Computer Science class Quiz multiplechoice c++

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1. A logical OR  false if:

Only one input is true

There is no such thing as an AND gate

Neither input is true

Both inputs are true

2. A bitwise XOR  is true if

Only one input is true

There is no such thing as an OR gate

Both inputs are true

Either input is true

3. The ! operator is true

If the input is true

A NOT gate does not exist

If there is no input

If the input is false

4. Which of the following is not a C++ looping structure

DO-UNTIL

DO-WHILE

While

For

5. In a for statement, there are two semi-colons. In which area of a for loop does the initialization of the control variable occur?

Between the first semicolon and the second semicolon

The for loop does not do any tests

After the second semicolon

Before the first semicolon

6. if(x == 2 |- y == 3)

{

//Do Something

}

The |- stands for

AND

XOR

OR

No valid answer for this question!

7. Which of the following statements will cause a switch statement or a loop to terminate immediately?

break

halt

stop

continue

8. In order to stop one case in a switch to fall through to the next case, you would use the ________________ statement

default

break

continue

next case

9. The default statement is used in a switch in order to provide

a case for anything that does not match any other case

a case that might be executed if the single case above it is not executed.

There is no such statement in C++!

a case that is always executed

10. Given that a bit pattern stored in the variable x is 00000101, what will x <<= 1 do to this bit pattern?

It would make it 00001010

Nothing. This does not exist in C++!!

It would make it 00000010

It would make it 00000001

11. The continue statement causes a loop to

This is not a C++ statement!

immediately go to the next iteration after completing the remaining steps in the loop

immediately go to the next iteration without completing the remaining steps in the loop

immediately terminate

12. Which of the following escape characters will cause the a backspace character to be printed to the screen?

\n

\b

\r

\t

13. Which of the following is not a C++ data type?

All are

float

double

char

bool

integer

14. Which of the follow will always execute the body of the loop at least once, regardless of the condition.

a while loop

a do-while loop

a switch statement

a for loop

15. In a for statement, there are two semi-colons. In which area of a for loop does the testing occur?

The for loop does not do any tests

Between the first semicolon and the second semicolon

Before the first semicolon

After the second semicolon

16. Boolean expressions are evaluated similarily to the way arithmetic expressions are evaluated

True

False

17. A switch statement is not a good way to implement a menu for the user of your program

True

False

18. Indentation of code is required by the compiler in C++, and servers no useful purpose for the programmer.

True

False

19.

Which of the following is not a C++ data type?

int

double

bool

whole

char

float

20. Variables contained within a block, ie, starting with a { and ending with a } are global variables.

True

False

21. If an identifier is declared as a variable in each of two blocks, one within the other, then these are two different variables with the same name. One variable exists only within the inner block and cannot be accessed outside of the inner block. The other variable exists only in the outer block and cannot be accessed in the inner block. The two variables are distinct, so changes made to one of these variables will have no effect on the other of these two variables.

True

False

22. A block is some C++ code enclosed in braces. The variables declared in a block are local to the block and so the variable names can be used outside of the block for something else.

True

False

23. Which of the following has the highest precedence?

* (Multiply)

&&

==

Unary minus

24. The // is used for _______________

marking the start of a multi-line comment

dividing doubles

making a single line comment, or commenting at the end of a line

This is not part of C++!!!

25. Which of the follow will always execute the body of the loop at least once, regardless of the condition.

a for loop

a switch statement

a do-while loop

a while loop

26. By default, cin uses whitespace as the data separator.

True

False

27. The iomanip setfill() needs to be "turned off." Meaning, it is set only for the output statement you are currently within.

True

False

28. In order to use setfill(), or any of the other items, you must include <iomanip> and be using cout only.

True

False

29. A byte is 16 bits.

True

False

30. In order to shift the value in an integer variaible x one bit to the left, you would use x <<= 1;

True

False

31. C++ automatically initialized variables to ______________

1

-1

Junk values

0

32. Which of the following iomanip functions does not need to be "turned off" if you use it?

setfill

oct

setprecision

setw

33. A short int has 32 bits on a 32 bit machine.

True

False

34. The data range of a  int and an unsigned int are the same.

True

False

35. Masking operations work only on integer and integer-like variables

True

False

36. while( i = 0)

   cout<<"Hello"<<endl;

Will iterate indefinitely.

True

False

37. Assignments can be done within a while, if, or do-while condition.

True

False

38. Assuming that x and y are ints,

x ^= y;

y ^= x;

x ^= y;

will __________________

cause a random value to appear in x and y

do nothing. Will not compile!

Swap the values of the variables x and y

will make x and y the same value

39. A for statement requires all three parts, separated by semi-colons, to have a statement within them.

True

False

40. The comma operator allows you to put multiple statement on one line ending with a semi-colon.

True

False

 

41. in order to use cin, you must include fstream

True

False

42. The number of digits in an integer is one less than the log base 10 of the number.

True

False

43. In standard C++, you can use either && or and for a logical AND in an if statement

True

False

44. In standard C++, you can use an || or an or in an if statement condition.

True

False

45. The sign bit of an integer is bit number 0 in C++.

True

False

46. When converting from double to integer, it is not possible to lose information.

True

False

47. The log10 function works only on doubles or floats.

True

False

48. A while statement cannot be nested within an if statement

True

False

49. The else statement is required on all if statements;

True

False

50. for(int i = 0; i < 100000; i++);

is a valid C++ statement

True

False