在条目为0时获取用户输入 [英] get user input while the entry is 0

问题描述

您好，



我想制作一个用户可以输入数字的程序（任意数字-2，-3，-4,0,100; 1000）

直到他输入0.

我在while循环中有错误，扫描程序与int不兼容，我怎么能摆脱它？有些东西不见了，我也不知道是什么。帮助。 （如果我写了愚蠢的东西我很新）



我的代码到目前为止：

Hello,

I want to make a program where the user can enter numbers (any number-2,-3,-4,0,100;1000)
until he enters 0.
I have an error at the while loop,scanner is not compatible with int,how can i get rid of that? Something is missing and i dont know what.Help pls. (sry if i wrote stupid things im new )

my code so far:

public static void main(String[] args) {

       // int[] list = new int[10];
        int i;

        System.out.println("Enter numbers :");
        Scanner input = new Scanner(System.in);

        for (i = 1; i < 100; i++) {
            while (input != 0){         // problem here , incompatible Scanner and int
             i = input.nextInt();
            }


        }

    }

Ok. so i get what you said and ty for your help,but its not working with 0.only numbers more then 0.If i neter 0 i get





Exception in thread "main" java.util.regex.PatternSyntaxException: Unclosed character class near index 525
(([-+]?(((((?i)[]|\p{javaDigit})++)|([\p{javaDigit}&&[^0]]((?i)[]|\p{javaDigit})?((?i)[]|\p{javaDigit})?(\,((?i)[]|\p{javaDigit})((?i)[]|\p{javaDigit})((?i)[]|\p{javaDigit}))+)))))|(((((?i)[]|\p{javaDigit})++)|([\p{javaDigit}&&[^0]]((?i)[]|\p{javaDigit})?((?i)[]|\p{javaDigit})?(\,((?i)[]|\p{javaDigit})((?i)[]|\p{javaDigit})((?i)[]|\p{javaDigit}))+)))|(\Q-\E((((?i)[]|\p{javaDigit})++)|([\p{javaDigit}&&[^0]]((?i)[]|\p{javaDigit})?((?i)[]|\p{javaDigit})?(\,((?i)[]|\p{javaDigit})((?i)[]|\p{javaDigit})((?i)[]|\p{javaDigit}))+)))

like this:

<pre lang="cs">public static void main(String[] args) {


         int i;

            System.out.println("Enter numbers :");
            Scanner input = new Scanner(System.in);

            for (i = 1; i < 100; i++) {
                while (input.hasNextInt(8)){        //need 0 here
                 i = input.nextInt();

                //if(input.hasNextInt()){


                 }

                }



    }

}&lt;/pre&gt;</pre>

推荐答案

while (input.hasNextInt()) {
   // ...
}

也许看看类扫描器 [ ^ ]会给出一些有用的例子。

Maybe a look at Class Scanner[^] would give some useful examples of its usage.

import java.util.ArrayList;

import java.util.Scanner;



public class SuccesiuneDeNumerePanaLa0 {



public st atic void main（String [] args）{



int sum = 0;



ArrayList< integer> ; negative_list = new ArrayList< integer>（）;

ArrayList< integer> pozitive_list = new ArrayList< integer>（）;



System.out.println（在列表中输入数字：）;



扫描仪输入=新扫描仪（System.in）;



while（input.hasNextInt（））{



int i = input.nextInt（）;

if（i< 0）{

negative_list.add（i）;

}

如果（i == 0）{

休息;

}

if（i> 0）{

pozitive_list.add（i）;



}



for（int j：pozitive_list）{

sum + = j;

}



}



System.out.println（+ sum）;

System.out.println（+ negative_list.size（））;



}



}

import java.util.ArrayList;
import java.util.Scanner;

public class SuccesiuneDeNumerePanaLa0 {

public static void main(String[] args) {

int sum = 0;

ArrayList<integer> negative_list = new ArrayList<integer>();
ArrayList<integer> pozitive_list = new ArrayList<integer>();

System.out.println("Enter number to the list: ");

Scanner input = new Scanner(System.in);

while (input.hasNextInt()) {

int i = input.nextInt();
if (i < 0) {
negative_list.add(i);
}
if (i == 0) {
break;
}
if (i > 0) {
pozitive_list.add(i);

}

for (int j : pozitive_list) {
sum += j;
}

}

System.out.println(" " + sum);
System.out.println(" " + negative_list.size());

}

}

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