foo.cc: In function 'int main()':
foo.cc:10:3: warning: 'm' is used uninitialized in this function [-Wuninitialized]
  i=m;
  ~^~
foo.cc:11:22: warning: 'n' is used uninitialized in this function [-Wuninitialized]
  while (((m%i!=0)&&(n%i!=0))||((m%i==0)&&(n%i!=0))||((m%i!=0)&&(n%i==0)))
                     ~^~

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