import java.io.*;
class menu
{
public static void main() throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
int ch;
System.out.println("Choose one of the following:");
System.out.println("a)1/4 +1/8+ 1/12........n \nb)1/1!-2/2!+3/3!.......n");
System.out.println("Enter ur choice:");
ch=Integer.parseInt(br.readLine());
switch(ch)
{
case 1:
double s=0.0,n,a=4,m;
System.out.println("Enter the number till u want series executin:");
n=Double.parseDouble(br.readLine());
for(int i=1;i<=n;i++)
{
m=a*i;
s=s+(1/m);
}
System.out.println("Fractional sum:"+s);
break;
case 2:
double p=0.0,f=1.0,n1;
System.out.println("Enter the number till u want series executin:");
n1=Double.parseDouble(br.readLine());
for(int i=1;i<=n1;i++)
{
f=f*i;
if(i%2!=0)
p=p+(1/f);
else
p=p-(1/f);
}
System.out.println("Factorial sum "+p);
break;
default:
System.out.println("Invalid Entry");
}
}
}
saak
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