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هلا والله اخوي macnux ويعطيك العافية

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1- The natural numbers are an example of a set.

True

False

2 - Consider the function f(x) = 1 / (x - 5). Which of the following is a true statement? Note that the term domain refers to the set of values for which a function f is defined, and the term range identifies the set of all values of the function f as its argument varies over the domain.

The domain is all real numbers except 5; the range is all real numbers except 0.

The domain is all real numbers except 0; the range is all real numbers except 5.

The domain is all real numbers; the range is all real numbers.

None of the above is true.

3- There are 25 students.

• 12 students are taking an English class.
  
• 11 students are taking a history class.
  
• 4 students are taking neither an English nor a history class.
  

How many students are taking both an English and a history class?

21

11

2

None of the above

4- Assume that x, y, and z have some numerical values. What does the following Java expression evaluate to?

(x <= y) && ((z != z) || (x > y))

True

False

Impossible to tell

5- "Only if Jim is at least 13 years old and Sue is not dating anyone else, then Jim and Sue can go out together." Which of the following statements is saying the same thing as the quote listed above?

If either Jim is younger than 13 or Sue is dating someone else, then Jim and

Sue can NOT go out together.

If Jim is at least 13 years old, then Jim and Sue can go out together.

If it is NOT the case that "Either Jim is younger than 13 and/or Sue is dating someone else", then Jim and Sue can NOT go out together.

All of the above are the same.

6- Which of the following is likely to be implemented directly in a programming language?int

float

char

All of the above

None of the above

7- Time to access the i^th element of an array is:Linear with respect to the number of elements in the array.

Independent of the number of elements in the array.

A single machine instruction.

Logarithmic with respect to the number of elements in the array.

8- What information can one get from the array declaration listed above?Array name

Type of the elements in the array

Array size

The range of values that an index accessing this array can have

All of the above

9- What would be printed from the following Java code? Note that Java uses 0-based indexing which means the index of the first element in an array is 0. String str = "Programming"; int i = 1; for (int j=0; j<3; j++) { System.out.println(str.charAt(i)); i = i + 2; }

Por

rga

Prog

Porm

10 - Consider an array "A" that stores 100 integers. The array A looks like this:

A = (3, 2, 1, 4,...8, 6, 5) where A[0] equals 3, A[1] equals 2, and so on up to A[99] equals 5. The assignment A[0] = 4 would replace the 3 with a 4.

What would result from executing the Java code listed below? i = 99; while (i > 0){ A = A[i - 1]; A[i - 1] = A[i - 1] - 1; i = i - 1; }

A = (2, 3, 2, 1, 4,...8, 6)

A = (2, 3, 2, 1, 5,...8, 6)

A = (3, 2, 2, 1, 4,...6, 5)

A = (3, 2, 1, 4, 5,...8, 6)

11 - Which of the following types of statements do NOT affect the purely sequential order of execution (control flow) in a program?

Conditional

Repetition

Assignment

All of the above

12- -b (c + 34) / 2a

Assuming typical math precedence, which of the following C expressions is equivalent to the expression shown above?-b * (c + 34)/(2 * a)

-b * (c + 34)/2 * a

-b * c + 34/2 * a

-b*c - 34 * b / (2 * a)

13 - Here are two psuedocode if-then statements: If (a < 'b) then x = y If (a >= "b) then x = z Which of the following Java if-else statement correctly expresses the above two if-then statements? a. if (b >= a) x = y; else x = z; b. if (a < "b) x = z; else x = y; c. if(a > "b) x = z; else x = y; d. if(a >= "b) x = z; else x = y; a.

b.

c.

d.

14 - Assume that Sunday is represented by 1, Monday by 2, etc. Then the sequence of days for a month of 30 days that begins on Tuesday is: 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 Which of the following Java code samples will correctly print the days (as above) for the entire month of 30 days, assuming that the month begins on Tuesday? Hint: k % m is the remainder of k being divided by m.

a. int day = 3; for(int i=0; i<30; i++){ System.out.print(day); day = (day%7)+1; }

b. int day = 3; for(int i=0; i<30; i++){ System.out.print(day); day = day%(7+1); }

c. int day = 3; for(int i=0; i<30; i++){ System.out.print(day); day = day%7; }

d. int day = 3; for(int i=0; i<30; i++){ System.out.print(day); day = (day + 1) % (7+1); }

a.

b.

c.

d.

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