对于循环更改随机数

Question

My RandomNumber value changes in my for loop statement. This prevents the program from actually matching the RandomNumber generated with the number entered by the user. How can I modify my for loop so that it does not affect the RandomNumber?

This is the java code I did in NetBeans;

package numberguess;

/**
 * 
 * @author Marion
 */
public class NumberGuess {

    /**
     * @param args
     *            the command line arguments
     */
    public static void main(String[] args) {
        int randNum = 0, guessNum = 0;
        // Generates a random number from 1 to 10
        randNum = new java.util.Random().nextInt(10) + 1;
        System.out.println("I am thinking of a random number from 1 to 10");
        for (randNum = 0; randNum < 3; randNum = randNum + 1) {
            System.out.print("Guess?");
            java.util.Scanner scan = new java.util.Scanner(System.in);
            guessNum = scan.nextInt();
            System.out.println("You guessed " + guessNum);
            if (randNum == guessNum) {
                System.out.println("You Guessed it!");
                break;
            }
        }
    }
}

Answer 1

You have to use a different variable for counting in the loop. You're assigning to randNum in

for (randNum = 0; randNum <3; randNum = randNum + 1)

Answer 2

for (randNum = 0; randNum <3; randNum = randNum + 1)

改成

for (int i= 0; i<3; i = i+ 1)

Answer 3

Here: Please note that I moved the Scanner outside the loop since you do not need to have it created multiple times.

public static void main(String[] args) {
    int randNum = randNum = new java.util.Random().nextInt(10) + 1;
    int guessNum = 0;
    java.util.Scanner scanner = new java.util.Scanner(System.in);

    System.out.println("I am thinking of a random number from 1 to 10");
    for(int i =0; i < 3; i++) {
        System.out.print("Guess?");
        guessNum = scanner.nextInt();
        if(randNum == guessNum) {
            System.out.println("You Guessed it!");
            break;
        }
        System.out.println("You guessed " + guessNum);
    }
  }
}

Answer 4

I have just assign another variable for for loop.

for (int rand1 = 0; rand1 <3; rand1 = rand1 + 1)
{

      if (rand1 == guessNum)
      { 
                System.out.println("You Guessed it!");
                        break;
      }
}