julia 编程语言

Julia中的变量 (Variables in Julia)

Just like other programming languages, in Julia variables are the name of memory blocks that are associated (or bound) to a value. It is useful when a value to be stored or to be accessed in/from memory locations.

就像其他编程语言一样，在Julia中，变量是与值关联(或绑定)的内存块的名称。 在存储位置或从存储位置访问或存储值时很有用。

声明变量的规则 (Rules to declare a variable)

• A variable name must be started with:

  变量名称必须以以下内容开头：

  • a letter (A to Z/a to z), or
  • an underscore (_), or
  • a subset of Unicode code points greater than 00A0

• A variable name must not contain any special character (exception some of the character in special cases).

  变量名不得包含任何特殊字符(特殊情况下某些字符除外)。

• Digits (0-9) can be used in the variable name (not as a starting letter)

  可以在变量名称中使用数字(0-9)(不能用作起始字母)

变量命名约定 (Variable naming conventions)

For a better programming style in Julia, we should remember the following points,

为了使用Julia更好的编程风格，我们应该记住以下几点，

• Variable names should be in lowercase

  变量名应小写

• Instead of using space as a word separator in variable names, we should use underscore (_).

  不要使用空格作为变量名称中的单词分隔符，而应使用下划线(_)。

• Types names and Modules names should be started with a capital letter (uppercase), if the variable name is long (used multiple words) then for word separation, we should not use underscore (-), instead of using underscore (_) use the first letter as capital (uppercase) of each word.

  类型名称和模块名称应以大写字母开头(大写)，如果变量名称很长(使用多个单词)，则为了进行单词分隔，我们不应使用下划线(-)，而应使用下划线(_)使用第一个字母作为每个单词的大写(大写)。

• Functions and macros names should be in lowercase without word separation.

  函数和宏的名称应为小写字母，且不要单词分隔。

声明变量并赋值 (Declaring a variable and Assigning values)

Since Julia does not support data type with the global variables, the variable automatically detects its type based on the given values.

由于Julia不支持全局变量的数据类型，因此变量会根据给定的值自动检测其类型。

Example:

例：

# variables
a = 10
b = 10.23
c = 'c'
d = "Hello"
# printing the values
println("Initial values...")
println("a: ", a)
println("b: ", b)
println("c: ", c)
println("d: ", d)
# updating the values 
a = a + 10
b = b + 12
c = 'x'
d = "world!"
# printing the values
println("After updating...")
println("a: ", a)
println("b: ", b)
println("c: ", c)
println("d: ", d)

Output

输出量

Initial values...
a: 10
b: 10.23
c: c
d: Hello
After updating...
a: 20
b: 22.23
c: x
d: world!

Reference: https://docs.julialang.org

参考： https : //docs.julialang.org

翻译自: https://www.includehelp.com/julia/variables.aspx

julia 编程语言