It means you hold down the <Alt> key, press <C>, and then release them both. Interpretation of this action is dependent on the particular application. Look at the menu bar. If there is a word with a C that is underlined, then <Alt><C> will invoke that item. Otherwise, consult the documentation for keyboard shortcuts. For example, Mozilla Firefox defines <Alt><F><C> as the command to close a tab.
It depends on the program. In MSVC++, ALT+C would open the Architecture menu.
ALT+0174
C: there are no methods in C. C++: no.
c is procedure oriented and c++ is object oriented & much newer.
If a + b + c + d + 80 + 90 = 100, then a + b + c + d = -70.
C++ is related to C, the language from which it is derived.
Going full screen is not a C or C++ feature; it is an operating system feature. If you are running under MS Windows, you can go full screen in a console application by using <Alt><Enter>. Use <Alt><Enter> again to go back to windowed mode. You can also preset this in the shortcut.
ALT+0174
alt 1
it is not control alt down it it control alt delete
They are called accelerators. They are shortcut keystrokes that bypass the command menu system and call the associated command directly.
It starts the Save As command.
Brad Graziadio created ALT+TAB. He is also my father.
Ctrl+r
Reboot
Alt+F9
flips the screen
alt C + F12 alt C + F12