/in/foo.cc: In function 'void print(bignum)':
/in/foo.cc:82:18: warning: format '%d' expects a matching 'int' argument [-Wformat=]
     printf("%d\n");
                  ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:95:22: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'std::__cxx11::string* {aka std::__cxx11::basic_string<char>*}' [-Wformat=]
         scanf("%d",&s);
                      ^