foo.cc: In function 'int main()':
foo.cc:6:3: warning: statement has no effect [-Wunused-value]
  a>-10000;
  ~^~~~~~~
foo.cc:7:3: warning: statement has no effect [-Wunused-value]
  c<10000;
  ~^~~~~~
foo.cc:8:10: warning: 'a' is used uninitialized in this function [-Wuninitialized]
  cout<<(a+b)*c<<endl;
        ~~^~~
foo.cc:8:10: warning: 'b' is used uninitialized in this function [-Wuninitialized]
foo.cc:8:14: warning: 'c' is used uninitialized in this function [-Wuninitialized]
  cout<<(a+b)*c<<endl;
              ^

[Hydro](https://hydro.ac)提供评测服务