foo.cc: In function 'int main()':
foo.cc:7:2: error: expected initializer before 'cin'
  cin>>huida;
  ^~~
foo.cc:8:8: error: 'huida' was not declared in this scope
  cout<<huida;
        ^~~~~

自豪的采用jd5进行评测(github.com/masnn/jd5)