foo.cc: In function 'int main()':
foo.cc:10:13: warning: left operand of comma operator has no effect [-Wunused-value]
   10 |         if(x>0,y>0)
      |            ~^~
foo.cc:12:18: warning: left operand of comma operator has no effect [-Wunused-value]
   12 |         else if(x<0,y>0)
      |                 ~^~
foo.cc:14:18: warning: left operand of comma operator has no effect [-Wunused-value]
   14 |         else if(x<0,y<0)
      |                 ~^~
foo.cc:16:18: warning: left operand of comma operator has no effect [-Wunused-value]
   16 |         else if(x>0,y<0)
      |                 ~^~

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