Activity #16 - Random Number, Method, Recursion

int n1 = (int) (Math.random() * 3);  //generates numbers 0-2 only

int n2 = (int) (Math.random() * 3+1);   //generates numbers 1-3 only


GUESSING GAME
#1 Guess the random number from 1-3 only.
methods:
main - calls method guess
guess - generates a random number
          - accepts user's input
          - determines if the user's guess is 'correct' or 'not correct'
          - ask the user to Try Again (recursion)
input - validates user's input (1-3 only) (apply recursion)

solution:
public static void main(String args[])
{ guess( );
}

static void guess( )
{  System.out.println("Input 1-3 only");
    int u = input( );
    int r = (int) (Math.random() * 3+1);
    System.out.println("Random number is "+r);
    if (u == r)
       System.out.println("Correct");
       else
        System.out.println("Not Correct");

    System.out.println("Try Again? Press 'Y' to continue.");
    char ch = sc.next( ).toUpperCase( ).charAt(0);
    if (ch == 'Y')
        guess( );
        else
        return;
}

static int input( )
{  int u = sc.nextInt( );
    if (u<1 || u>3)
        input( );
        else
        return u;
}





#2 Scoring the guessing game
methods:
main - calls method guess
guess - generates a random number
          - accepts user's input
          - determines if the user's guess is 'correct' or 'not correct', update the score if 'correct'
          - ask the user to Try Again (apply recursion),
          - before exit, display the total score/the number of tries
input - validates user's input (1-3 only) (apply recursion for invalid input)

HIGH/LOW

methods: 

main - calls method highlow
guess - generates a random number from 0-10 only
          - accepts user's input
          - determines if the user's guess is 'correct' or 'not correct', update the score if 'correct'
          - ask the user to Try Again (apply recursion),
          - before exit, display the total score/the number of tries
input - validates user's input (0-1 only, 0 means below 6, 1 means above 5 ) (apply recursion for invalid input)