceded by identifiers with keywords Let . The amount of constant whose value does not change during use, and the following is the declaration constant:

Let _Hello = "Hello"

note that constants can only be assigned at initialization time, if the _hello Assignment,

For example: _hello = "Hello, World"

The program will make an error.  

Variables come in.

variables are prefixed with the keyword var, which declares the variable:

var scoreforstudent = 0.0

StatementDoubletypescoreforstudentvariable, and initialized to0.0.

If more than one variable is declared and initialized in a statement, all variables have the same data type:

var x = ten, y = 20

In the declaration of multiple variables, you can also specify different data types:

var x = ten, y = True

which x is an integral type, y is a Boolean type.  

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Swift 2.0 Learning Notes (Day 8)-small constants, variable effects