* This is for CS 101 Java class. I can only use \"for\" and “do-while” loops for

Question

* This is for CS 101 Java class. I can only use "for" and “do-while” loops for this lab assignment. I cannot use “while" or any other repetition method. Also I cannot use arrays or cannot create methods other than main method. *

Create a new project Lab05b. Write a menu driven program, that asks the user to provide an integer from 1 to 3. If any number given out of this range, the program should ignore that number and should continue to ask numbers 1-3. If number 1 is given, it should ask two Strings from user and show the common characters in both Strings. It should be case-insensitive, meaning 'A' and 'a' should mean the same thing. There should be no duplicates, even if 'a' is found more than once, it should be displayed only once. If number 2 is given, it should ask the user to provide an integer x and a precision. It should calculate the approximate value of 11 (1 - x) by using the formula given below. Your program stops calculation whenever the increment is less than given precision value. =1+x+x2 +x3 +x4 +x5 + for-1

Explanation / Answer

//copy the below code and save this with name "ans.java" and read the comments for better understanding
//if any problem or doubt occurs feel free to do comment in the comment section

import java.util.Scanner;
import java.util.*;
import java.lang.*;

public class ans {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        //take input choice 1-3
        System.out.println("=== Make Your Selection ===");
        System.out.println("1.Common Characters");
        System.out.println("2.1/(1-x) calculation");
        System.out.println("3.Exit");
        System.out.println("Your Selection:");
        int ch = sc.nextInt();
     

        //for loop for handling the choice
        for( ;ch!=3; ){
            //for handling the choice ,common characters
            if(ch==1){
             
                System.out.println("===Common Characters Program===");
              
              
                System.out.println("Enter a string:");
                String input1 = sc.next();

                System.out.println("Enter another string:");
                String input2 = sc.next();

                //for finding common characters I used two set set1 and set2
                //and insert characters in both set and after tha take intersection of both set
                //remained set after intersection is our result
                //print the resulted set(output of intersection set)
                Set<Character> set1 = new HashSet<Character>();
                Set<Character> set2 = new HashSet<Character>();

                for(char c : input1.toCharArray()) {
                    set1.add(c);
                }
      
                for(char c : input2.toCharArray()) {
                    set2.add(c);
                }

                // Stores the intersection of set1 and set2 inside set1
                set1.retainAll(set2);

                System.out.println("Common characters: ");
                for(char c : set1) {
                    System.out.print(" " + c);
                }
                System.out.println(" ");

            }

            //for handling if choice is 2 i.2; calculaiton of 1(1-x) sum
            if(ch==2){
                System.out.println("=== 1/(1-x) calculation ===");
                System.out.println("Enter an x: (-1,1) :");
                Double x = sc.nextDouble();
                System.out.println("Enter Precision: ");
                Double Precision = sc.nextDouble();
                Double sum = 0.0,sum_prev;
                int i=0;
                do{
                    //sum_prev is used for using while checking condition
                    sum_prev=sum;
                    sum+=Math.pow(x,i);
                    System.out.println("Current Result is: "+sum);  
                    i=i+1;
                //in while condition of less than precision is check
                }while((Math.abs(sum-sum_prev)>Precision));
            System.out.println(" Result is: "+sum);
            }

            System.out.println(" ");

        System.out.println("=== Make Your Selection ===");
        System.out.println("1.Common Characters");
        System.out.println("2.1/(1-x) calculation");
        System.out.println("3.Exit");
        System.out.println("Your Selection:");
        ch = sc.nextInt();
      
        }

        System.out.println("Goodbye");   
    }
}

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