foo.c: In function 'main':
foo.c:6:10: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf("%d%d",a,b);
         ~^
foo.c:6:12: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'int' [-Wformat=]
  scanf("%d%d",a,b);
           ~^
foo.c:6:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",a,b);
  ^~~~~~~~~~~~~~~~~
foo.c:6:2: warning: 'a' is used uninitialized in this function [-Wuninitialized]
  scanf("%d%d",a,b);
  ^~~~~~~~~~~~~~~~~
foo.c:6:2: warning: 'b' is used uninitialized in this function [-Wuninitialized]

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。