Question

x= Suppose you are building a program for teaching kids' math. Write a java program the does the following: 1. Ask the user if he/she wants to sign-up a. If yes continue to step 2 b. If no Display the message "Thank you, Have a nice Day 2. Ask the user to enter a username. 3. Ask the user to enter a password with at least 8 characters long 4. Write a method with the following header: public static Boolean checkPassword (String s) that checks if the password is 8 characters long. If the password is more than 8 characters long return true otherwise return false. 5. Invoke the method to check the password entered by the user. 6. If true display "your password has been saved" if false ask the user to enter a password again until he/she enters a correct password. 7. Display an addition statement of two random generated numbers for 5 times 8. Each time check the user answer if correct display the message "correct answer" 9. else display "wrong answer, the correct answer is..." 10.At the end of the test display message "well done! See next time"

Answer 1

The code for the required program is given below.

Main.java

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import java.util.*;

public class Main
{
public static final int PASSWORD_LENGTH = 8;
  
public static boolean is_Valid_Password(String password) {

if (password.length() < PASSWORD_LENGTH) return false;

int charCount = 0;
int numCount = 0;
for (int i = 0; i < password.length(); i++) {

char ch = password.charAt(i);

if (is_Numeric(ch)) numCount++;
else if (is_Letter(ch)) charCount++;
else return false;
}

if((charCount + numCount ) >= 8)
return true;
else
return false;
}

public static boolean is_Letter(char ch) {
ch = Character.toUpperCase(ch);
return (ch >= 'A' && ch <= 'Z');
}
public static boolean is_Numeric(char ch) {
return (ch >= '0' && ch <= '9');
}

  
   public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       String signin;
       Random rand = new Random();
       int n1,n2,sum,userAns;
       System.out.print("Do you want to sign up ?");
       signin = sc.nextLine();
       if(signin.equalsIgnoreCase("no"))
       {
       System.exit(0);
       }
       else
       if(signin.equalsIgnoreCase("yes"))
       {
       String user,pass;
       System.out.print("Enter a user name : ");
       user = sc.nextLine();
       System.out.print("Enter a Valid Password : ");
       pass = sc.nextLine();
      
       if (is_Valid_Password(pass)) {
System.out.println("Your Password has been saved");
for(int i=0;i<5;i++){
n1 = rand.nextInt(100);
n2 = rand.nextInt(100);
sum = n1 + n2;
System.out.print(""+ n1 + " + "+ n2 + " = ");
userAns = sc.nextInt();
if(sum == userAns)
{
System.out.println("Correct !");
}
else
{
System.out.println("Wrong ! The Correct answer is " + sum);
}
}
} else {
System.out.println("Your Password is not valid");
}
      
       }
  
   System.out.println("Well Done See you next Time");
   }
}

Output

Do you want to sign up ?yes Enter a user name : Vaibhav Enter a Valid Password : cookies007 Your Password has been saved 0 + 26 = 26 Correct ! 58 + 9 = 67 Correct ! 0 + 82 = 82 Correct ! 22 + 59 = 80 Wrong ! The Correct answer is 81 29 + 60 = 89 Correct ! Well Done See you next Time ... Program finished with exit code o Press ENTER to exit console. I