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Any name that is not a reserved word can be a legal variable, function or type name. All names must be alphanumeric, but they cannot begin with a digit. The C++ standard recommends that all user-defined names be written entirely in lower case with underscores for spaces. Some programmers prefer 'camel case' (such as PrintObject and MaxNumber), which was a popular convention amongst the Pascal programming community, however print_object and max_number are the C++ conventions. Names in all caps are typically reserved for macro definitions (which is effectively a separate language from C++ itself), while names with leading underscores should generally be avoided as this convention is utilised extensively within the standard library.
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MaxineA variable declaration is where you declare a data type, the name of the data type (so you can refer to it) and an optional initial value for the data type. E.g., the following declares a variable of type int, names it answer, and initialises it with the value 42:
int answer = 42;
The end result is that some memory is allocated to store the int, and that memory is initialised with the value 42. There is no need to know the address of the memory since you can refer to it by the name, answer. But if you should ever need the actual address, the address-of operator will reveal it: &answer.
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In c plus plus are local declarations visible to the function in a program?
If you declare a variable inside of any fuction (except main) it will not be available to other functions.
Why you need to declare variable 1st in turbo c plus plus?
In C++ all names (including variables) must be declared before they can be used.
What are the rules of defining variable?
All variable names must begin with a letter of the alphabet or an underscore ( _ ). The rest of the characters may be any of those previously mentioned plus the digits 0-9.
What are 4 valid variable types in C plus plus?
long, short, char and bool are 4 valid variable types. There are many more available, including (but not limited to) float, double, int, wchar_t, size_t, as well as compound types (such as long long) and unsigned/signed variations, such as unsigned int. All of these types are primitive, integral or built-in data types. More complex data types can be formed from struct, class and union declarations, but they all simply build upon the integral types.
Explain the scope and visibility of variables in c plus plus function?
If you define a variable inside of your function, the variable can be referred and used only inside of that function. It means that you will not able to use the variable in another function (including main). Area of code where your variable can be used after declaration is usually called visibility of the variable.
