$1.$ A constant variable does not have an l$-$value $($address$).$ True or false?

$2.$ The r$-$value $($content$)$ of a pointer variable must be a memory address. True or false?

$3.$ An int variable cannot be de$-$referenced. True or false?

$4.$ A static variable in a function will remain its value after the function is returned. True or false?

$5.$ An operator is essentially the same as a function. True or false?

$6.$ In general, call$-$by$-$reference takes less time and memory than call$-$by$-$value. True or false?

$7.$ When calling a function, the name of a real argument must be different than the name of the corresponding formal parameter? True or false?

$8.$ All C$++$ code for a program must be in a single $.$cpp file. True or false?

$9.$ A C$-$string is essentially an array of chars. True or false?

$10.$ If you declare a C$-$string variable without initialization, its content is empty. True or false

$11.$ Memory allocated by new operator will be released when execution is out of the block where new is used. True or false?

$12.$ A friend function of a class cannot be a member function of that class. True or false?

$13.$ Even if a function is a friend of a class, it cannot access the class$$s private members.

True or false?

$14.$ Every object of a class has its own instance of a static data member of this class. True or false?

$15.$ A data member can be changed by a const member function. True or false?

$16.$ A class data member may be of a type which is another user$-$defined class. True or false?

$17.$ All member functions of a class must be defined with its declaration. True or false?

$18.$ A class data member must be private. True or false?

$19.$ A class can have only one constructor. True or false?

$20.$ Within a class definition, a member function cannot directly call another member function unless the latter is public. True or false?