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除以0错误/对不起,我的句子是PT

java

José Filipe Silva · 技术社区 · 2 年前

我对这个编程领域还很陌生,我正在学习5级课程,现在正在学习java。

我试着在家里做一些练习,现在我正试图建立一个算法,让用户选择(N)个数字,然后随机显示它们,并得出所有负数的平均值,以及所有正数的百分比。

但我的计数器有一个错误,说它不能除以0,我甚至试图将它初始化为1,在我计算之前,我从他那里取-1,得到它的原始值,但它不起作用。

希望能在这里得到启发!非常感谢!

import java.util.Random;
import java.util.Scanner;


public class Main {
    public static void main(String[] args) {

        Random random = new Random();
        Scanner ler = new Scanner(System.in);      //ler stands for read 
        int nPos = 0, nNeg = 0, totalPos = 0, totalNeg = 0, contador = 1; 

//contador stands for counter 
        
        int N;
        double mediaNeg, percPos; //media stands for average 

        System.out.println("Insira o nÃºmero de nÃºmeros que pretende inserir: "); 

// this print stands for insert the number of numbers you intend to insert
      
        N = ler.nextInt();

        for (int i = 0; i == N-1; i++){
            int num = random.nextInt(101) - 50;
            System.out.println(num);
            contador ++;
                if (num > 0){
                    nPos ++;
                    totalPos += num;
                }
                else if (num < 0){
                    nNeg ++;
                    totalNeg += num;
                }

        }

        contador = contador - 1;
        mediaNeg = (double) totalNeg / nNeg;
        percPos = (double) (totalPos / contador) * 100;

        System.out.println("MÃ©dia dos negativos = " +mediaNeg);
        System.out.print("Percentagem dos positivos = " +percPos); 

//These two are supposed to show the average of the negative numbers, and the percentage of the positives. 


    }
}

2 回复 | 直到 2 年前

Owais Yosuf 2 年前

您的代码看起来基本正确,但for循环条件中有一个小问题。循环应继续,同时 i 小于 N ,而不是在 i == N-1 。正确的循环条件是 i < N 。这是更正后的代码:

import java.util.Random;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Random random = new Random();
        Scanner ler = new Scanner(System.in);
        int nPos = 0, nNeg = 0, totalPos = 0, totalNeg = 0, contador = 1;

        int N;
        double mediaNeg, percPos;

        System.out.println("Insira o nÃºmero de nÃºmeros que pretende inserir:");

        N = ler.nextInt();

        for (int i = 0; i < N; i++) { // Corrected loop condition
            int num = random.nextInt(101) - 50;
            System.out.println(num);
            contador++;
            if (num > 0) {
                nPos++;
                totalPos += num;
            } else if (num < 0) {
                nNeg++;
                totalNeg += num;
            }
        }

        contador = contador - 1;

        // Check if nNeg is not zero to avoid dividing by zero
        if (nNeg != 0) {
            mediaNeg = (double) totalNeg / nNeg;
            System.out.println("MÃ©dia dos negativos = " + mediaNeg);
        } else {
            System.out.println("NÃ£o hÃ¡ nÃºmeros negativos para calcular a mÃ©dia.");
        }

        // Calculate percentage only if there are positive numbers
        if (contador != 0) {
            percPos = (double) (totalPos / contador) * 100;
            System.out.print("Percentagem dos positivos = " + percPos);
        } else {
            System.out.println("NÃ£o hÃ¡ nÃºmeros positivos para calcular a percentagem.");
        }
    }
}

这些更改应该有助于避免除以零的误差,并提供更准确的结果。我还添加了一些检查,以处理用户没有输入负数或正数的情况。

José Filipe Silva 2 年前

对不起,大家,我的评论放错了,现在我不知道如何编辑帖子。第一次使用这个,我真的很抱歉,但基本上我的评论指的是一些东西,不是在下面,而是在上面。谢谢