Quiz on the do Statement

1. What does the following print?

int count = 0;
do
{
  System.out.print( count +" ");
  count++  ; 
}
while ( count < 6 ); 

A.    0 1 2 3 4 5 6

B.    0 1 2 3 4 5

C.    1 2 3 4 5 6

D.    1 2 3 4 5

correct answer:

2. What does the following print?

int count = 10;
do
{
  System.out.print( count +" ");
  count++  ; 
}
while ( count < 6 ); 

A.    It prints nothing

B.    5

C.    6

D.    10

correct answer:

3. What does the following print?

int count = 10;
do
{
  System.out.print( count +" ");
  count--  ; 
}
while ( count >= 5 ); 

A.    10 9 8 7 6 5

B.    10 9 8 7 6 5 4

C.    9 8 7 6 5

D.    9 8 7 6 5 4

correct answer:

4. What does the following print?

int row = 1;
do
{
  int col = 1;
  do
  {
    System.out.print( "*" );
    col++ ; 
  }
  while ( col <= 5 );

  System.out.println();
  row++ ;
}
while ( row <= 3 ); 

A.   

***
***
***
***

B.   

***
***
***
***
***

C.   

*****
*****
*****

D.   

******
******
******

correct answer:

5. What does the following print?

int row = 1;
do
{
  int col = 1;
  do
  {
    System.out.print( "*" );
    col++ ; 
  }
  while ( col <= row );

  System.out.println();
  row++ ;
}
while ( row <= 3 ); 

A.   

*
**
***

B.   

***
**
*

C.   

******
*****
****
***
**
*

D.   

****
****
****

correct answer:

6. What type of loop is implemented with a do statement?

A.    top-driven loop

B.    bottom-driven loop

C.    off-by-one loop

D.    while loop

correct answer:

7. Is the do statement a necessary feature in Java?

A.    No — everything it does could be done with a while.

B.    No — but it would be extremely difficult without it.

C.    Yes — some loops can only be implemented with a do.

D.    Yes — without it one of the major control structures would be lost.

correct answer:

8. What are the branching statements in a programming language?

A.    Statements that affect the execution of loops.

B.    Statements like if that make choices.

C.    Statements that evaluate boolean expressions.

D.    Statements that are used to build classes.

correct answer:

9. What fact about a do loop is responsible for many program bugs?

A.    The do must be matched with a while.

B.    The do is not a good choice for a counting loop.

C.    The body of a do loop is always executed at least once.

D.    Using a do loop sometimes shortens a program.

correct answer:

10. Examine the following code fragment:

int j = 1;
do
{
  System.out.println( j );
  j++ ;
}
while ( j <= 3 ); 

Which of the following for loops does the same thing?

A.   

for ( int j=1; j < 3; j++ )
  System.out.println( j );

B.   

for ( int j=1; j <= 3; j++ )
  System.out.println( j );

C.   

for ( int j=0; j < 4; j++ )
  System.out.println( j );

D.   

for ( int j=0; j <= 3; j++ )
  System.out.println( j );

correct answer:

The number you got right:       Percent Correct:       Letter Grade: