... (hexadecimal) in iostreams · 22 5hex( ) · 21 8hexadecimal · 21 7hierarchy: object-based hierarchy · 622 II/O: and threads, blocking · 767; console · 18 8ifstream · 1 82, 19 6, 20 2ignore( ) · 19 8 in- core ... transforming strings to typed values · 20 9class: class hierarchies and exception handling · 43; maintaining library source · 23 5; Standard C+ + string · 1 82; wrapping · 17 6cleaning up the stack during ... <ctime>#include <cassert>#include <iomanip>using namespace std; namespace { const int daysInMonth[] [13 ] = { {0, 31 ,28 , 31, 30, 31, 30, 31, 31, 30, 31, 30, 31} , {0, 31 ,29 , 31, 30, 31, 30, 31, 31, 30, 31, 30, 31} };...