foo.cc: In function 'bign& operator++(bign&, int)':
foo.cc:243:12: warning: reference to local variable 't' returned [-Wreturn-local-addr]
  243 |     return t;
      |            ^
foo.cc:241:10: note: declared here
  241 |     bign t=a;
      |          ^
foo.cc: In function 'bign& operator--(bign&, int)':
foo.cc:254:12: warning: reference to local variable 't' returned [-Wreturn-local-addr]
  254 |     return t;
      |            ^
foo.cc:252:10: note: declared here
  252 |     bign t=a;
      |          ^
foo.cc: In function 'int main()':
foo.cc:273:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  273 |     scanf("%d %s",&n,s);
      |     ~~~~~^~~~~~~~~~~~~~

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