We Keep Coding

One expected line of output is not printed

import java.util.Random;
import java.util.Scanner;
public class Activity3 {
public static void main(String[] args) {
//Variables
Scanner input = new Scanner(System.in);
Random Machine = new Random();
int num = Machine.nextInt(10);
do {
System.out.println("Guess the random generated number of the machine from 1-10");
int guess = input.nextInt();
if (guess == num) {
System.out.println("Correct number= " + num);
System.out.println("You Win!");
} else if (guess <= 0 && guess >= 11) {
System.out.println("Invalid Number!");
}
if (guess > 1 && guess < 10){
System.out.println("You Lose:<");
}
System.out.println("Do you want to try again?");
} while (input.next().equalsIgnoreCase("YES"));
input.close();
}
}
If I guess the correct number it outputs " you win!".
If I guess wrong it outputs "you lose". But If I guess a number that isn't in 1-10 it doesn't output the "Invalid Number" and just proceeds to output the "Do you want to try again?".

Random#nextInt(int) will return a value from 0 to bound - 1, so it's possible that the guess could be 0 in your code. You'd correct this by adding 1 to the guess, for example int num = Machine.nextInt(10) + 1;
Look at your logic...
else if(guess <= 0 && guess >= 11) {
if guess <= 0 AND guess >= 11 ... well, that's impossible.
I would change your logic flow, focusing on "happy paths" first.
That is, is the input within the acceptable range? If so, is guess == num if so, you win, otherwise print error messages.
For example...
Scanner input = new Scanner(System.in);
Random Machine = new Random();
int num = Machine.nextInt(10) + 1;
boolean done = false;
do {
System.out.println("Guess the random generated number of the machine from 1-10");
// Read the WHOLE line of text, removing the new line from the
// buffer which would otherwise be left by Scanner#nextInt
// and would cause no end of issues
String text = input.nextLine();
try {
// Try and parse the text to an int
int guess = Integer.parseInt(text);
if (guess >= 1 && guess <= 10) {
if (guess == num) {
System.out.println("Correct number= " + num);
System.out.println("You Win!");
num = Machine.nextInt(10) + 1;
System.out.println("Would you like to play another game? (Yes/No)");
} else {
System.out.println("Incorrect, guess again");
System.out.println("Do you want to try again? (Yes/No)");
}
// Prompt the user to try again or play another game
text = input.nextLine();
done = !"yes".equals(text.toLowerCase());
} else {
System.out.println("Out of range");
}
} catch (NumberFormatException exp) {
System.out.println("Not a valid number");
}
} while (!done);

Looping this guessing game continuously

I'm fairly new to java and I was wondering how could I reset this game to ask another number after the user guessed it correctly?
Here's my code so far:
import java.util.Scanner;
public class Question2 {
public static void main(String args[]) {
Scanner keyboard = new Scanner(System.in);
int count = 0;
int a = 1 + (int) (Math.random() * 99);
int guess = 0;
System.out.println("Welcome to the Number Guessing Game");
System.out.print("Guess a number between 0 and 100 or enter -1 to end: ");
while (guess != a) {
guess = keyboard.nextInt();
count++;
if (guess < 0 || guess > 100){
if(guess == -1){
System.out.print("Thank you for playing the game!");
break;
}
System.out.print("Out of bounds. Try Again: ");
continue;
}
if (guess > a) {
System.out.print("The number is lower. Try again: ");
}
else if (guess < a) {
System.out.print("The number is higher. Try again: ");
}
else if (guess == a) {
System.out.println("Congratulations. You guessed the number in "
+ count + " tries!");
}
}
}
}

Just wrap your entire code (except for the scanner initialization) in a while loop that is always true. That way, when one game ends, it will start a new one. Then, instead of breaking your game's while loop when the user enters a -1, just use System.exit(0), which will end your program with a status code of 0, indicating that the program executed successfully.
public static void main(String[] args) throws IOException {
Scanner keyboard = new Scanner(System.in);
while (true) {
int count = 0;
int a = 1 + (int) (Math.random() * 99);
int guess = 0;
System.out.println("Welcome to the Number Guessing Game");
System.out.print("Guess a number between 0 and 100 or enter -1 to end: ");
while (guess != a) {
guess = keyboard.nextInt();
count++;
if (guess < 0 || guess > 100) {
if (guess == -1) {
System.out.print("Thank you for playing the game!");
System.exit(0);
}
System.out.print("Out of bounds. Try Again: ");
continue;
}
if (guess > a) {
System.out.print("The number is lower. Try again: ");
} else if (guess < a) {
System.out.print("The number is higher. Try again: ");
} else if (guess == a) {
System.out.println("Congratulations. You guessed the number in "
+ count + " tries!");
}
}
}
}

Wrap your code in a while (true) this will keep on running your code for ever and ever. Make sure you are also updating your random a after every game and your count. Then from there just check if guess is ever -1 and return when it is. When you call return it will end the method which ends your game.
Scanner keyboard = new Scanner(System.in);
while (true){
int count = 0;
int a = 1 + (int) (Math.random() * 99);
int guess = 0;
System.out.println("Welcome to the Number Guessing Game");
System.out.print("Guess a number between 0 and 100 or enter -1 to end: ");
while (guess != a) {
guess = keyboard.nextInt();
count++;
if (guess==-1){
System.out.print("Thank you for playing the game!");
return;
}else if (guess < 0 || guess > 100){
System.out.print("Out of bounds. Try Again: ");
continue;
}
if (guess > a) {
System.out.print("The number is lower. Try again: ");
}
else if (guess < a) {
System.out.print("The number is higher. Try again: ");
}
else if (guess == a) {
System.out.println("Congratulations. You guessed the number in "
+ count + " tries!");
}
}
}

You need to:
move your end game condition in the while condition like this while(guess != -1)
move the welcome greetings inside the loop
move the thank you greeting after the game loop is done
reset count and a when the user won a game in order to start fresh
reset guess on every iteration
Now even if the player guesses the number, the loop does not end and the game loop can be stopped only intentionally (by entering -1 = current break condition):
import java.util.Scanner;
public class Question2 {
public static void main(String args[]) {
Scanner keyboard = new Scanner(System.in);
int count = 0;
int a = 1 + (int) (Math.random() * 99);
int guess = 0;
System.out.println("Welcome to the Number Guessing Game");
while (guess != -1) {
System.out.print("Guess a number between 0 and 100 or enter -1 to end: ");
guess = keyboard.nextInt();
count++;
if (guess < 0 || guess > 100){
System.out.print("Out of bounds. Try Again: ");
continue;
}
if (guess > a) {
System.out.print("The number is lower. Try again: ");
}
else if (guess < a) {
System.out.print("The number is higher. Try again: ");
}
else if (guess == a) {
a = 1 + (int) (Math.random() * 99);
System.out.println("Congratulations. You guessed the number in " + count + " tries!");
count = 0;
}
guess = 0;
}
System.out.print("Thank you for playing the game!");
}
The code can be refactored even more, for example extract functionality into functions in order to make the code more readable. This also leads to easier maintanence should the variables change or should more conditions come. For example the code can be refactored like this:
import java.util.Scanner;
public class Question2 {
public static void main(String args[]) {
Scanner keyboard = new Scanner(System.in);
int a = 0;
int count = 0;
int guess = 0;
startNewGame();
System.out.println("Welcome to the Number Guessing Game");
while (guess != -1) {
System.out.print("Guess a number between 0 and 100 or enter -1 to end: ");
guess = keyboard.nextInt();
count++;
if (guess < 0 || guess > 100){
System.out.print("Out of bounds. Try Again: ");
continue;
}
if (guess > a) {
System.out.print("The number is lower. Try again: ");
}
else if (guess < a) {
System.out.print("The number is higher. Try again: ");
}
else if (guess == a) {
System.out.println("Congratulations. You guessed the number in " + count + " tries!");
startNewGame();
}
resetGuess();
}
System.out.print("Thank you for playing the game!");
}
private static int generateNewA() {
return 1 + (int) (Math.random() * 99);
}
private static void startNewGame() {
a = generateNewA();
count = 0;
}
private static void resetGuess() {
guess = 0;
}
}
Another solution is to use two nested loops, but IMO for this case loop in a loop is too much and makes the source unnecessary complex.

Incorrect message being shown

I can't make this program show the message "Number out of range" when the user put a number out of (1 - 6). I tried different ways of code, but I don't know what I am doing wrong.
public static void main(String[] args) {
int guess = 0;
int tries = 3;
Scanner input = new Scanner(System.in);
Random ran = new Random();
int diceNumber = ran.nextInt(6)+1;
System.out.println(diceNumber);
System.out.println("Insert a number between 1 and 6 : you have " + tries + " tries.");
guess = input.nextInt();
while((tries >1 && (guess <7 || guess>0))) {
tries--;
System.out.println("Incorrect Number, you have " +tries+ " more tries.");
guess = input.nextInt();
}if(guess >=7 || guess<=0 && (tries >1)){
--tries;
System.out.println("Number out of range, try again; you have " + tries + " more tries.");
guess = input.nextInt();
} if(tries ==0 || guess != diceNumber) {
System.out.println("You Lose!!");
} else if(guess == diceNumber){
System.out.println("You Win!!");
}
}

You need to position the condition to check if the input is a valid input or not at the start of the while loop , currently, it will only be checked after all tries are exhausted as you end the while loop before it.
Also, you should change the while loop condition from (tries >1 && (guess <7 || guess>0)) to (tries > 1 && guess != diceNumber) , since you may not want to exit the loop if the number entered is outside the range.
Code -
public static void main(String[] args) {
int guess = 0;
int tries = 3;
Scanner input = new Scanner(System.in);
Random ran = new Random();
int diceNumber = ran.nextInt(6)+1;
System.out.println(diceNumber);
System.out.println("Insert a number between 1 and 6 : you have " + tries + " tries.");
guess = input.nextInt();
while((tries >1 && guess != diceNumber)) {
if((guess >=7 || guess<=0) && (tries >1)){
--tries;
System.out.println("Number out of range, try again; you have " + tries + " more tries.");
guess = input.nextInt();
}
else {
tries--;
System.out.println("Incorrect Number, you have " +tries+ " more tries.");
guess = input.nextInt();
}
}
if(tries ==0 || guess != diceNumber) {
System.out.println("You Lose!!");
} else if(guess == diceNumber){
System.out.println("You Win!!");
}
}

The below code will fetch you the expected result.
import java.util.Random;
import java.util.Scanner;
public class Dice {
public static void main(String[] args) {
int guess = 0;
int tries = 3;
Scanner input = new Scanner(System.in);
Random ran = new Random();
int diceNumber = ran.nextInt(6) + 1;
System.out.println(diceNumber);
System.out.println("Insert a number between 1 and 6 : you have "
+ tries + " tries.");
guess = input.nextInt();
loop: while ((tries >= 1)) {
--tries;
if ((guess >= 7 || guess <= 0) && (tries >= 1)) {
System.out.println("Number out of range, try again; you have "
+ tries + " more tries.");
guess = input.nextInt();
} else {
if (guess == diceNumber) {
System.out.println("You Win!!");
break loop;
} else if (tries >= 1) {
System.out.println("Incorrect Number, you have " + tries
+ " more tries.");
guess = input.nextInt();
}
}
}
if (tries == 0 && guess != diceNumber) {
System.out.println("You Lose!!");
}
}
}

I think the problem is in your while loop.
I'd say it should be something like this:
while(tries > 0 && guess != diceNumber) {
tries--;
if (guess >= 1 && guess <= 6) {
System.out.println("Incorrect Number, you have " +tries+ " more tries.");
} else if (guess >=7 || guess<=0) {
System.out.println("Number out of range, try again; you have " + tries + " more tries.");
}
if (tries > 0) {
guess = input.nextInt();
}
}
if(tries == 0 || guess != diceNumber) {
System.out.println("You Lose!!");
} else if(guess == diceNumber){
System.out.println("You Win!!");
}
I think this should do what you want.
As you can see, I changed the while condition:
You want the user to be able to enter another number while he has at least 1 try left, so tries>0.
You want the user to enter another number only if guess != diceNumber.
The if conditions inside also change:
You only say it's an incorrect number if the entered number is between 1 and 6: guess >= 1 && guess <= 6.
You only say it's out of range if the number is not between 1 and 6: guess >= 7 || guess <= 0.
You don't need to check the number of tries, the while loop does that already.
You only want to get a new input number if the user as a try left: tries > 0.

How can I code a console-based Java game to replay when the user types in "1"?

First of all, I'd like to say that I am REALLY new to all of this... I've tried learning as much as I can, so apologies if any of my code seems ridiculous or all-over-the-place, but I needed somewhere to start. (By the way, credit to the very base of this code goes to CrossCoastGaming: http://tinyurl.com/kktyq4e).
Now to the matter at hand. I have improved (for lack of a better word) on the coding that the man in the video shows, by adding several different phrases, making use of variables and adding a try counter. Here is my code:
import java.util.Random;
import java.util.Scanner;
public class Main {
public static int number, guess, tryCount, replay;
public static int maxValue =1;
public static Scanner scan;
public static Random rand;
public static void main(String args[]) {
scan = new Scanner(System.in);
rand = new Random();
System.out.print("Enter a maximum number: ");
while(maxValue < 2)
maxValue = scan.nextInt();
number = rand.nextInt(maxValue);
System.out.print("Guess a number from 1 to " + maxValue + ": ");
while (guess != number) {
guess = scan.nextInt();
tryCount++;
if (guess < 1) {
System.out.print("Guess is not positive. Try again: ");
}else if (guess < number) {
System.out.print("Too low! Try again: ");
}
if (guess > maxValue) {
System.out.println("Guess is higher than " + maxValue + ". Try again: ");
}else if (guess > number) {
System.out.print("Too high! Try again: ");
}
}
if (tryCount == 1) {
System.out.println("Nailed it! It only took you 1 try!");
}
else {
System.out.println("Nailed it! It took you " + tryCount + " tries.");
}
System.out.println("Type 0 to play again. Type 1 to quit.");
if (replay == 1) {
replay = scan.nextInt();
}
}
}
Ok, so hopefully that gives anyone who knows what they're doing an idea of my goal. Now, as you can see by this line:
if (replay == 1) {
replay = scan.nextInt();
}
I would like to write a way so people can replay the game without having to reboot the file. I already have an idea of what I kind of would like to do, but I've searched everywhere and can't seem to find out what to continue with after this point. I'm sure that I'm missing something. Any help would be greatly appreciated.

You can use a do-while loop to achieve this:
import java.util.Random;
import java.util.Scanner;
public class Main {
public static int number, guess, tryCount, replay;
public static int maxValue = 1;
public static Scanner scan;
public static Random rand;
public static void main(String args[]) {
scan = new Scanner(System.in);
rand = new Random();
do { // start of do-while loop
tryCount = 0; // reset tryCount
System.out.print("Enter a maximum number: ");
while(maxValue < 2) {
maxValue = scan.nextInt();
}
number = rand.nextInt(maxValue);
System.out.print("Guess a number from 1 to " + maxValue + ": ");
while (guess != number) {
guess = scan.nextInt();
tryCount++;
if (guess < 1) {
System.out.print("Guess is not positive. Try again: ");
} else if (guess < number) {
System.out.print("Too low! Try again: ");
}
if (guess > maxValue) {
System.out.println("Guess is higher than " + maxValue + ". Try again: ");
} else if (guess > number) {
System.out.print("Too high! Try again: ");
}
}
if (tryCount == 1) {
System.out.println("Nailed it! It only took you 1 try!");
} else {
System.out.println("Nailed it! It took you " + tryCount + " tries.");
}
do { // check the user's input
System.out.println("Type 0 to play again. Type 1 to quit.");
replay = scan.nextInt();
if (replay != 0 && replay != 1) {
System.out.println("Input not recognized.");
}
} while (replay != 0 && replay != 1);
} while (replay == 0); // end of do-while loop
}
}
do-while loops are always executed at least once. The condition is checked at the end of the loop.

While loop output

The program will generate the correct output for the first number guess but after the user inputs the second guess, there is no output at all. Please help! THANKS
final int number = (int)((Math.random()*99)+1);
int counter = 0;
System.out.print("Enter a guess between 1 and 100: ");
while (keyboard.nextInt() > number) {
System.out.println("Your guess was too high. Try again.");
counter++;
System.out.print("Enter a guess between 1 and 100: ");
}
while (keyboard.nextInt() < number) {
System.out.println("Your guess was too low. Try again.");
counter++;
System.out.print("Enter a guess between 1 and 100: ");
}
while (keyboard.nextInt() == number) {
System.out.println("Congratulations! Your guess was correct!");
counter++;
System.out.println("I had chosen " + number + " as the target number.");
System.out.println("You guessed it in " + counter + " tries.");
if (counter == 1) {
System.out.println("That was lucky!");
}
if (counter >= 2 || counter <= 4) {
System.out.println("That was amazing!");
}
if (counter == 5 || counter == 6) {
System.out.println("That was good.");
}
if (counter == 7) {
System.out.println("That was OK.");
}
if (counter == 8 || counter == 9) {
System.out.println("That was not very good.");
}
if (counter >= 10) {
System.out.println("This just isn't your game.");
}

you really need to change your design pattern.
Once you fail to satisfy the conditions in 1 of those while loops, you code will never go back.
you should only have 1 while loop for the guessing phase. you code should look like this
while(someCondition)
{
int num = keyboard.nextInt()
if (num > number) {
...
}
else if (num < number) {
...
}
else if (num == number) {
...
}
}

Your while loops should be if statements.
There should be a while loop around (practically) all your code
You code should roughly look like:
while(true) {
// prompt for input
// read input
// break from loop if input is the exit input, eg -1
// check input - essentially change your whiles to ifs
}

This block doesn't seem to work as intended:
while (keyboard.nextInt() > number) {
System.out.println("Your guess was too high. Try again.");
counter++;
System.out.print("Enter a guess between 1 and 100: ");
}
while (keyboard.nextInt() < number) {
System.out.println("Your guess was too low. Try again.");
counter++;
System.out.print("Enter a guess between 1 and 100: ");
}
Assume the user enters -1 and then 101. You'll end up in the next loop. Thus you might want to change it to something like this:
boolean retry = true;
while ( retry ) {
counter++;
int n = keyboard.nextInt();
if( n > number ) {
System.out.println("Your guess was too high. Try again.");
}
else if( n < number ) {
System.out.println("Your guess was too low. Try again.");
}
else {
//number found
retry = false;
}
if( retry ) {
System.out.prnt("Enter a guess between 1 and 100: ");
}
}

There is some problem in how you use the while statement.
Here you can find the correct version of your code:
public static void main(final String[] args) {
final Scanner keyboard = new Scanner(System.in);
final int number = (int) ((Math.random() * 99) + 1);
int counter = 0;
System.out.print("Enter a guess between 1 and 100: ");
int user_number;
do {
user_number = keyboard.nextInt();
if (user_number > number) {
System.out.println("Your guess was too high. Try again.");
System.out.print("Enter a guess between 1 and 100: ");
counter++;
} else if (user_number < number) {
System.out.println("Your guess was too low. Try again.");
System.out.print("Enter a guess between 1 and 100: ");
counter++;
}
} while (user_number != number);
System.out.println("Congratulations! Your guess was correct!");
counter++;
System.out.println("I had chosen " + number + " as the target number.");
System.out.println("You guessed it in " + counter + " tries.");
if (counter == 1) {
System.out.println("That was lucky!");
}
if ((counter >= 2) || (counter <= 4)) {
System.out.println("That was amazing!");
}
if ((counter == 5) || (counter == 6)) {
System.out.println("That was good.");
}
if (counter == 7) {
System.out.println("That was OK.");
}
if ((counter == 8) || (counter == 9)) {
System.out.println("That was not very good.");
}
if (counter >= 10) {
System.out.println("This just isn't your game.");
}
}

while(someCondition)
{
if (keyboard.nextInt() > number) {
...
} else if(keyboard.nextInt() < number) {
...
} else {
...
}
}