Information Practices (IP for class XI & XII)

Java Programs

BASIC PROGRAMS

1. Creating hello java example

class Simple{

public static void main(String args[]){

System.out.println("Hello Java");

}
}

save this file as Simple.java

To compile:	javac Simple.java
To execute:	java Simple

Output:

Hello Java

SAMPLE QUESTION PAPER WITH SOLUTION

1 . Write a Program to calculate charges for sending particles when the charges are as follows

For the ¸rst 1KG Rs.15.00 , For additional weight , for every 500gm or fraction thereof: Rs 8.00

Ans

class Prog1

{

static void test(double wt)//user enters the weight in KGs

{

   System.out.println(“Parcel Weight is “+wt);

   int icharge = 15;

   System.out.println(“Initial charge is “+icharge);

   

   int rwt = (int)((wt-1)*1000);

   System.out.println(“Remaining weight after deducing 1Kg “+rwt);

   int rcharge = (rwt/500)*8;

   System.out.println(“Charge excluding fractional part is Rs.”+(icharge+rcharge));

   int fcharge = (rwt%500>0)?8:0;

   System.out.println(“Charge for fractional part is Rs. “+fcharge);

   int tcharge = icharge+rcharge+fcharge;

   System.out.println(“Total Charge is Rs. “+tcharge);

}

}

2 . A special two-digit number is such that when the sum of its digits is added to the product of

its digits , the result is equal to original number

Example : 59

5+9 = 14

5*9 = 45

45+14 = 59 Therefore , 59 is a special two digit number

Write a program in java to check whether a number is special two-digit number or not

Ans

class Prog2

{

static void test(int num)//user inputs a two-digit number

{

  int m = num;

  int product = 1;

  int sum = 0;

  while(m>0)

  {

   int dig = m%10;

   sum = sum+dig;

   product = product*dig;

   m/=10;

  }

   int nalsum = sum+product;

   if(nalsum==num)

      System.out.println(num+” is a special two digit number “);

   else

     System.out.println(num+ ” is not a special two digit number “);

}

}

3.Write a Java Program to accept a month using Scanner class , and display the number of days

present in that month

Ans :

import java.util.*;

class Prog3

{

static void test()

{

   Scanner in = new Scanner(System.in);

   System.out.println(“Enter the number of month “);

   int choice = in.nextInt();

   switch(choice)

   {

     case 1:

     case 3:

     case 5:

     case 7:

     case 8:

     case 10:

     case 12:

             System.out.println(“No. of days are 31 days “);

             break;

     case 4:

     case 6:

     case 9:

     case 11:

            System.out.println(“No .days are 30 days “);

            break;

     case 2:

            System.out.println(“No. Of days are 28 or 29 “);

            break;

     default : System.out.println(“Wrong Choice “);

}

}

}

4.Write a program to display the following pattern :

1 3 5 7 9

3 5 7 9 1

5 7 8 1 3

7 9 1 3 5

9 1 3 5 7

Ans

class Program4

{

static void teja()

{

    for(int i = 1,l=1;i<=5;i++,l+=2)

    {

      int k = 1;

      for(int j = 1,m=l;j<=5;j++,m+=2)

      {

       if(m>9)

       {

         System.out.print(k+” “);

         k+=2;

       }

       else

          if(l==5&&m==9)

          {

            System.out.print(“8 “);

           }

          else

           System.out.print(m+” “);

       }

        System.out.println();

       }

}

}

5.Write a Program in java to obtain the ¸rst eight numbers of the following series :

1,11,111,1111………………

class Prog5

{

static void test()

{

 double s=0.0;

 int p;

 for(int i = 0;i<=7;i++)

 {

     s=s+Math.pow(10,i);

     p = (int)s;

     System.out.print(p+” , “);

 }

}

}

Section – B

Answer any Four

1.Java language provides various ways to get the data value within a program. Compare the way

of using Command line argument with the way of using Input Stream

Ans

1.To take the input through the Input Stream method , ‘java.io’ package should be imported as

the Input Stream is de¸ned in that package whereas no package is needed to be imported to

take the input using Command Line Method

2.To take the input through the Input Stream Method , two classes , namely (i)

InputStreamReader , and (ii) BufferedReader

whereas in Command Line method no class is needed to be declared.

2.Explain the following Math functions with their output by taking -8.76 as input

(i)Math.Floor()

Ans : Math.Floor(-8.76) returns in a double type value -9.0 , as

-9.0 is the next lowest number to -8.76

(ii)Math.ceil()

Ans:Math.ceil(-8.76) returns in a double type value -7.0 , as

-7.0 is the next highest number to -8.76

3.What is the Syntax for :

(i)for loop

Ans :

for(initial value ; test condition ; step value)

{

Body of the loop

}

(ii)do….while loop

Ans :

Initial value

do

{

body of the loop

step value;

}

while(test condition);

4.What are the differences between if …else and switch…case ?

Ans :

1.If…else results in a Boolean type value whereas switch…case returns in a value of int or char

datatypes

2.If..else can also perform tests on Logical operations whereas switch…case can only perform

test for equality

3.If…else Can perform the test for Strings also whereas switch…case cannot perform tests on

String values

4.Default statement is applied in switch..case whereas it is not applied in if…else

5.What are the differences between Entry controlled loop and exit controlled loop ?

Ans :

1.Entry controlled loop is while loop whereas exit controlled loop is do…while loop

2.Do…while loop will execute at least once , even if the condition is not satis¸ed whereas while

loop will never execute if the condition is not satis¸ed

3.While loop will check the condition ¸rst and then will execute the block whereas do…while

loop will execute the block ¸rst and the check the condition

Section – C

Fill in the blanks

1 . _________ is the process in which a program is validated and _________ is the process in

which the errors in the program are removed

Ans : (i)Testing , (ii) Debugging

2.The ___________ is a selective structure where several possible constant values are checked

for specific value

Ans : Switch case

3.A Java Program executes but doesn’t give the desired output and will not terminate from the

terminal window . Then this is a ______________ error in the program

Ans:Logical Error

4 . A __________ statement in a Java Programming is enclosed in braces

Ans : Compound Statement

5.Generally , for the fixed iterations ________ loop can be used and for the variable iterations

_________ loop can be used.

Ans : (i) for loop , (ii) while loop (or) do-while loop




























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