Hello world! with limited character repetition

Question

In a language of your choice, write a program that exactly outputs the characters Hello world! followed by a newline. The code:

• should not use any character more than twice (alphanumeric, symbol, whitespace...anything)
• should not use any external resources
• should not use any user input
• should not output anything else

An example of a valid python program:

print("He%so world!"%(2*'l'))

An example of an invalid python program (the character 'r' is used three times):

print("Hel"+chr(108)+'o world!')

Winner is whoever has the most votes after 14 days.

EDIT: A winner has been chosen! Thanks all for your work on this question!

Answer 1

PHP I am amazed at how many people give invalid answers without mentioning they are. My attempt, only reusing o" characters twice.

<?Php EchO "Hello wor\154d!";

Edit: fixed thanks to @FireFly: i understood to use each character once. This is no challenge anymore.

Answer 2

JavaScript (52 characters)

alert(['He\x6C\x6Co world!'][(!1,0)-0], +-1+"Hadtw")

Each character is used 2 times, and it doesn't use any comments!

Edit: I've just posted the same answer here.

Answer 3

Active Server Pages (Classic ASP):

Hel<%REspOnsE.wRite Chr((0<0>-.6&"!")+&H6C+h-dinptO)
%>o world!

---

Each character is used twice!

To run it, you'll need a web server running IIS.

Save it in the site root with a ".asp" extension, make a HTTP request to the server, and you'll see that the response text is exactly "Hello world!" and a new line:

Hello world!

---

Edit: You could also use this smaller code:

Hel<%= Chr((0<0>we=6&"!")+&H6C+hd)
%>o world!

Or this:

Hel<%= CHr((0<1>wedC=8&"!&")++108)
%>o world!

Answer 4

c-41

main(){printf("He%clo world!%c",154,10);}

Answer 5

JavaScript 35

With inspiration from @VisioN

alert(atob("SGVsbG8gV29y")+'ld!\n')

Answer 6

Tcl, 21 bytes

puts Hello\ wor\x6cd!

Try it online!

Answer 7

SmileBASIC

?@H[1]+@e[!0];CHR$(108);"lo world!

Another solution:

CLS?"He__o world!
LOCATE 2,0?@l[1]*2

Answer 8

In C. Choose one of these.

My favourite (crazy but compact in memory):

#include <stdint.h>
printf("%s", (char*)(int32_t[]){1819043144,1870078063,6581362});

For those who like big numbers:

printf("%s", (char*)(int64_t[]){8031924123371070792,43509902450});

Or here the more descriptive versions:

printf("%s", (char*)(int32_t[]){0x6c6c6548,0x6f77206f,0x646c72});
printf("%s", (char*)(int64_t[]){0x6f77206f6c6c6548,0x0a21646c72});

char map:

H  e  l  l     o     w  o     r  l  d  !     <LF>
48 65 6c 6c    6f 20 77 6f    72 6c 64 21    0a
(remember to swap big/little endian bytes when composing)

Btw: why there is no 128 bit integer in C?

printf("%s", (char*)(int128_t[]){0x0a21646c726f77206f6c6c6548});
printf("%s", (char*)(int128_t[]){802616035175250124568770929992}); // string uses only 100 of 128 bits

Answer 9

AWK and echo

EDIT: fix the extra o's following the note. (thanks ProgramFOX)

echo He: | awk -F: '{print $1,Q,"\157 Wor",Q}' OFS=l ORS=d\!

and thanks awk which give me the option to say "-F" instead of "IFS=" (:-)

Answer 10

Java

Okay I found this on SO, it doesn't output a big H

Rare sequence of random stream of digits for 2 specific seeds.
Probably fixed out by brute forcing
One of the SO solutions also include a brute forcer to make your own sequences.

System.out.println(randomString(-229985452) + " " + randomString(-147909649) + "!");

And randomString() looks like this

public static String randomString(int i)
{
    Random ran = new Random(i);
    StringBuilder sb = new StringBuilder();
    for (int n = 0; ; n++)
    {
        int k = ran.nextInt(27);
        if (k == 0)
            break;

        sb.append((char)('`' + k));
    }

    return sb.toString();
}

Source: https://stackoverflow.com/questions/15182496/why-does-this-code-print-hello-world

Answer 11

I think that the only character which is being repeated more than twice is 'l' how about assigning variables

For language C:(Note,i am bad at syntax)

main(){

 char *x=*b='l';

printf("Hel%so wor%sd!",x,b);}

and using them instead of 'l' while printing ??

It's not elegant as the answers already here.But it is fair and simple ?right ??