foo.cc: In function 'int main()':
foo.cc:6:3: warning: left operand of comma operator has no effect [-Wunused-value]
  1<=A,B<=50000;
  ~^~~
foo.cc:6:8: warning: right operand of comma operator has no effect [-Wunused-value]
  1<=A,B<=50000;
       ~^~~~~~~
foo.cc:7:10: warning: 'A' is used uninitialized in this function [-Wuninitialized]
  cout<<A*B<<endl;
          ^
foo.cc:7:10: warning: 'B' is used uninitialized in this function [-Wuninitialized]

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