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#!/usr/bin/dmd -run
/* sh style script syntax is supported */
/* Hello World in D
To compile:
dmd hello.d
or to optimize:
dmd -O -inline -release hello.d
*/
/+
a nested /+
comment
+/
+/
a = /+ // +/ 1; // parses as if 'a = 1;'
a = /+ "+/" +/ 1"; // parses as if 'a = " +/ 1";'
a = /+ /* +/ */ 3; // parses as if 'a = */ 3;'
r"hello"
r"c:\root\foo.exe"
r"ab\n" // string is 4 characters, 'a', 'b', '\', 'n'
`hello`
`c:\root\foo.exe`
`ab\n` // string is 4 characters, 'a', 'b', '\', 'n'
x"0A" // same as "\x0A"
x"00 FBCD 32FD 0A" // same as "\x00\xFB\xCD\x32\xFD\x0A"
"hello"c // char[]
"hello"w // wchar[]
"hello"d // dchar[]
import std.stdio;
void main(string[] args)
{
writefln("Hello World, Reloaded");
// auto type inference and built-in foreach
foreach (argc, argv; args)
{
// Object Oriented Programming
auto cl = new CmdLin(argc, argv);
// Improved typesafe printf
writeln(cl.argnum, cl.suffix, " arg: ", cl.argv);
// Automatic or explicit memory management
delete cl;
}
// Nested structs and classes
struct specs
{
// all members automatically initialized
int count, allocated;
}
// Nested functions can refer to outer
// variables like args
specs argspecs()
{
specs* s = new specs;
// no need for '->'
s.count = args.length; // get length of array with .length
s.allocated = typeof(args).sizeof; // built-in native type properties
foreach (argv; args)
s.allocated += argv.length * typeof(argv[0]).sizeof;
return *s;
}
// built-in string and common string operations
writefln("argc = %d, " ~ "allocated = %d",
argspecs().count, argspecs().allocated);
}
class CmdLin
{
private int _argc;
private string _argv;
public:
this(int argc, string argv) // constructor
{
_argc = argc;
_argv = argv;
}
int argnum()
{
return _argc + 1;
}
string argv()
{
return _argv;
}
string suffix()
{
string suffix = "th";
switch (_argc)
{
case 0:
suffix = "st";
break;
case 1:
suffix = "nd";
break;
case 2:
suffix = "rd";
break;
default:
break;
}
return suffix;
}
}
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