Page 320 - CA_Blue( J )_Class9
P. 320

int u;
                                 double b;
                                 System.out.println("Enter unit consumed ");
                                 u=sc.nextInt();
                                 if(u<=100)
                                     b=u*4.5;
                                 else
                                 if(u<=350)
                                     b=(100*4.5)+(u-100)*5.5;
                                 else
                                 if(u<=650)
                                     b=(100*4.5)+(250*5.5)+(u-350)*7;
                                 else
                                     b=(100*4.5)+(250*5.5)+(300*7)+(u-650)*9;
                                 System.out.println("Bill amount "+b);
                             }
                         }
                  Question 4.                                                                                      [15]
                  Write a menu-driven program to calculate:
                     (a)  Area of a circle
                     (b)  Area of a square
                     (c)  Area of a rectangle
                     Input any one choice(c for circle / s for square / r for rectangle) and calculate the Area according to the choice.
                    Ans.  import java.util.*;
                         class area
                         {
                             public static void main()
                             {
                                 Scanner sc=new Scanner(System.in);
                                 double ac = 0.0, r;
                                 int ch, l,b,s,as=0,ar=0;
                                 System.out.println("Enter c for circle / s for square / r for rectangle ");
                                 ch=sc.next().charAt(0); // Syntax to input a character from console
                                 switch(ch)
                                 {
                                     case 'c' :
                                     case 'C': System.out.println("Enter radius of circle ");
                                         r=sc.nextDouble();
                                         ac=22.0/7.0 * r * r;
                                         System.out.println("Area of Circle " +ac);
                                         break;
                                     case 's' :
                                     case 'S': System.out.println("Enter side of a square ");
                                         s=sc.nextInt();
                                         as=s * s;
                                         System.out.println("Area of Square " +as);
                                         break;
                                     case 'r' :
                                     case 'R': System.out.println("Enter length of a rectangle ");
                                         l=sc.nextInt();
                                         System.out.println("Enter breadth of a rectangle ");
                                         b=sc.nextInt();
                                         ar=l * b;
                                         System.out.println("Area of Rectangle " +ar);
                                         break;


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