Series programs 3

https://java4school.com/pattern-programs-in-java-4

Write a program to print the sum of the following series.
s=1^2-2^3+3^4-4^5+…..to n terms

``````import java.io.*;
class series4
{
public static void main()throws IOException
{
System.out.println("Enter a number of ur choice");
int count=1;
int s=0;
for(int i=1;i<=n;i++)
{
if(count%2==0)
{
s-=Math.pow(i,i+1);
}
else
{
s+=Math.pow(i,i+1);
}
count++;
}
System.out.println(s);
}
}
``````

Write a program to print the following series.
//1,27,125……

``````import java.io.*;
class series6
{
public static void main()throws IOException
{
System.out.println("Enter a number of ur choice");
int sum=0;
for(int i=1;i<=n;i+=2)
{
int cube=(int)Math.pow(i,3);
sum+=cube;
}
System.out.println(sum);
}
} ``````

Write a program to print the sum of the following series.
//1/2 + 3/4 + 5/6 + ……..19/20

``````
import java.io.*;
class series8
{
public static void main()throws IOException
{
System.out.println("Enter a number of ur choice");
int sum=0;
for(int i=2;i<=20;i+=2)
{
int eq=n/i;
sum+=eq;
}
System.out.println(sum);
}
}
``````

Write a program to print the sum of the following series.
s=1 + a^2! – a^3! + a^4! -…… +a^n

``````import java.io.*;
class series_function {
public static int factorial(int num)
{
int fact=1;
for(int i=1;i<=num;i++)
fact*=i;
return fact;
}
public static void main()throws IOException
{
System.out.println("Enter a number for ending the power-n");
System.out.println("Enter a number-a");
int s=0;
int count=1;
for(int i=2;i<=n;i++)
{
int b=(int)Math.pow(a,i);
if(count%2==0)
s+=factorial(b);
else
s-=factorial(b);
}
System.out.println(s);
} }
``````

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