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Euphoria序列

表示序列由大括号{},由逗号分隔的列表中的对象。一个序列可以包含原子和其他序列。例如:

{2, 3, 5, 7, 11, 13, 17, 19}
{1, 2, {3, 3, 3}, 4, {5, {6}}}
{{"Zara", "Ayan"}, 52389, 97.25}
{} -- the 0-element sequence

可以选择一个单一的元素序列,给予在方括号中的元素个数。元素号从1开始。

例如,如果x包含{5,7.2,0.5,13},则x[2]是7.2。假设X[2]包含{11,22,33},现在如果我们问为x[2],我们得到{11,22,33},如果我们要求的X [2] [3]我们得到原子33。

例子:

#!/home/euphoria-4.0b2/bin/eui

sequence x
x = {1, 2, 3, 4}

for a = 1 to length(x) do
   printf(1, "value of x[%d] = %d\n", {a, x[a]})
end for

这里的 length() 是一个兴奋的内置函数,它返回序列的长度。上面的例子会产生以下结果:

value of x[1] = 1
value of x[2] = 2
value of x[3] = 3
value of x[4] = 4

字符串

字符串是一个字符序列。这可能是输入的两种方法中的一个:

(a) 使用双引号:

"ABCDEFG"

(b) 使用raw字符串表示:

-- Using back-quotes
`ABCDEFG`

or

-- Using three double-quotes
"""ABCDEFG"""

尝试下面的例子来理解这个概念:

#!/home/euphoria-4.0b2/bin/eui

sequence x
x = "ABCD"

for a = 1 to length(x) do
   printf(1, "value of x[%d] = %s\n", {a, x[a]})
end for

这将产生以下结果:

value of x[1] = A
value of x[2] = B
value of x[3] = C
value of x[4] = D

字符串数组

String数组,可以实现使用序列如下:

#!/home/euphoria-4.0b2/bin/eui

sequence x = {"Hello", "World", "Euphoria", "", "Last One"}

for a = 1 to length(x) do
   printf(1, "value of x[%d] = %s\n", {a, x[a]})
end for

这将产生以下结果:

value of x[1] = Hello
value of x[2] = World
value of x[3] = Euphoria
value of x[4] =
value of x[5] = Last One

Euphoria 结构

结构可以采用序列如下:

#!/home/euphoria-4.0b2/bin/eui

sequence employee = {
   {"John","Smith"},
    45000,
    27,
    185.5
   }

printf(1, "First Name = %s, Last Name = %s\n", 
                 {employee[1][1],employee[1][2]} )

这将产生以下结果:

First Name = John, Last Name = Smith

直接序列可以执行以下操作:

一元操作:

当应用到序列的一元运算符实际上是应用序列中的每个元素的结果,得到的序列具有相同的长度。

#!/home/euphoria-4.0b2/bin/eui

sequence x
x = -{1, 2, 3, 4}

for a = 1 to length(x) do
   printf(1, "value of x[%d] = %d\n", {a, x[a]})
end for

这将产生以下结果:

value of x[1] = -1
value of x[2] = -2
value of x[3] = -3
value of x[4] = -4

算术运算:

几乎所有的算术运算可以执行的序列,如下所示:

#!/home/euphoria-4.0b2/bin/eui

sequence x, y, a, b, c
x = {1, 2, 3}
y = {10, 20, 30}

a = x + y
puts(1, "Value of a = {")
for i = 1 to length(a) do
   printf(1, "%d,", a[i])
end for
puts(1, "}\n")

b = x - y
puts(1, "Value of b = {")
for i = 1 to length(a) do
   printf(1, "%d,", b[i])
end for
puts(1, "}\n")

c = x * 3
puts(1, "Value of c = {")
for i = 1 to length(c) do
   printf(1, "%d,", c[i])
end for
puts(1, "}\n")

这将产生以下结果:

Value of a = {11,22,33,}
Value of b = {-9,-18,-27,}
Value of c = {3,6,9,}

命令行选项:

用户可以通过命令行选项一个欣快脚本和可以访问它作为一个序列使用的 command_line() 函数如下:

#!/home/euphoria-4.0b2/bin/eui

sequence x

x = command_line()

printf(1, "Interpeter Name: %s\n", {x[1]} )

printf(1, "Script Name: %s\n", {x[2]} )

printf(1, "First Argument: %s\n", {x[3]})

printf(1, "Second Argument: %s\n", {x[4]})

这里的 printf() 是一个Euphoria 的内置函数。现在,如果你运行这个脚本如下: 

$eui test.ex "one" "two"

这将产生以下结果:

Interpeter Name: /home/euphoria-4.0b2/bin/eui
Script Name: test.ex
First Argument: one
Second Argument: two