Error(s):

source_file.c: In function ‘main’:
source_file.c:6:15: error: invalid application of ‘sizeof’ to a function type [-Wpointer-arith]
         sizeof(main)
               ^
source_file.c:4:14: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
     printf ( "%d %d\n",
              ^
source_file.c:4:14: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long unsigned int’ [-Wformat=]