C# Unit 4

What is the output of the following code segment?

int a = 3, b = 4;
if (a == b)
    Write("X");
    WriteLine("Y");

A. X
B. XY
C. Y
D. nothing

What is the output of the following code segment?

int a = 3, b = 4;
if (a < b)
{
   Write("Y");
   WriteLine("Z");
}

A. nothing
B. Z
C. YZ
D. Y

What is the output of the following code segment?

int a = 3, b = 4;
if (a > b)
   Write("Up");
else
    WriteLine("Down");

A. Down
B. nothing
C. UpDown
D. Up

If the following code segment compiles correctly, what do you know about the variable x?

if(x) WriteLine("OK");

A. x is an integer variable
B. x is greater than 0
C. none of these
D. x is a Boolean variable

What is the output of the following code segment?

int c = 6, d = 12;
if(c > d);
   Write("Green");
   WriteLine("Yellow");

A. Yellow
B. GreenYellow
C. Green
D. nothing

What is the output of the following code segment?

int c = 6, d =12;
if(c > d)
    if(c > 8)
       Write("Blue");
    else
       Write("Red");
else
   Write("Green");

A. Blue
B. Green
C. nothing
D. Red

What is the output of the following code segment?

int e = 5, f = 10;
if (e < f && f < 0)
   Write("Red");
else
   Write("Orange");

A. nothing
B. RedOrange
C. Red
D. Orange

What is the output of the following code segment?

int e = 5, f = 10;
if (e < f || f < 0)
    Write("Purple");
else
   Write("Gold");

A. PurpleGold
B. Purple
C. Gold
D. nothing

Which of the following expressions is equivalent to the following code segment?

if (g > h)
    if (g < k)
        Write("Brown");

A. if (g > h && g < k)
      Write("Brown");
B. if (g > h && < k)
       Write("Brown");
C. if (g > h || g < k)
        Write("Brown");
D. two of these

Which of the following expressions assigns true to a Boolean variable named isIDValid when idNumber is both greater than 1000 and less than or equal to 9999, or else is equal to 123456?

A. two of these
B. isIDValid = ((idNumber > 1000 && idNumber <= 9999) || idNumber == 123456)
C. isIDValid = (idNumber > 1000 && idNumber <= 9999 && idNumber == 123456)
D. isIDValid = (idNumber > 1000 && idNumber <= 9999 || idNumber == 123456)

Which of the following expressions is equivalent to a || b && c || d?

A. two of these
B. a && b || c && d
C. a || (b && c) || d
D. (a || b) && (c || d)

How many case labels would a switch statement require to be equivalent to the following if statement?

if(v == 1)
  WriteLine("one");
else
  WriteLine("two");

A. zero
B. one
C. impossible to tell
D. two

In C#, falling through a switch case is most often prevented by using the ______ statement.

A. default
B. case
C. end
D. break

If the test expression in a switch does not match any of the case values, and there is no default value, then ________.

A. a runtime error occurs
B. the expression is incremented and the case values are tested again
C. the program continues with the next executable statement
D.   a compiler error occurs

Which of the following is equivalent to the following statement?

if(m == 0)
   d = 0;
else
   d = 1;

A. d = (m == 0) : d = 0, d = 1;
B. m == 0; d = 0; d = 1?
C. m ? (d = 0); (d = 1);
D. d = (m == 0) ? 0 : 1;

Which of the following C# expressions is equivalent to a < b && b < c?

A. a < b && c >= b
B. two of these
C. !(b <= a) && b < c
D. c > b > a

Which of the following C# expressions means, "If itemNumber is not 8 or 9, add TAX to price"?
A. if (itemNumber != 8 || itemNumber != 9)
   
    price = price + TAX;
B. if (itemNumber != 8 && itemNumber != 9)

    price = price + TAX;
C. if (itemNumber != 8 && != 9)

    price = price + TAX;
D. two of these

Which of the following C# expressions means, "If itemNumber is 1 or 2 and quantity is 12 or more, add TAX to price"?

A. if (itemNumber = 1 || itemNumber = 2 && quantity >= 12)

    price = price + TAX;
B. if (itemNumber == 1 || itemNumber == 2 || quantity >= 12)

    price = price + TAX;
C. if (itemNumber == 1 && itemNumber == 2 && quantity >=12)

    price = price + TAX;
D. none of these

Which of the following C# expressions means, "If itemNumber is 5 and zone is 1 or 3, add TAX to price"?

A. if (itemNumber == 5 && zone == 1 || zone == 3)
    
    price = price + TAX;
B. if (itemNumber == 5 && (zone == 1 || zone == 3))

    price = price + TAX;
C. if (itemNumber == 5 && (zone ==1 || 3))
 
    price = price + TAX;
D. two of these

Which of the following C# expressions results in TAX being added to price if the integer itemNumber is not 100?

A. if (itemNumber != 100) 

    price = price + TAX;
B. if (!(itemNumber == 100))

    price = price + TAX;
C. if (itemNumber <100 || itemNumber > 100)

    price = price + TAX;
D. all of these