foo.cc: In function 'int main()':
foo.cc:7:9: warning: 'n' is used uninitialized in this function [-Wuninitialized]
    7 |  while(n>0)
      |        ~^~
foo.cc:12:8: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   12 |  cout<<d<<endl;
      |        ^

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