/in/foo.c: In function 'main':
/in/foo.c:6:8: warning: missing terminating " character
  scanf("%d%d,&a,&b);
        ^
/in/foo.c:6:8: error: missing terminating " character
  scanf("%d%d,&a,&b);
        ^~~~~~~~~~~~~
/in/foo.c:8:12: error: expected ')' before ';' token
     sum=a+b;
            ^
/in/foo.c:10:15: error: stray '\' in program
  printf(sum=%d\n",sum);
               ^
/in/foo.c:10:17: warning: missing terminating " character
  printf(sum=%d\n",sum);
                 ^
/in/foo.c:10:17: error: missing terminating " character
  printf(sum=%d\n",sum);
                 ^~~~~~~
/in/foo.c:8:5: warning: passing argument 1 of 'scanf' makes pointer from integer without a cast [-Wint-conversion]
     sum=a+b;
     ^~~
In file included from /usr/include/features.h:364:0,
                 from /usr/include/stdio.h:27,
                 from /in/foo.c:1:
/usr/include/stdio.h:448:12: note: expected 'const char * restrict' but argument is of type 'int'
 extern int __REDIRECT (scanf, (const char *__restrict __format, ...),
            ^
/in/foo.c:12:1: error: expected declaration or statement at end of input
 }
 ^