foo.cc: In function 'void fang(int, int, Bigint&)':
foo.cc:43:6: warning: unused variable 'jw' [-Wunused-variable]
   43 |  int jw=0;
      |      ^~
foo.cc:44:6: warning: unused variable 'j' [-Wunused-variable]
   44 |  int j=0;
      |      ^
foo.cc: In function 'void add(Bigint&, Bigint&, Bigint&)':
foo.cc:56:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   56 |  if(a2.n<min)
      |  ^~
foo.cc:58:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   58 |   int i;
      |   ^~~

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