import java.util.Scanner;
public class RAnsariSeriesMenu
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("1. Sum of the series");
System.out.println("2. Display series");
System.out.print("Enter your choice: ");
int choice = in.nextInt();
switch (choice) {
case 1:
int sum = 0;
for (int i = 1; i <= 20; i++) {
int x = 2;
int term = (int)Math.pow(x, i);
if (i % 2 == 0)
sum -= term;
else
sum += term;
}
System.out.println("Sum=" + sum);
break;
case 2:
int term = 1;
for (int i = 1; i <= 5; i++) {
System.out.print(term + " ");
term = term * 10 + 1;
}
break;
default:
System.out.println("Incorrect Choice");
break;
}
}
}
1. Sum of the series
2. Display series
Enter your choice: 1
Sum=-699050
Press any key to continue . . .
1. Sum of the series
2. Display series
Enter your choice: 2
1 11 111 1111 11111 Press any key to continue . . .
First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.
Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.
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