I'm new to this place. Could someone tell me
why the following code got compile error?

#include <stdio.h>
#include <stdlib.h>

int main(){
  int a, b;
  scanf("%d %d", &a, &b);
  printf("%d\n", a+b);
  return 0;
}

> I'm new to this place. Could someone tell me
> why the following code got compile error?
>
> #include <stdio.h>
> #include <stdlib.h>
>
> int main(){
>   int a, b;
>   scanf("%d %d", &a, &b);
>   printf("%d\n", a+b);
>   return 0;
> }

1. may be you forgotten to put /* @JUDGE_ID: 11573XX 1000 C
*/ at the very first line ? (replace XX with your code)

2. your mailer automatically adds greetings and/or
signature to all outgoing messages, so your message looks
like this:

==============================
Nice to see you, Online Judge!

#include <stdio.h>
int main()
{
.............
}

---
Allen Lam,
Senior Developer,
Chicago, IL 26531
+1(703)287-2397
==============================

that generates errors.
remove greetings, and add //@END_OF_SOURCE_CODE after the
source code.

i have justentered this :
----------------------
#include <stdio.h>
 #include <stdlib.h>

 int main(){
   int a, b;
   scanf("%d %d", &a, &b);
   printf("%d\n", a+b);
   return 0;
 }
------------------------

in web form and got accepted!
Ilya is right, if you use mail, be sure there are no extra
data in your mail.