Practice exam 1

1. (10 points) Choose the best answer to each of the following:

   (1)	_____	In Java, + is
   		A relational operator A unary operator A mathematical operator All of the above None of the above
   (2)	_____	In Java, -1 the - is
   		A unary operator A binary operator Has boolean operands All of the above None of the above
   (3)	_____	In Java, a variable is
   		The implicit loss of precision in arithemtic operations The way the decrement operator changes A named space for holding a value All of the above None of the above
   (4)	_____	In Java, the statement doubl cost;
   		Will cause a compile-time error Will cause a run-time error Will cause a repetitive stress error All of the above None of the above
   (5)	_____	In the Java statement i = (int)d; the operator = is a/an:
   		Assignment operator Relational operator Typecast operator All of the above None of the above
   (6)	_____	In the Java statement i = (int)d; the (int) operator is a/an:
   		Assignment operator Relational operator Typecast operator All of the above None of the above
   (7)	_____	In the Java statement i = (int)4.0; the operand of the (int) operator is a/an:
   		Assignment operator Literal Typecast operator All of the above None of the above
   (8)	_____	In Java, what kind of statement is int i;?
   		Assignment statement Declaration statement Typecast statement All of the above None of the above
   (9)	_____	In Java, an assignment statement must contain which of the following?
   		Curly brackets Parentheses An equal sign All of the above None of the above
   (10)	_____	In Java, the main() method of the "main class" must have what return type?
   		double int String void None of the above

1. (10 points) Evaluate each of the following expressions (which are written in Java) assuming that multiplication has higher precednce than addition and that all operators use left-to-right associativity. If the expression contains a syntax error, write the word "Error".

   3 * 4 * 2

   3 * 4 +

   2 + 3 + 4 * 5

   2 + 3 +* 4 * 5
2. (10 points) Provide a concrete example of each of the following (in Java). If appropriate, you may use the same example more than once.

   Compile-time error

   Logic error

   Run-time error

   Style error

   Syntax error
3. (10 points) Provide a concise comparison of the two terms in each of the following.

   Actual parameters and formal parameters

   Declaration and assignment

   double and int

   Reference type and value type

   Class and method
4. (5 points) Write a single statement for each of the following that:

   Declares price to be a double variable.

   Assigns the value 40.99 to a previously declared double variable named price.

   Reduces a previously declared double variable named price by 10 percent.

   Assigns the result of a call to a static method named salesTax() (that is passed a previously declared double actual parameter named price) in the Accounting class to a previously declared double variable named tax.

   Displays the value of a previously declared double variable named tax on the console (i.e., standard output) in a field that has a width of 6 with 2 digits to the right of the decimal place.

public class CardChecker{

    public static void main(String[] args) {
       int   digit2;
       ing   digit3;       
       int   group1;
       int   group2;
       int   group3;
       int   group4;
       
       group1 = 6271;
       group2 = 1882;
       group3 = 4132;
       group4 =   71;
       
       if (checkGroup(group1)) {
           System.out.printf("Step A\n");
       }

       digit2 = getDigit(group2);       
       if (digit2 > 1) {
           System.out.printf("Step B\n");
       }
       
       digit3 = getDigit(group3);
       if (digit2 == digit3) {
          System.out.printf("Step C\n");          
       }

       if (group1 > group2) {
          if (group4 > 100) {
             System.out.printf("Step D\n");          
          }
       } else {
          System.out.printf("Step E\n");          
       }
    }


    public static int getDigit(int n) {
       int      result;       

       result = n / 1000;
       return result;       
    }
    


    public static boolean checkGroup(int n) {
       boolean  result;       
       int      remainder;
       
       remainder = n % 2;
       result    = (remainder == 1);       

       return result;       
    }
}