/in/foo.c: In function 'main':
/in/foo.c:9:7: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
  int i.j;
       ^
/in/foo.c:9:7: error: expected expression before '.' token
/in/foo.c:10:6: error: 'i' undeclared (first use in this function)
  for(i=0; i<10000; i++)
      ^
/in/foo.c:10:6: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:12:7: error: 'j' undeclared (first use in this function)
   for(j=0; j<3; j++)
       ^
/in/foo.c:8:6: warning: variable 'a' set but not used [-Wunused-but-set-variable]
  int a[10000][3];
      ^