How to check the previous numbers? - count

Question

i would like to know how to solve my problem.
I am stuck in the middle :(
the question is every time the user makes a guess, check the previous guesses. But totally I have no idea. how to create a single code.
If you help me , it'll mean a lot to me.
Thanks!

Answer 1

You could store all your previous guesses in some kind of array or list and every time you take in new user input loop through the previous guesses and if there's a match output "no more guesses" else: continue guessing?

Answer 2

Consider the following code.
import java.util.Random;
import java.util.Scanner;
public class NumberGuessingGame {
private static final int GUESSES = 10;
private static final int LOWER = 1;
private static final int UPPER = 100;
public static void main(String[] args) {
Random r = new Random();
int num = r.nextInt(LOWER, UPPER + 1);
int[] guesses = new int[GUESSES];
System.out.println(num);
System.out.printf("Guess a number between %d and %d.%n", LOWER, UPPER);
Scanner mySc = new Scanner(System.in);
boolean win = false;
for (int i = 0; i < GUESSES; i++) {
System.out.printf("You have %d guesses left: ", (GUESSES - i));
int guess = mySc.nextInt();
if (guess > UPPER || guess < LOWER) {
System.out.printf("ERROR! You have to pick the number between %d and %d.%n",
LOWER,
UPPER);
i--;
continue;
}
boolean guessed = false;
for (int j = 0; j <= i; j++) {
if (guess == guesses[j]) {
System.out.println("You already tried " + guess);
guessed = true;
break;
}
}
if (guessed) {
i--;
continue;
}
guesses[i] = guess;
if (guesses[i] == num) {
System.out.print("CONGRATS! You are the winner.");
win = true;
break;
}
else {
if (i < GUESSES - 1) {
System.out.println("Hard luck. Try again.");
}
}
}
if (!win) {
System.out.println("You lose. No more guesses");
}
}
}
Here is output from a sample run.
37
Guess a number between 1 and 100.
You have 10 guesses left: 30
Hard luck. Try again.
You have 9 guesses left: 30
You already tried 30
You have 9 guesses left: 111
ERROR! You have to pick the number between 1 and 100.
You have 9 guesses left: 35
Hard luck. Try again.
You have 8 guesses left: 37
CONGRATS! You are the winner.
Each guess is saved in guesses array. After user enters a guess, we iterate through all the guesses that have been entered so far and check if the last guess is in the array. If it is, then it doesn't count as a new guess. Also if the entered guess is not within the allowed range, the guess does not count.
On the last guess, i.e. the tenth guess, we don't print Hard luck. Try again. because the user has no more guesses so they cannot try again.