foo.cc: In function 'int max(int*, int, int)':
foo.cc:20:11: warning: left operand of comma operator has no effect [-Wunused-value]
  return m,z;
           ^
foo.cc: In function 'int main()':
foo.cc:53:15: warning: left operand of comma operator has no effect [-Wunused-value]
  h,d=max(a,n,k);
               ^
foo.cc: In function 'int max(int*, int, int)':
foo.cc:20:11: warning: 'z' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return m,z;
           ^
foo.cc: In function 'int main()':
foo.cc:59:4: warning: 'z' may be used uninitialized in this function [-Wmaybe-uninitialized]
   d=d/10;
   ~^~~~~

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