📅 最后修改于: 2020-11-04 07:56:29 🧑 作者: Mango
提供了大量的库例程。有些内置在解释器中，例如ex.exe，exw.exe或exu 。其他文件则用Euphoria编写，您必须在euphoria \ include目录中包含一个.e文件才能使用它们。
为了指示可以传递和返回哪种对象，使用了以下前缀-
| S.No | Prefix & Description |
|---|---|
| 1 | x
a general object (atom or sequence) |
| 2 | s
a sequence |
| 3 | a
an atom |
| 4 | i
an integer |
| 5 | fn
an integer used as a file number |
| 6 | st
a string sequence, or single-character atom |
除了使用这些类型声明变量之外，您还可以像普通函数一样调用它们，以测试值是否为特定类型。
| integer | − | test if an object is an integer |
| atom | − | test if an object is an atom |
| sequence | − | test if an object is a sequence |
| object | − | test if an object is an object (always true) |
| length | − | return the length of a sequence |
| repeat | − | repeat an object n times to form a sequence of length n |
| reverse | − | reverse a sequence |
| append | − | add a new element to the end of a sequence |
| prepend | − | add a new element to the beginning of a sequence |
| compare | − | compare two objects |
| equal | − | test if two objects are identical |
| find | − | find an object in a sequence – start searching from element number 1 |
| find_from | − | find an object in a sequence – start searching from any element number |
| match | − | find a sequence as a slice of another sequence – start searching from element number 1 |
| match_from | − | find a sequence as a slice of another sequence – start searching from any element number |
| sort | − | sort the elements of a sequence into ascending order |
| custom_sort | − | sort the elements of a sequence based on a compare function that you supply |
| lower | − | convert an atom or sequence to lower case |
| upper | − | convert an atom or sequence to upper case |
| wildcard_match | − | match a pattern containing ? and * wildcards |
| wildcard_file | − | match a file name against a wildcard specification |
这些例程可以应用于单个原子或值序列。
| sqrt | − | calculate the square root of an object |
| rand | − | generate random numbers |
| sin | − | calculate the sine of an angle |
| arcsin | − | calculate the angle with a given sine |
| cos | − | calculate the cosine of an angle |
| arccos | − | calculate the angle with a given cosine |
| tan | − | calculate the tangent of an angle |
| arctan | − | calculate the arc tangent of a number |
| log | − | calculate the natural logarithm |
| floor | − | round down to the nearest integer |
| remainder | − | calculate the remainder when a number is divided by another |
| power | − | calculate a number raised to a power |
| PI | − | the mathematical value PI (3.14159…) |
这些例程将数字视为二进制位的集合，并对数字的二进制表示形式中的相应位执行逻辑运算。
没有用于向左或向右移位位的例程，但是您可以通过乘以或除以2的幂来获得相同的效果。
| and_bits | − | perform logical AND on corresponding bits |
| or_bits | − | perform logical OR on corresponding bits |
| xor_bits | − | perform logical XOR on corresponding bits |
| not_bits | − | perform logical NOT on all bits |
要在文件或设备上进行输入或输出，必须首先打开文件或设备，然后使用下面的例程对其进行读写，然后关闭文件或设备。 open()将为您提供一个文件号，以用作其他I / O例程的第一个参数。某些文件/设备会自动为您打开(作为文本文件)-
| open | − | open a file or device |
| close | − | close a file or device |
| flush | − | flush out buffered data to a file or device |
| lock_file | − | lock a file or device |
| unlock_file | − | unlock a file or device |
| − | print a Euphoria object on one line, with braces and commas {,,} to show the structure | |
| pretty_print | − | print a Euphoria object in a nice readable form, using multiple lines and appropriate indentation |
| ? x | − | shorthand for print(1, x) |
| sprint | − | return a printed Euphoria object as a string sequence |
| printf | − | formatted print to a file or device |
| sprintf | − | formatted print returned as a string sequence |
| puts | − | output a string sequence to a file or device |
| getc | − | read the next character from a file or device |
| gets | − | read the next line from a file or device |
| get_bytes | − | read the next n bytes from a file or device |
| prompt_string | − | prompt the user to enter a string |
| get_key | − | check for key pressed by the user, don’t wait |
| wait_key | − | wait for user to press a key |
| get | − | read the representation of any Euphoria object from a file |
| prompt_number | − | prompt the user to enter a number |
| value | − | read the representation of any Euphoria object from a string |
| seek | − | move to any byte position within an open file |
| where | − | report the current byte position in an open file |
| current_dir | − | return the name of the current directory |
| chdir | − | change to a new current directory |
| dir | − | return complete info on all files in a directory |
| walk_dir | − | recursively walk through all files in a directory |
| allow_break | − | allow control-c/control-Break to terminate your program or not |
| check_break | − | check if user has pressed control-c or control-Break |
在Windows XP上，如果希望DOS鼠标在(非全屏)窗口中工作，则必须在DOS窗口的“属性”中禁用“快速编辑”模式。
| get_mouse | − | return mouse “events” (clicks, movements) |
| mouse_events | − | select mouse events to watch for |
| mouse_pointer | − | display or hide the mouse pointer |
| time | − | number of seconds since a fixed point in the past |
| tick_rate | − | set the number of clock ticks per second (DOS32) |
| date | − | current year, month, day, hour, minute, second etc. |
| command_line | − | command-line used to run this program |
| getenv | − | get value of an environment variable |
| system | − | execute an operating system command line |
| system_exec | − | execute a program and get its exit code |
| abort | − | terminate execution |
| sleep | − | suspend execution for a period of time |
| platform | − | find out which operating system are we running on |
| machine_func | − | specialized internal operations with a return value |
| machine_proc | − | specialized internal operations with no return value |
| trace | − | dynamically turns tracing on or off |
| profile | − | dynamically turns profiling on or off |
以下例程可让您在屏幕上显示信息。在DOS中，可以将PC屏幕置于许多图形模式之一。
以下例程适用于所有文本和像素图形模式。
| clear_screen | − | clear the screen |
| position | − | set cursor line and column |
| get_position | − | return cursor line and column |
| graphics_mode | − | select a new pixel-graphics or text mode (DOS32) |
| video_config | − | return parameters of current mode |
| scroll | − | scroll text up or down |
| wrap | − | control line wrap at right edge of screen |
| text_color | − | set foreground text color |
| bk_color | − | set background color |
| palette | − | change color for one color number (DOS32) |
| all_palette | − | change color for all color numbers (DOS32) |
| get_all_palette | − | get the palette values for all colors (DOS32) |
| read_bitmap | − | read a bitmap (.bmp) file and return a palette and a 2-d sequence of pixels |
| save_bitmap | − | create a bitmap (.bmp) file, given a palette and a 2-d sequence of pixels |
| get_active_page | − | return the page currently being written to (DOS32) |
| set_active_page | − | change the page currently being written to (DOS32) |
| get_display_page | − | return the page currently being displayed (DOS32) |
| set_display_page | − | change the page currently being displayed (DOS32) |
| sound | − | make a sound on the PC speaker (DOS32) |
以下例程仅在模式下以文本形式工作
| cursor | − | select cursor shape |
| text_rows | − | set number of lines on text screen |
| get_screen_char | − | get one character from the screen |
| put_screen_char | − | put one or more characters on the screen |
| save_text_image | − | save a rectangular region from a text screen |
| display_text_image | − | display an image on the text screen |
以下例程仅在像素图形模式下工作(DOS32)
| pixel | − | set color of a pixel or set of pixels |
| get_pixel | − | read color of a pixel or set of pixels |
| draw_line | − | connect a series of graphics points with a line |
| polygon | − | draw an n-sided figure |
| ellipse | − | draw an ellipse or circle |
| save_screen | − | save the screen to a bitmap (.bmp) file |
| save_image | − | save a rectangular region from a pixel-graphics screen |
| display_image | − | display an image on the pixel-graphics screen |
| task_clock_start | − | restart the scheduler’s clock |
| task_clock_stop | − | stop the scheduler’s clock |
| task_create | − | create a new task |
| task_list | − | get a list of all tasks |
| task_schedule | − | schedule a task for execution |
| task_self | − | return the task id of the current task |
| task_status | − | the current status (active, suspended, terminated) of a task |
| task_suspend | − | Suspend a task. |
| task_yield | − | Yield control, so the scheduler can pick a new task to run. |