As an exercise lets see how many different ways we can wish devRant Happy Birthday in code. Try not to copy peoples examples, use a different language or different method.

A couple of examples to start the process:

* LOLCODE *
HAI 1.3
LOL VAR R 3
IM IN YR LOOP
VISIBLE "Happy Birthday"!
IZ VAR LIEK 1?
YARLY
VISIBLE "Dear devRant"!
NOWAI
VISIBLE "to you"!
KTHX
NERFZ VAR!!
IZ VAR LIEK 0?
GTFO
KTHX
KTHX
KTHXBYE

* C *
#include <stdio.h>

#define HP "Happy birthday"
#define TY "to you"
#define DD "Dear devRant"

typedef struct HB_t { const char *s; const char *e;} HB;
static const HB hb[] = {{HP,TY}, {{HP,TY}, {{HP,DD}, {{HP,TY}, { NULL, NULL }};

int main(void)
{
const HB *s = hb;
while(s->start) { printf("%s %s", s->s, s->e); }
return 1;
}

Idea started from rant 477870

A simple one in Python 3: :P

print('Happy Birthday, devRant')

print"Happy Birthday $_"for("to You\n","Dear devRant\n")[0,0,1,0]

foo = "\nHappy Birthday to You"
print( (foo * 3)[:60] + "Dear devRant" + foo )

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static int a[] = {
5,24,50,66,67,77,8,50,59,70,74,64,62,
61,87,2,68,66,3,73,67,77,5,24,54,74,79,
93,8,50,63,78,86,80,82,85,115,2,68,70,
3,73,71,85,5,24,58,82,91,109,8,50,67,
86,98,96,102,109,143,4,20,64,71,99,7,
52,65,94,70,97,122,140,5,24,62,90,103,
125,8,50,71,94,110,112,122,133,171,2,
68,78,3,73,79,101
};
int main(void)
{
const char *t; char st[512]={0};char c;
int e=0,i=0,y=0,u=0,n,m,l=sizeof(a)/sizeof(int);
while(l>i){
int m=n=a[i];i++;y++;
while(n){c=((a[i]-(m-n?y*(m-n):0))+'0');st[e]=c;e++;n--;i++;}
u++;
if(i!=l){st[e]=!(u%4)?',':' ';e++;}
if(!(u%4)){st[e]='\n';e++;}
}
printf("%s",st);
return 1;
}

$ gcc -o hb hb.c && ./hb
Happy birthday to you,
Happy birthday to you,
Happy birthday Dear devRant,
Happy birthday to you

@aadarsh977 what happened to the rest of the song?

@jonjo Oh! I forgot that.

F#:

let happyBirthday () = printfn "Happy Birthday to you!"

happyBirthday()
happyBirthday()
printfn "Happy Birthday, dear devRant!"
happyBirthday()

// Java

class Application {
private static String[] songLines = {
"Happy birthday to you",
"Happy birthday to you",
"Happy birthday dear devRant",
"Happy birthday to you"
};
public static main(String[] args) {
for ( String line : songLines) {
System.out.println(line);
}
}
}

#import <Foundation/Foundation.h>

int main()
{
/*obj-c is weird */
NSLog("Happy birthday!");

Return 0;
}

Get sum brainfuck:

>++++++++++
[
>+++++++
>++++++++++
>+++
>+
<<<<-
]
>++.
>---.
+++
<<+++
[
>>++++
<<-
]
>>..
+++++++++.
>++.
<-----------------------.
+++++++.
+++++++++.
++.
------------.
----.
---.
<<+++
[
>> ++++++++
<<-
]
>>.

@daintycode now I need to work out brainfuck to see your output lol