📅 最后修改于: 2020-11-04 07:48:28 🧑 作者: Mango
序列由大括号{}中的对象列表表示，并用逗号分隔。一个序列可以同时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
可以通过在方括号中给出元素编号来选择序列中的单个元素。元素编号从1开始。
例如，如果x包含{5，7.2，9，0.5，13}，则x [2]为7.2。
假设x [2]包含{11,22,33}，现在，如果要求x [2]，则得到{11,22,33}，如果要求x [2] [3]，则得到原子33 。
#!/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
在这里，length()是内置函数，该函数返回序列的长度。上面的示例产生以下结果-
value of x[1] = 1
value of x[2] = 2
value of x[3] = 3
value of x[4] = 4
的就是一个字符序列。可以通过两种方式之一输入-
(a)使用双引号-
"ABCDEFG"
(b)使用原始字符串表示法-
-- Using back-quotes
`ABCDEFG`
or
-- Using three double-quotes
"""ABCDEFG"""
您可以尝试以下示例以了解概念-
#!/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
字符串数组可以使用Sequences实现，如下所示：
#!/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
可以使用序列实现以下结构-
#!/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]} )
这产生以下结果-
First Name = John, Last Name = Smith
可以直接对序列执行各种操作。让我们详细了解它们-
当应用于序列时，一元运算运算符实际上应用于序列中的每个元素，以产生具有相同长度的结果序列。
#!/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
几乎可以对序列执行所有算术运算，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")
这产生以下结果-
Value of a = {11,22,33,}
Value of b = {-9,-18,-27,}
Value of c = {3,6,9,}
用户可以将命令行选项传递给Euphoria脚本，并且可以使用command_line()函数按序列访问它，如下所示：
#!/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Euphoria的内置函数。现在，如果您按以下方式运行此脚本，请执行以下操作：
$eui test.ex "one" "two"
这产生以下结果-
Interpeter Name: /home/euphoria-4.0b2/bin/eui
Script Name: test.ex
First Argument: one
Second Argument: two