What is the fullmeaning of ...'int' ??

Answer 1

int = integer stores whole numbers

Answer 2

integer

Answer 3

Integer, a built-in type, represents a whole number value. Define integer using the keyword int.
C++ requires that you specify the type and the identifier for each variable defined.
An identifier is a name for a variable, function, class, module, or any other user-defined item. An identifier starts with a letter (A-Z or a-z) or an underscore (_), followed by additional letters, underscores, and digits (0 to 9).

Answer 4

By your tags, I assume you're confused by the int in "int main()". That species that it returns an integer. Hence the "return 0;" at the end. If you return a nonzero value, it tells the operating system/the program that started it, that it had errors. So for example, if you attempt to open a file, but you can't, you would rite "return 1;"

Answer 5

The bit size depends on language.
In C# it’s 32 bit.
In C++ its 16 bits if i remember right.