Page 177 - computer science (868) class 11
P. 177

31                      for(i=1; i<=n; i++)
                  32                      {

                  33                          s=s*10+1;
                  34                          System.out.print(s+ " , ");

                  35                      }
                  36                      break;

                  37                  default: System.out.println("Wrong Choice");
                  38              }
                  39          }

                  40      }

                 The output of the preceding program is as follows:

                 a.  s = 1 - 4 + 9 - 16 + ………… to n terms
                 b.  1, 11, 111, 1111, ……..… to n terms
                 Enter your choice
                 a
                       th
                 Enter n  term
                 5
                 Sum = 15



                  Program 11     Write a program in Java to find the sum of the given series after accepting the value of ‘n’
                                 from the user.
                                                 1
                                                             1
                                                     1
                                        1.  s = 1 +   +   + ….. +
                                                 2   3       n
                                              1
                                                         4
                                                 2
                                                     3
                                        2.  s =   +   +   +   + …. + to n terms
                                              a  a   a   a
                   1      import java.util.*;
                   2      class series2
                   3      {

                   4          public static void main()
                   5          {

                   6              Scanner sc= new Scanner(System.in);
                   7              int ch, n, i;

                   8              double s=0, a;
                   9              System.out.println("1. s = 1 + 1/2 + 1/3 + ..... 1/n");

                  10              System.out.println("2. s = 1/a + 2/a + 3/a + 4/a +.... + to n terms ");
                  11              System.out.println("Enter your choice ");





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