Question

我必须创建一个彩票游戏，你随机生成六个模拟彩票的中奖号码。要求用户输入六个数字，看看他们是否赢了彩票！

我做了很多，但现在我卡住了。我是java的新手，请原谅我。当它提示要求另一个号码时，它会这样做，但它仍然会显示它显示的自制彩票。此外，当显示计算机制作的乐透号码的数字时，它们是相同的数字，重复并且不是6个数字。柜台也不起作用，也许是一件小事，但我无法弄明白。谢谢

package arraysIntroduction;

import java.util.Scanner;

public class sizeQuestion {

public static void main(String[] args) {

    Scanner in = new Scanner (System.in);

    int [] user =new int [6];
    int i;
    //Fill user array 

        System.err.println("Welcome to Miwand's Lottery");
        System.out.println("Please enter your 6 desiered number to enter the lottery");
        System.out.println("Pick from 1 to 49");

    for (  i=0;i<user.length;i++) // gets numbers until it equals 6
    {
        System.out.println("Number:");

        user[i]= in.nextInt(); // Gets numbers from user

        while  (user[i] < 0 ) // if its a negative number tell user to enter again
        {
        System.err.println("Negative number, please enter again:");
        user[i]=in.nextInt();
        }

if (user[i] > 49) // if the number goes past 49 prompt again
{
    System.err.println("Please enter numbers from 1 - 49");
    }
}


    //print out the numbers generated
    for ( i=0;i < user.length; i++){
        System.out.print(+user[i]+ " ");    

    }

System.out.println(" ");

int[] lottery = new int[6];

int guesses;
int counter=0;
int j;
int x;
    {
for (j = 0; j < 6; j++) {
int randomNum = (int) (Math.random() *49 +1); // Random number created here.
for ( x = 0; x < j; x++) {
    if (lottery[x] == randomNum) // Here, code checks if same random number    generated before.
    {
        randomNum = (int) (Math.random() *49 +1);// If random number is same, another number generated.
    }
    lottery[j] = randomNum;
}
}



//prints out computer generated numbers

for (i = 0; i < lottery.length; i++){
for (x = 0; x< j; x++){
 System.out.print(lottery[i] + " ");
if (user[i] == lottery[x] ){
    counter++;
    }
}
}
    }
if (counter < 2){

    System.out.println("Try again!");
}

if (counter == 3){

    System.out.println("3 numbers matched! You won $300!");
}

if (counter == 4){

    System.out.println("4 numbers matched! You won 500!");
}

if (counter == 5){

    System.out.println(" 5 numbers matched! You won $1000!");
}

else if (counter == 6){

    System.out.println("JACCKKKPOOOOTTTTTTT!!!!!! YOU WIN 1 MILLION DOLLARS!");
    }
}
        }

Answer 1

我在你的程序中看到了多个问题。

首先，可以通过将print语句从内部循环移动到外部循环来解决打印输出问题

for (i = 0; i < lottery.length; i++) {
    System.out.print(lottery[i] + " ");
    for (x = 0; x < j; x++) {
        if (user[i] == lottery[x]) {
            counter++;
        }
    }
}

此外，您没有正确分配第一个随机数，它始终使用默认值，即0

解决方案：

 for (j = 0; j < 6; j++) {
    int randomNum = (int) (Math.random() * 49 + 1); // Random number created here.
    for (x = 0; x < j; x++) {
        if (lottery[x] == randomNum) // Here, code checks if same random number    generated before.
        {
            randomNum = (int) (Math.random() * 49 + 1);// If random number is same, another number generated.
        }
    }
    lottery[j] = randomNum;
}

另外，你没有检查计数器是否等于2

解决方案：

if (counter <= 2) {
   System.out.println("Try again!");
}

并且，＆＃34;如果随机数相同，则生成另一个数字。＆＃34;可能不正确，因为它可能会再次产生相同的数字。您需要一个while循环来生成一个新数字，直到它不等于任何生成的数字。

关于编码风格的另一个问题是，对于任何＆＃34; for循环＆＃34;

这：

int i=0;
for (i = 0; i < length; i++)

应该替换为：

for (int i = 0; i < length; i++)

Answer 2

正如我在评论中已经说过的那样，你应该将print语句从内部循环移动到外部循环。

您的代码应如下所示：

for (i = 0; i < lottery.length; i++) {   // outer loop
    System.out.print(lottery[i] + " ");
    for (x = 0; x < j; x++) {            // inner loop
        if (user[i] == lottery[x]) {
            counter++;
        }
    }
}

使用数组

2 个答案: