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Listed below are example programs that print "hello world", written in the following languages:
[ C | C++ | Haskell | Lua | PHP | Perl | Python | Ruby | Scheme ]

C:
pasted yesterday: 
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#include <stdio.h>

int main(void) {
    printf("hello world");
    return 0;
}
view (6 lines, 1 line of output)
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#include <stdio.h>

int main()
{
    printf("Hello, world!\n");

    return 0;
}
view (8 lines, 1 line of output)


C++:
pasted 8 hours ago: 
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#include <iostream>
using namespace std;
int main()
{
    cout << "Hello world!";
    return 0;
}
view (7 lines, 1 line of output)
pasted 8 hours ago: 
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#include <iostream>
using namespace std;
int main()
{
    cout << "Hello world!";
    return 0;
}
view (7 lines, 1 line of output)


Haskell:
pasted on Aug 15: 
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main = putStrLn "Hello, World"
view (1 line, 1 line of output)
pasted on Aug 15: 
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main = putStrLn "Hello, World"
view (1 line, 1 line of output)


Lua:
pasted on Oct 14: 
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print ("hello world!")
view (1 line, 1 line of output)
pasted on Sep 28: 
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print ("hello world")
view (2 lines, 1 line of output)


PHP:
pasted on Oct 13: 
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<?php
$str = "<h1>Hello World</h1>";

$newstr = filter_var($str, FILTER_SANITIZE_STRING);
echo $newstr;

echo $data;
view (7 lines, 1 line of output)
pasted on Oct 13: 
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<?php
$str = "<h1>Hello World</h1>";

$newstr = filter_var($str, FILTER_SANITIZE_STRING);
echo $newstr;
view (5 lines, 1 line of output)


Perl:
pasted yesterday: 
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print STDERR "Hello World\n";
view (1 line, 1 line of output, 13 comments)
pasted on Aug 15: 
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print "Hello world!";
view (1 line, 1 line of output)


Python:
pasted yesterday: 
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print("Hello World")
view (1 line, 1 line of output)
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def main ():

    print ("Hello world!")

main()
view (5 lines, 1 line of output)


Ruby:
pasted on Oct 7: 
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puts "hello world"
view (1 line, 1 line of output)
pasted on Sep 30: 
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print "Hello, World!";
view (1 line, 1 line of output)


Scheme:
pasted on Oct 5: 
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(display "Hello, World!")
view (1 line, 1 line of output, 1 comment)
pasted on Aug 10: 
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(display "Hello world!")
view (1 line, 1 line of output)