Re: In a timeline pinch (Suspense: 25Jul05) pleading for assistance - Q1

> I would greatly appreciate your assistance. Granted, it isn't the proper
> approach, but the time
> remaining demands urgent solutions.

I agree, 3 weeks is really urgent for a 25 question multiple choice
homework assignment.

> 1. Which of the following usually indicates that there is no more input to
> be read by a program?
>
> a. '\n'
> b. '\0'
> c. END
> d. EOF

Depends

> 2. What is the effect of the following code?
> char Ch;
> Ch = '7';
> printf("%d\n", Ch);
>
> a. It will cause an error
> b. It will print out the computer's internal code for the character '7'
> c. It will print out the character '7'
> d. It will print out the character whose internal code is 7

It will print out the contents of the value bits of Ch as a decimal
number to the stdout file stream.

> 3. What is the effect of the following code?
> char Ch;
> while ((Ch=getchar() ) != ';')
> putchar (Ch);
>
> a. It will read and write characters until something other than a ; is read.
> b. It will read characters up to and including the first semicolon, and
> write characters up to but not including the first semicolon.
> c. It will read and write characters up to but not including the first
> semicolon.
> d. It will skip characters up to the first semicolon, then write the next
> character.

None of the answers handle EOF

> 4. It is necessary to use an int instead of a char for processing a
> character:
>
> a. whenever a computation is performed on the character.
> b. whenever a test for EOF is made.
> c. whenever the character is passed as a parameter to a function.
> d. It is never necessary to use an int for character processing.

In the contexts where it is correct to treat a char as int

> 5. What characters are output by the following code:
>
> char Ch='/';
> while (Ch != 'd')
> {
> putchar(Ch);
> Ch = getchar();
> }
>
> given the following input? abcdefghi
>
> a. abc
> b. d
> c. /abc
> d. /efghi

Doesn't handle EOF

> 6. What is the effect of the following code?
>
> char Ch;
> while ((Ch = getchar()) != '\n')
> putchar(' ');
>
> a. It reads and writes exactly one line with a blank after each character.
> b. It reads one line but outputs only blanks.
> c. It reads a line and then outputs one blank.
> d. It reads and writes one line with all blanks replaced by newlines.

Doesn't handle EOF

> 7. In general, when an int is combined with a long in an expression, the
> result is:
>
> a. int
> b. long
> c. double
> d. A syntax error

It depends on the expression and what you mean by combined. If you mean
the usual arithmetic conversions, the answer is B.

> 8. Given the following declarations:
>
> int N;
> char C;
> float X;
>
> what is the type of the expression C+N*X?
>
> a. char
> b. int
> c. float
> d. The expression contains a syntax error

C, why?

> 9. Given the following declarations and initialization:
>
> int i = 1;
> int x = 2.0;
>
> What is the value and type of the expression i/x?
>
> a. .5 double
> b. .5 int
> c. 0.0 float
> d. 0 int

D, why?

> 10. Given the following declarations and initializations:
>
> int n = 8;
> int z = 2.0;
>
> What is the value and type of the expression z=n?
>
> a. 8 int
> b. 8 float
> c. 8 double
> d. 8 unsigned

A, why?

> 11. Which of the following statements is true?
> a. int expressions are always computed exactly; but float expressions can
> suffer round-off error
> b. float expressions are always computed exactly; but int expressions can
> suffer round-off error
> c. Both int and float expressions can suffer round-off error
> d. Both int and float expressions will always be computed exactly

Depends if you consider overflow as computed correctly or undefined
behavior as round-off error.

> 12. Given the following declarations:
>
> int N;
> float X;
>
> what is the type of the expression X%N?
>
> a. int
> b. float
> c. double
> d. can't use float with %

This is trival to check with a compiler

> 13. Choose the C statement which defines an enumeration type fuzzy
> consisting of values false, maybe, and true. Defined so that maybe is
> greater in value than false but less than true.
>
> a. enum fuzzy {false, maybe, true};
> b. enum fuzzy {true, false, maybe};
> c. enum fuzzy {false, maybe, true}
> d. enum fuzzy {true, maybe, false};

Did you even attend class?

> 14. Given the type definition below:
>
> enum color {red, yellow, green, blue};
>
> what is the value of the expression (int) blue?
>
> a. 2
> b. 3
> c. 4
> d. blue

Both B and D are correct.

> 15. Which of the following statements allocates space for a variable of the
> defined enum type?
>
> a. enum color {red, yellow, blue} paint;
> b. enum color {red, yellow, blue};
> c. enum {red, yellow, blue} paint;
> d. a and c

D, why?

> Answer questions 16 and 17 given the following values for the int variables
> X and Y
>
> X=1100110000110011
> Y=0000111100001010

I'm assuming this is the value representation in binary where the sign
bit is the MSB.

> 16. What is the binary representation of X<<5?
>
> a. 1000011001100000
> b. 1000011001111111
> c. 0000110011000000
> d. 0000110011111111

undefined

> 17. What is the two's complement of -Y (negative Y)?
>
> a. 0000111100001010
> b. 1111000011110101
> c. 1111000011110110
> d. 1100000000110001

How are signed integers stored and how do you want to define the
operation "taking the two's complement of -Y"?

> 18. If X is an int variable, what do we know about the value of X&X?
>
> a. It is always equal to X.
> b. It is always greater than 1.
> c. It is always equal to zero.
> d. It is always equal to 1.

A, why?

> 19. A pointer variable contains:
>
> a. an integer.
> b. the address of another variable.
> c. any data type.
> d. a character string.

I don't see an answer that takes into account: the null pointer value,
if the pointer is uninitialized, doesn't point to valid memory, a
pointer of an intermedite cast, etc.

> 20. The term "dereferencing" means:
>
> a. taking the address of another variable.
> b. deleting a variable.
> c. retrieving the value of a variable given its address.
> d. making an assignment to a pointer variable.

C

> 21. Which of the statements below is true of the following declaration:
>
> int n=5, *p=&n;
>
> a. p is a pointer initialized to point to n.
> b. p is a pointer initialized to the value 5.
> c. n and p are both pointer variables.
> d. The declaration contains a syntax error

A, why?

> 22. Call-by-reference is:
>
> a. not available in C.
> b. accomplished by declaring a formal parameter to be a pointer.
> c. accomplished be using a de-referenced pointer as a parameter.
> d. accomplished by putting an ampersand (&) in the formal parameter.

Neither the C++ nor C standards define this term so it can mean
anything you want it to mean. Any thing but answer C (which is complete
nonsense) can be considered correct.

> 23. If you want a variable declared inside a function to retain its previous
> value when the block is re-entered, what type of storage class should you
> use?
>
> a. auto
> b. static
> c. register
> d. extern

B, why?

> 24. The address operator & cannot be applied to which of the following?
>
> a. constants
> b. expressions
> c. variables of class register
> d. All of the above

Depends on the person with the answer ***. C is correct but they'll
probably say D.

> 25. Write the output produced by the following code:
>
> int x=5, y=6, *p=&x, *q=&y;
> x=*q;
> *p = *q + 2;
> *q=x;
> printf("%d %d %d %d\n", x, y, *p, *q);
>
> a. 8 8 8 8
> b. 5 6 5 6
> c. 6 8 5 6
> d. 6 8 6 8

Do I look like a compiler to you?

.