Write a program to calculate and print the sum of each of the followin

1.	Write a program to calculate and print the sum of each of the following series:(a) sum (S) = 2-4+6-8+.....-20(b) Sum (S) = x/2 + x/5 + x/8 + x/11 + .... + x/20 (Value of x to be input by the user).
Answer» (a) class series { public static void main() { int s=0; for(int i=2; i<=20; i=i+2) { if(i%4==0) { s=s-i; } else { s=s+i; } } System.out.println(“The Sum of the Series is”+s); } } (b) class series { public static void main() throws IOException { BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); System.out.println(“Enter the value of x:”); int x = Integer.parseInt(br.readLine( )); double s=0; for(int i=2; i<=20; i=i+3) { s=s+(double)x/i; } System.out.println(“The Sum of the Series is”+s); } }

Write a program to calculate and print the sum of each of the following series:(a) sum (S) = 2-4+6-8+.....-20(b) Sum (S) = x/2 + x/5 + x/8 + x/11 + .... + x/20 (Value of x to be input by the user).

Answer»

(a)

class series

{

public static void main()

{

int s=0;

for(int i=2; i<=20; i=i+2)

{

if(i%4==0)

{ s=s-i;

}

else

{

s=s+i;

}

System.out.println(“The Sum of the Series is”+s);

}

(b)

class series

{

public static void main() throws IOException

{

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

System.out.println(“Enter the value of x:”);

int x = Integer.parseInt(br.readLine( ));

double s=0;

for(int i=2; i<=20; i=i+3)

{

s=s+(double)x/i;

}

System.out.println(“The Sum of the Series is”+s);

}