on Expressions

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1. Which one of the following is NOT a correct arithmetic expression?

a. alpha
b. (alpha / momentum) - 12.4
c. alpha ( / momentum - 12.4 )
d. ((alpha / momentum) - 12.4)

2. What is an operand?

a. Another name for number.
b. Another name for integer.
c. One of the arithmetic symbols like *, +, -, and /.
d. A value that is acted upon by an operator.

3. Assume the following declarations: 

short  a=12 ;
int    b=33 ;

float  x = 2.3;
double y = 3.14;

Which one of the following expressions will NOT be evaluated using double precision floating point?

a. a + x
b. 1.5 + 8.6
c. a + b
d. x / y

4. What does the following program output? 

class question4
{
  public static void main ( String[] args )
  {
    int totalCost = 6;    
    int items     = 12;
    System.out.println("cost per item: " + totalCost/items );
  }
}
a. cost per item: .5
b. cost per item: 0
c. cost per item: 1
d. cost per item: +6/12

5. What is the result of evaluating the following expression? 

( 1/2 + 3.5) * 2.0
a. 8.0
b. 8
c. 7.0
d. 0

6. What is the result of evaluating the following expression? 

-32 / 6
a. -2
b. -5
c. -5.3333
d. +6

7. What is an expression?

a. The same thing as a statement.
b. An expression is a list of statements that make up a program
c. An expression is a combination of literals, operators, variables, and parentheses used to calculate a value.
d. An expression is a number expressed in digits.

8. Given the following expression: 

(a - x)/(13 - z)

Which of the following is NOT a subexpression?

a. (a - x)
b. (13 - z)
c. a - x
d. x ) / (13

9. What is the value of 

-32 % 6
a. 5
b. -5
c. 2
d. -2

10. Which of the following declarations works for the constant pi (assume that the numerical value is correct)?

a. final pi = 3.14159265358979 ;
b. final double pi = 3.14159265358979 ;
c. constant double pi = 3.14159265358979 ;
d. double pi = 3.14159265358979 ;

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