foo.c: In function 'main':
foo.c:4:15: warning: statement with no effect [-Wunused-value]
 {             4
               ^
foo.c:5:5: error: expected ';' before 'printf'
     printf("9---\n");
     ^~~~~~
foo.c: At top level:
foo.c:6:15: error: expected identifier or '(' before numeric constant
 }             3
               ^

自豪的采用jd5进行评测(github.com/masnn/jd5)