Introduction to Java | Accenture TFA

 

Question 1

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French curly braces { }  is a must if the for loop executes more than one statement. State true or false.

Select one:

True 

False

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The correct answer is 'True'.

Question 2

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Choose...do whilewhilefor  looping structure should be used when the iterations are known.

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Your answer is correct.

The correct answer is:

[for] looping structure should be used when the iterations are known.

Question 3

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 blank   loops will execute the body of loop even when condition controlling the loop is initially false.

  

whiledo‑whilefor

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In a do-while loop, the condition controlling the loop is checked only after executing the body of the loop once.

The correct answer is:

[do‑while]  loops will execute the body of loop even when condition controlling the loop is initially false.

Question 4

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What value is stored in i at the end of this loop? 

for(int i =1;i<=10;i++)

Select one:

9

10

1

11 

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The program control will exit the for loop only when the condition specified in the for loop has failed. Hence, the value of i  will be 11.

The correct answer is: 11

Question 5

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Fill in with appropriate datatype.

switch(Choose...longfloatLongbyte ) 
{ 

    case  value1 : ..........................

    case  value2 : ..........................

     .......................................
  
    default:  
        System.out.println("Hello"); 
}

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Switch in java works with primitive data types byte, short, char and int;
wrapper classes like Character, Byte, Short and Integer;
enumerated types (added in java 5) and String class (added in java 7)

The correct answer is:

Fill in with appropriate datatype.

switch([byte]) 
{ 

    case  value1 : ..........................

    case  value2 : ..........................

     .......................................
  
    default:  
        System.out.println("Hello"); 
}

Question 6

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What will be the output of the program?
for(int i = 0; i < 3; i++) 
{ 
    switch(i) 
    { 
        case 0: break; 
        case 1: System.out.print("one "); 
        case 2: System.out.print("two "); 
        case 3: System.out.print("three "); 
    } 
} 
System.out.println("done");

Select one:

one two three done

done

one two doneone two done

one two three two three done 

Feedback

Switch takes the values 0, 1 and 2.

Case 0 has nothing to execute.

Execution of Case 1 is followed by 2 and 3 since there's no break statement encountered. So, one two three.

Execution of Case 2 is followed 3 since there's no break statement encountered like before. So, two three.

This is followed by "done".

The correct answer is: one two three two three done

Question 7

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What will be the output of the program?
int i = 1, j = -1; 
switch (i) 
{
    case 0, 1: j = 1; /* Line 4 */
    case 2: j = 2; 
    default: j = 0; 
} 
System.out.println("j = " + j); 

Select one:

Compilation fails. 

j = 0

j = 1

j = -1

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One can not specify multiple case labels with commas, as in line 4. Hence compilation error.

The correct answer is: Compilation fails.

Question 8

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The break statement causes an exit ___________

Select one or more:

from the innermost loop 

from the program. 

none of the options

from the innermost switch.  

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Your answer is correct.

The correct answers are: from the innermost switch. , from the innermost loop

Question 9

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What will be the output of the program?
Given:

10. int x = 0;

11. int y = 10;

12. do {

13. y--;

14. ++x;

15. } while (x < 5);

16. System.out.print(x + "," + y);

What is the result?

Select one:

6,6

6,5

5,5 

5,6

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x is assigned 0 and y, 10 initially. During each iteration x is incremented by 1 and y is decremented by 1.

The iteration stops when x equals 5. At this stage y also would have reached the value 5. Hence the output 5 5.

The correct answer is: 5,5

Question 10

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What is the output of this program?

    class selection_statements {

                        public static void main(String args[])

                        {

                            int var1 = 5; 

                            int var2 = 6;

                            if ((var2 = 1) == var1)

                                System.out.print(var2);

                            else 

                                System.out.print(++var2);

                        } 

                    }

Select one:

4

3

2 

1

Feedback

Observe the if construct. var 2 is assigned 1. 1 does not equal 5, hence else block will get executed. Pre increment to var2 results in 2 (var2 variable now has the value 1, not 6). Hence 2 gets printed.

The correct answer is: 2

Question 11

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What is the output of this program?

1. class Crivitch {
2. public static void main(String [] args) {
3. int x = 10;
4.  blank 
5. do { } while (x++ < y);
6. System.out.println(x);
7. }
8. }

Which statement, inserted at line 4, produces the output 12?

   

int y=10;int y=11;int y=12;int y=13;

Feedback

The output expected is 12 (value of x). In line 5, the condition has to fail when the value of x is 11 (x gets incremented by 1 only after the condition checking).

If the condition has to fail when the value of x is 11, then y (the value which is going to remain unchanged in all stages) has to be 11.

The correct answer is:

What is the output of this program?

1. class Crivitch {
2. public static void main(String [] args) {
3. int x = 10;
4. [int y=11;]
5. do { } while (x++ < y);
6. System.out.println(x);
7. }
8. }

Which statement, inserted at line 4, produces the output 12?