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#include <iostream>
/////////////////////////////////////////////////////////////////////////////////////////
typedef long long   T_int;
/////////////////////////////////////////////////////////////////////////////////////////
void    print_number_in_column( T_int   n )
{
    std::cout   <<  (
                        abs(n) < 10
                            ?   n
                            :   print_number_in_column( n / 10 ), abs(n % 10)
                    )
 
                <<  std::endl;
}
/////////////////////////////////////////////////////////////////////////////////////////
int     main()
{
    for(;;)
    {
        T_int   n   =   0;
      //  std::cout   <<  "n = ";
        //std::cin    >>  n;
        n = 12569;
 
        print_number_in_column(n);
        std::cout   <<  std::endl;
    }//for
}

prog.cpp: In function ‘void print_number_in_column(T_int)’:
prog.cpp:10:64: error: third operand to the conditional operator is of type ‘void’, but the second operand is neither a throw-expression nor of type ‘void’
                             :   print_number_in_column( n / 10 ), abs(n % 10)
                                                                ^

Standard output is empty