Nasal Hello World: Difference between revisions
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In the programming world, a "Hello, World!" program is used to illustrate basic syntax using a very simple program. The '''"Hello, World!" program in [[Nasal]]''' would look like this: | |||
<syntaxhighlight lang="nasal"> | <syntaxhighlight lang="nasal"> | ||
print('Hello World!'); | print('Hello World!'); | ||
</syntaxhighlight> | </syntaxhighlight> |
Revision as of 16:45, 18 October 2016
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Nasal scripting |
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Nasal internals |
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Memory Management (GC) |
In the programming world, a "Hello, World!" program is used to illustrate basic syntax using a very simple program. The "Hello, World!" program in Nasal would look like this:
print('Hello World!');
This will show the "Hello World" string during startup in the console window. The hash sign (#) just introduces comments (i.e. will be ignored by the interpreter).
Note: Script-specific symbols such as global variables (or functions) will be put into a scope (namespace) based on the script's name, scripts embedded via aircraft-set.xml files can separately specify a corresponding module name (see Howto: Make an aircraft for details).
Strings in Nasal can also use double quotes which support escaping:
# hello.nas
print("Hello\nWorld!");
Double quotes support some of the typical escape sequences:
- \n Newline
- \t Horizontal Tab
- \r Carriage Return
- \\ Backslash
- \" Double quote
- \xyy Hexadecimal-specified character (yy stands for two hexadecimal digits; \x is literal)
For example, to print a new line, use:
print ("\n");
To print a quoted string, use:
print ("\"quoted string\"");
and so on.
Single quotes treat everything as literal except for embedded single quotes (including embedded whitespace like newlines).
Nasal strings are always arrays of bytes (never characters: see the utf8 library if you want character-based equivalents of substr() et. al.). They can be indexed just like in C (although note that there is no nul termination -- get the length with size()):