c++ Question 5 Whenever they are passed as parameters to a function, the IO clas

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c++

Question 5

Whenever they are passed as parameters to a function, the IO classes istream and ostream must be passed using a pass-by-reference parameter passing scheme.

Select one:

a. FALSE

b. TRUE

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When no class constructors are supplied by the author of a class, that class will generated errors when compiled in C++.

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a. TRUE

b. FALSE

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The body of a do { ... } while(...); loop will always executes atleast once, no matter what test condition is stated.

Select one:

a. TRUE

b. FALSE

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The body of a while(...) { ... } loop will always executes atleast once, no matter what test condition is stated.

Select one:

a. TRUE

b. FALSE

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A throw(...) statement is an alternative way to return from a function or method that indicates some kind of failure occurred.

Select one:

a. TRUE

b. FALSE

Information

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Please consider the following code fragment when answering the next few questions:

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The variable named var1 declared above is an object and therefore has callable methods driver code can call.

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a. FALSE

b. TRUE

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The variable named var2 declared above will include an ending NULL character.

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True

False

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The variable named var3 declared above is not an object and therefore has no methods driver code can call.

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a. FALSE

b. TRUE

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The variable named var4 declared above is not an object and therefore has no methods driver code can call.

Select one:

a. TRUE

b. FALSE

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Run-time parameters passed to a function allow you to use different values each time the function is called.

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True

False

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When a function changes the value of reference parameter, the value of the actual parameter will get changed as well.

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True

False

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In C++, a class is allowed to have more than one constructor.

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True

False

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When authoring a virtual function, the keyword virtual only appears in the .h file, NOT the .cpp file.

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True

False

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When a class method is marked with the keyword friend in a .h file,

Select one:

a. it will be a compile error if C++ programmers mark that class method with the keyword friend in the class' .cpp file.

b. it will be a run-time error if C++ programmers mark that class method with the keyword friend in the the class' .cpp file.

c. it will be required for C++ programmers to mark that class method with the keyword friend in the class' .cpp file.

d. it will be a link error if C++ programmers mark that class method with the keyword friend in the class' .cpp file.

e. None of the choices here are correct.

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The default case is required in the switch selection statement.

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True

False

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When a class method is marked with the keyword const in a .h file,

Select one:

a. it will be a run-time error if C++ programmers mark that class method with the keyword const in the class' .cpp file.

b. None of the choices here are correct.

c. it will be a compile error if C++ programmers mark that class method with the keyword const in the class' .cpp file.

d. it will be required for C++ programmers to mark that class method with the keyword const in the class' .cpp file.

e. it will be a link error if C++ programmers mark that class method with the keyword const in the class' .cpp file.

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In addition to redefining existing operators, C++ allows programmers to create their own new operators.

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True

False

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If operator+ is supported by a class, how many parameters should it be defined to accept?

Select one:

a. 1 or 2

b. 2

c. 3

d. 1

e. None

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In an infinite while loop, the expression controlling the loop will initially evaluate to false, but after the first iteration it will always evaluate to true.

Select one:

True

False

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If operator >> is supported by a class, how many parameters should it be defined to accept?

Select one:

a. 1

b. 3

c. 1 or 2

d. 2

e. None

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All of the following are reserved keywords in C++ EXCEPT

Select one:

a. this

b. friend

c. class

d. for

e. tryorfail

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Which of the following declarations for a function is valid and legal in C++?

Select one:

a. void foo

b. All of the choices listed are valid C++ function declarations

c. int foo( char x );

d. None of the choices listed is a valid C++ function declaration

e. foo( int a, int b );

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In C++, arrays can be passed as parameters to a function either by value or by reference.

Select one:

True

False

char[] var1 = “Hello”; // a c-string variable char * var2 = new char( 20 );
strcpy( var2, “Hello” ); // a c-string variable char var3[ 5 ] = { ‘H’, ‘e’, ‘l’, ‘l’, ‘o’ }; // an array std::string var4( “Hello” ); // a string variable

Explanation / Answer

5) false
for pass by parameter no need to pass IO classes and ostream....for pass by referrence
we wil pass

6) TRUE
without constructor object cannot be instantiaited.

7 & 8) TRUE
first it pass through do and then executes once and lastly it checks condition.
syntax do
{
   /* code */ //execiutes minimum once
} while (/* condition */);

9)TRUE
When we write set of expressions to do in try block...if we write catch it will catch exception...using throw

10)TRUE
it is avaiable as globally scope and for object we can call driver methods.

11) TRUE
it stores as 'H' 'E' 'L' 'L' 'O' ' '

12) TRUE
Yes it is array so no callable methods....only object can call

13) FALSE
It is variable and can still call methods.

14) TRUE
for pass by parametrs we can use many variables for pass by reference we can't

15) TRUE
as it shares address.. it will directly change original value

16) TRUE
parameterised and default constructor

17) FALSE
in cpp also we can use

18) c. it will be required for C++ programmers to mark that class method with the keyword friend in the class' .cpp file.

19) FALSE
not necessary

20) d. it will be required for C++ programmers to mark that class method with the keyword const in the class' .cpp file.

21) TRUE

22) d. 1
   One parameter is enough..increment operator

23) FALSE
infinite loop means it will execute always.

24) c. 1 or 2

25) e. tryorfail
this keyword not there in c++

26) b. all are valid

27) TRUE

passbyvalue(array);
passByReferrence(&array);

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