Question

using Java progam

Q1: What will be the value of x after the following code is executed?

int x = 10;

while (x < 100)

{

x += 100;

}

Q2: What will be the value of x after the following statements are executed?

int x = 10;

switch (x)

{

case 10:

x += 15;

case 12:

x -= 5;

break;

default:

x *= 3;

}

Q3: What is the output of the following progm?

public static void main(String [] args) {

System.out.print("A");

processRequest();

System.out.print("B");

System.out.print("C");

showMenu();

System.out.print("D");

}

public static void showMenu() {

System.out.print("Q");

}

public static void eraseFile()

{

System.out.print("T");

}

public static void processRequest()

{

System.out.print("2");

}

Q4: Write a method declaration called discount which accepts 2 integers as the formal parameters. The two parameters represent the original price and sale price. The method returns the discount value i.e. the difference between the original price and sale price as an integer.

Q5: Write a program that takes two integer variables and prints the largest number using if-else statements.

Q6: public static ______testNumber(int x)

{

if ( x<100 )

{

return "The number is less than 100";

}

else

{

return "The number is greater or equal 100";

}

}

Q7: Write a program using a conditional operator (&&, ||, !)

1. which takes input from user for variables x and y.

2. it should give an output if and only if two numbers are equal, otherwise prompt message numbers are not equal.

Q8: Write a program to print a table of two using a loop.

Q9: Is the call to the method installApplication() below, valid?: Yes/No?

public static void main(String [] args)

{

installApplication("Angry Birds", "version 1.2");

}

public static void installApplication(String appName, int appVersion)

{

// rest of method not important

}

Q10: What will be the values of ans, x, and y after the following statements are executed?

int ans = 35, x = 50, y = 50;

if (x >= y)

{

ans = x + 10;

x -= y;

}

else

{

ans = y + 10;

y += x;

}

Answer 1

Q1)The final value of x will be 110. This is because initially x is initialised to 10. It satisfies the condition of the while loop, inside which it is incremented by 100. So x now becomes 110. Now the condition of the loop is not satisfied and we come out of the loop.

Q2)20

Initially the value of x is 10. The first case inside the switch block matches and the value of x is incremented by 15. So x now becomes 25. Since there is no break statement, the statement in the next case gets executed and x is decremented by 5, making its value to be 20. Now we encounter a break statement and get out of the switch block.

Q3)A2BCQD

This program simply prints in the order of the function calls which occur in the program.

Q4)

public class Main
{
public static void main(String [] args) {
    System.out.println(discount(100,80));
}

public static int discount(int originalPrice,int salePrice){
    return originalPrice - salePrice;
}

}

Q5)

import java.util.Scanner;
public class Main
{
public static void main(String [] args) {
   Scanner sc = new Scanner(System.in);
   int a = sc.nextInt();
   int b = sc.nextInt();
   
   if(a>b)
    System.out.println(a);
   else
    System.out.println(b);
}
}

Q6)String

We can easily see from the code that anytime return statement is used inside the function, it returns a String value. So the return type of the function will be String.

Q7)

import java.util.Scanner;
public class Main
{
public static void main(String [] args) {
   Scanner sc = new Scanner(System.in);
   int x = sc.nextInt();
   int y = sc.nextInt();
   
   if(x!=y)
    System.out.println("Numbers are not equal");
   else
    System.out.println("Numbers are equal");
}
}

Q8)

public class Main
{
public static void main(String [] args) {
  for(int i = 1;i<=10;++i){
      System.out.println("2 * "+i+" = "+(2*i));
  }
}
}

Q9)NO, the call to the method is invalid since the method's definition tells us that it is supposed to receive the first parameter as a String value and the second parameter as an integer value. But, while calling the method, we are passing both the values as String. Hence the call is invalid.

Q10) x = 0 , y = 50 , ans = 60

Initial values of x,y and ans are 50,50 and 35 respectively. Since x is equal to y, so the first condition x>=y is true.

ans now becomes 60 and the value of x is decremented by y's current value. So it becomes 0.