Question

Please try to explain the answers as well. It will be highly appreciated.

• Output of the following expression:

5 * 4 % 2 = ?

• Output of a loop:
  • Example: What will be the output of the Java code (Assume all variables are properly declared.)

num = 10;

while (num <= 32)

                num = num + 5;

System.out.println(num);

• What will be the output of the Java code (Assume all variables are properly declared.)

public class test

{

   public static void main(String[] args)

   {

      int n1 = 8;

      int n2 = 3;

      double answer = (double ) n1 / n2;

      System.out.println(“The answer is “ + answer);

   }

}

Note: Check with and without type casting.

• What will be the output of the Java code (Assume all variables are properly declared.)

for (int i = 1; i <= 3; i++)

{

for (int j = 2; j <= 3; j++)

{

                                                System.out.println(I + ”,”+ j);

                }

}

Answer:

• Question:

Suppose x = 19.5. What will be the output of the statement

System.out.println((int)(x) % 3);

• What will the output of the following Java code (Assume all variables are properly declared and the input is 3 4 –1).

num = console.nextInt();

sum = num;

while (num != -1)

{

     num = console.nextInt();

     sum = sum + num;

}

Answer:

• What is the output of the following code Fragment?

int i =10;

while(true)

{

                i = i-1;

      if(i<= 6)

break;

System.out.print(i+ " ");

}

Answer:

• What is the output of the following Java code:

int alpha = 5;

int beta = 4;

switch (beta)

{

case 2:

   alpha = alpha + 2;

case 4:

   alpha = alpha + 4;

   break;

case 6:

   alpha = alpha + 6;

default:

    alpha = alpha + 10;

}

System.out.print(alpha);

a.            7              c.             11

b.            9             d.            15

• What is the output of the following code?

int i;

int result = 5;

for (i = 0; i <= 2; i++)

{

   result = result + 2;

   System.out.print(result + " ");

}

Write a line of code to call a method named printMe. The method has no return value and no arguments.

Find one error:

if (answer = male)

{

     //comment

}

else (answer == female)

{

   //comment

}

Answer 1

5 * 4 % 2 = 0
Evaluation process will start from left. * has higher precedence compared to % so first it will multiply 5 and 4
=20 % 2 = 0

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

        int num = 10;
        while (num <= 32)
                num = num + 5;
        System.out.println(num);

It will print 35
In first iteration num will be 10+5=15 which is less than 32
In second iteration num will be 15+5=20 which is less than 32
In third iteration num will be 20+5=25 which is less than 32
In fourth iteration num will be 25+5=30 which is less than 32
In fifth iteration num will be 30+5=35 which is no less than 32. So it will exit from while loop and print 35

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

It will print
The answer is 2.6666666666666665
Here, in line
          double answer = (double ) n1 / n2
i is getting converted to double so it will be 8.0/3, so it will return result in decimal which will be 2.6666666666666665

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

Output will be
1,2                                                                                                                                          
1,3                                                                                                                                          
2,2                                                                                                                                          
2,3                                                                                                                                          
3,2                                                                                                                                          
3,3

Here, i is iterating 3 times and for each I, j is iterating 2 times and printing 2 and 3 for each i.

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

Output will be 1.

Here in line
(int)(x) % 3
x is getting typecast with int so x will became 19 and 19%3 will be 1

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

num = console.nextInt();
sum = num;
while (num != -1)
{
     num = console.nextInt();
     sum = sum + num;
}

It will take input from user and add it to variable sum. It will stop taking input when user enters -1
So, it will print sum of all the values entered by user except last entry of -1

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

int i =10;
while(true)
{
                i = i-1;
      if(i<= 6)
break;
System.out.print(i+ " ");
}
It will print 9 8 7
First time, i=10-1=9 which is >=6 so it will print 9
Second time, i=9-1=8 which is >=6 so it will print 8
Third time, i=8-1=7 which is >=6 so it will print 7
Fourth time, i=7-1=6 which is <=6 so break and exit from program

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

It will print 9

Here in switch case 4 will pass and it will go to the case  
   alpha = alpha + 4;
   alpha = 5 + 4;
   alpha = 9

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

it will print 7 9 11

Initially value of result = 5
Loop will run 3 time from 0 to <=2
First time result = result + 2
       = 5 + 2 = 7
Second time result = result + 2
       = 7 + 2 = 9
Third time result = result + 2
       = 9 + 2 = 11
So it will print 7 9 11

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

This is the method named printMe which has no return value and no arguments.

void printMe()
       {
                        //your code here
       }

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

Line else (answer == female) is having an error

We can not write any condition in else statement. Correct code is

if (answer = male)
{
        //comment
}
else
{
    //comment
}