State Clearly All of Your Assumptions

Name :...... Comp 240 Quiz Written 2 ID # :...... Mar 17, 2005 1/3 State clearly all of your assumptions. Q1 (49) Q2 (21) Q3(30) Sum Good luck.

1 (49 pt) In the following questions, check all that apply.

1.a. What is the difference between a float and a double?  double variables store integers and float variables store floating-point numbers.  double variables store numbers with smaller magnitude and coarser detail.  double variables store numbers with larger magnitude and finer detail.

1.b. What is the default initial value of a String?  ""  "default"  default  null

1.c. In an expression containing values of the types int and double, the ______values are ______to ______values for use in the expression.  int, promoted, double.  int, demoted, double.  double, promoted, int.  double, demoted, int.

1.d. What does the expression x %= 10 do?  Adds 10 to the value of x, and stores the result in x.  Divides x by 10 and stores the remainder in x.  Divides x by 10 and stores the integer result in x.

1.e. Which of the following will count down from 10 to 1 correctly?  for ( int j = 10; j <= 1; j++ )  for ( int j = 1; j <= 10; j++ )  for ( int j = 10; j <= 1; j-- )  for ( int j = 10; j > 1; j-- )  for ( int j = 10; j >= 1; j-- ) Name :...... Comp 240 Quiz Written 2 ID # :...... Mar 17, 2005 2/3 1.f. Which of the following statements about the break statement is false?  The break statement is used to exit a repetition structure early and continue execution after the loop.  The break statement, when executed in a while, for or do…while, skips the remaining statements in the loop body and proceeds with the next iteration of the loop.  Common uses of the break statement are to escape early from a loop or to skip the remainder of a switch.

1.g. Suppose variable gender is MALE and age equals 60, how is the expression

( gender == FEMALE ) && ( age >= 65 ) evaluated?  The condition ( gender == FEMALE ) is evaluated first and the evaluation stops immediately.  The condition ( age >= 65 ) is evaluated first and the evaluation stops immediately.  Both conditions are evaluated, from left to right.  Both conditions are evaluated, from right to left.

Q2. (21 pt) What is the output of the code segment below for varying values of q?

switch( q ) { case 1: System.out.println( "apple" ); break; case 2: System.out.println( "orange" ); break; case 3: System.out.println( "banana" ); break; case 4: System.out.println( "pear" ); case 5: System.out.println( "grapes" ); default: System.out.println( "kiwi" ); }

q 0 1 2 3 4 5 6

kiwi apple orange banana pear grapes kiwi grapes kiwi kiwi Output Name :...... Comp 240 Quiz Written 2 ID # :...... Mar 17, 2005 3/3

Q3. (30 pt) What it the output of the following program?

public class Printing {

public static void main(String[] args) {

for ( int i = 1; i <= 5; i++ ) { for ( int j = 1; j <= i; j++ ) System.out.print( '*' );

System.out.println(); } // end of outer for } // end of method main

} // end of class Printing

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