Practice exam 1

Written Portion of Exam 1 - Sample

 

Answer all of the following questions. This is a "closed book" examination and you must work entirely on your own.

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

2. (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. (10 points) Provide a concrete example of each of the following (in Java). If appropriate, you may use the same example more than once. 4. (10 points) Provide a concise comparison of the two terms in each of the following. 5. (5 points) Write a single statement for each of the following that:

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;       
    }
}