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Program 10 Write a Java program to find the sum or print the given series as per the user’s choice.
a. Sum of the series
s = 1 – 4 + 9 – 16 + ………… to n terms
b. Print the series
1, 11, 111, 1111, …….… to n terms
1 import java.util.*;
2 class series
3 {
4 public static void main(String args[])
5 {
6 Scanner sc= new Scanner(System.in);
7 int ch, s=0, n, i;
8 System.out.println("a. s = 1 – 4 + 9 – 16 + ………… to n terms");
9 System.out.println("b. 1, 11, 111, 1111, …….…. to n terms");
10 System.out.println("Enter your choice ");
11 ch=sc.next().charAt(0);
12 switch(ch)
13 {
14 case 'a': System.out.println("Enter n term ");
th
15 n=sc.nextInt();
16 for(i=1; i<=n; i++)
17 {
18 if(i%2==0)
19 {
20 s=s-(i*i);
21 }
22 else
23 {
24 s=s+(i*i);
25 }
26 }
27 System.out.println("Sum = " +s);
28 break;
29 case 'b': System.out.println("Enter n term");
th
30 n=sc.nextInt();
222 Touchpad Computer Science (Ver. 3.0)-XI
