/in/foo.c: In function 'main':
/in/foo.c:8:2: error: expected ';' before 'printf'
  printf("\n");
  ^~~~~~
/in/foo.c:9:2: warning: implicit declaration of function 'sanf' [-Wimplicit-function-declaration]
  sanf("2019 1 1")
  ^~~~
/in/foo.c:10:1: error: expected ';' before '}' token
 }
 ^
/in/foo.c:5:8: warning: variable 'num' set but not used [-Wunused-but-set-variable]
    int num;
        ^~~