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

C:
pasted 4 hours ago: 
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#include <stdio.h>

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

    return 0;
}
view (8 lines, 1 line of output)
pasted 4 hours ago: 
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#include <stdio.h>

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

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


C++:
pasted yesterday: 
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// Your First C++ Program

#include <iostream>

int main() {
    std::cout << "Hello World!";
    return 0;
}
view (8 lines, 1 line of output)
pasted yesterday: 
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// Your First C++ Program

#include <iostream>

int main() {
    std::cout << "Hello World!";
    return 0;
}
view (8 lines, 1 line of output)


Haskell:
pasted on Sep 22: 
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main = do { putStrLn "Hello World"; }
view (1 line, 1 line of output)
pasted on Jun 13: 
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main = do { putStrLn "Hello World"; }
view (1 line, 1 line of output)


Lua:
pasted on Sep 21: 
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print ("Hello World!")
view (1 line, 1 line of output)
pasted on Sep 21: 
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 print('hello world')
view (1 line, 1 line of output)


OCaml:
pasted on Apr 10: 
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print_endline "Hello World!"
view (1 line, 1 line of output)


PHP:
pasted on Sep 28: 
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<?php

echo "Hello World!" . PHP_EOL;
view (3 lines, 1 line of output)
pasted on Sep 28: 
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<?php

echo "Hello World!" . PHP_EOL;
view (3 lines, 1 line of output)


Perl:
pasted on Jun 7: 
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print "Hello World"
view (1 line, 1 line of output)
pasted on Apr 6: 
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print "Hello World\n";
view (1 line, 1 line of output)


Python:
pasted yesterday: 
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print("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)


Ruby:
pasted on Jul 31: 
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puts "Hello, World!"
view (1 line, 1 line of output)
pasted on Jul 14: 
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a = 'hello world'

print a
view (3 lines, 1 line of output)


Scheme:
pasted on Sep 22: 
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(display "Hello, World!")
view (1 line, 1 line of output)
pasted on Aug 6: 
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(display "Hello, World!")
view (1 line, 1 line of output)