foo.c:1:1: warning: data definition has no type or storage class
 c=5
 ^
foo.c:1:1: warning: type defaults to 'int' in declaration of 'c' [-Wimplicit-int]
foo.c:2:1: error: expected ',' or ';' before 'd'
 d=0
 ^

自豪的采用 HydroJudger 进行评测(github.com/hydro-dev/HydroJudger)