Page 319 - CA_Blue( J )_Class9
P. 319

Ans.  int ch,a=7,b=2;
                        switch(ch)
                        {
                            case 1:
                                System.out.println("Sum " + (a+b));
                                break;
                            case 2:
                                System.out.println("Difference " +(a-b));
                                break;
                            default : System.out.println("Product " +(a*b));
                        }
                    (ix)  Find the error and correct them:                                                         [2]
                       if(a==1)
                        System.out.println("A is one");
                        else if(b==2);
                         {
                         system.out.println("B is two");
                        else
                         System.out.println("C is three");
                   Ans.  if(a==1)
                            System.out.println("A is one");
                        else if(b==2)
                        {
                            System.out.println("B is two");
                        }
                        else
                            System.out.println("C is three");
                    (x)  What are the final values stored in variables x and y below?                              [2]
                       double a = -6.35;
                        double b = 14.74;
                        double x = Math.abs(a);
                        double y = Math.rint(b);
                   Ans.  x = 6.35
                        y = 15.0

                                                               SECTION B
                                                 Attempt any four questions from this Section.
                       The answers in this Section should consist of the Programs in either BlueJ environment or any program environment
                     with Java as the base. Each program should be written using Variable descriptions/Mnemonic Codes such that the logic
                                                      of the program is clearly depicted.
                                                  Flowcharts and algorithms are not required
                 Question 3.                                                                                      [15]
                 Write a program to input the units of electricity consumed by a customer and print the bill amount to be paid according to the
                 following criteria.
                        Units of electricity                    Rate per unit
                        First 100 units                         4.5 per unit
                        next 250 units                          5.5 per unit
                        next 300 units                          7 per unit
                        above 650 units                         9 per unit
                   Ans.  import java.util.*;
                        class electricity_consumed
                        {
                            public static void main()
                            {
                                Scanner sc=new Scanner(System.in);

                                                                                               Model Test Paper  317
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