For those of you who are wondering how the 1st while loop will terminate , it will terminate only if you type 'false' or 'eof' . It is a fancy way of solving this question but it is not optimised way because it takes a hell lot of machine cycles and instructions . take a look

while (cin >> A[i++] && (i < N)); 00B324BD mov eax,dword ptr [i]
00B324C0 mov ecx,dword ptr [A]
00B324C3 lea edx,[ecx+eax*4]
00B324C6 mov dword ptr [ebp-11Ch],edx
00B324CC mov eax,dword ptr [i]
00B324CF add eax,1
00B324D2 mov dword ptr [i],eax
00B324D5 mov esi,esp
00B324D7 mov ecx,dword ptr [ebp-11Ch]
00B324DD push ecx
00B324DE mov ecx,dword ptr [imp?cin@std@@3V?char_traits@D@std@@@1@A (0B3D098h)]
00B324E4 call dword ptr [__imp_std::basic_istream >::operator>> (0B3D09Ch)]
00B324EA cmp esi,esp
00B324EC call __RTC_CheckEsp (0B312DFh)
00B324F1 mov dword ptr [ebp-0FCh],eax
00B324F7 mov edx,dword ptr [ebp-0FCh]
00B324FD mov eax,dword ptr [edx]
00B324FF mov ecx,dword ptr [ebp-0FCh]
00B32505 add ecx,dword ptr [eax+4]
00B32508 mov esi,esp
00B3250A call dword ptr [__imp_std::ios_base::operator bool (0B3D0D0h)]
00B32510 cmp esi,esp
00B32512 call __RTC_CheckEsp (0B312DFh)
00B32517 movzx ecx,al
00B3251A test ecx,ecx
00B3251C je main+0E8h (0B32528h)
00B3251E mov eax,dword ptr [i]
00B32521 cmp eax,dword ptr [N]
00B32524 jge main+0E8h (0B32528h)
00B32526 jmp main+7Dh (0B324BDh)
while (cout << A[--N] << ' ' && N); 00B32528 mov eax,dword ptr [N]
00B3252B sub eax,1
00B3252E mov dword ptr [N],eax
00B32531 push 20h
00B32533 mov esi,esp
00B32535 mov ecx,dword ptr [N]
00B32538 mov edx,dword ptr [A]
00B3253B mov eax,dword ptr [edx+ecx*4]
00B3253E push eax
00B3253F mov ecx,dword ptr [imp?cout@std@@3V?char_traits@D@std@@@1@A (0B3D0D4h)]
00B32545 call dword ptr [__imp_std::basic_ostream >::operator<< (0B3D0A4h)]
00B3254B cmp esi,esp
00B3254D call __RTC_CheckEsp (0B312DFh)
00B32552 push eax
00B32553 call std::operator<< > (0B314A6h)
00B32558 add esp,8
while (cout << A[--N] << ' ' && N); 00B3255B mov dword ptr [ebp-108h],eax
00B32561 mov ecx,dword ptr [ebp-108h]
00B32567 mov edx,dword ptr [ecx]
00B32569 mov ecx,dword ptr [ebp-108h]
00B3256F add ecx,dword ptr [edx+4]
00B32572 mov esi,esp
00B32574 call dword ptr [__imp_std::ios_base::operator bool (0B3D0D0h)]
00B3257A cmp esi,esp
00B3257C call __RTC_CheckEsp (0B312DFh)
00B32581 movzx eax,al
00B32584 test eax,eax
00B32586 je main+150h (0B32590h)
00B32588 cmp dword ptr [N],0
00B3258C je main+150h (0B32590h)
00B3258E jmp main+0E8h (0B32528h)