foo.cc: In function 'int main()':
foo.cc:6:5: warning: left operand of comma operator has no effect [-Wunused-value]
    0<=x,y<=32767;
    ~^~~
foo.cc:6:10: warning: right operand of comma operator has no effect [-Wunused-value]
    0<=x,y<=32767;
         ~^~~~~~~
foo.cc:7:7: warning: 'x' is used uninitialized in this function [-Wuninitialized]
    sum=x+y;
    ~~~^~~~
foo.cc:7:7: warning: 'y' is used uninitialized in this function [-Wuninitialized]

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