Java:找到百分之差

Question

我试图找出如何找到原始(无空格)文本字符串与已删除(无空格)文本字符串之间的百分比差异。我试图通过使用等式( no挂载-还原/reducedAmount)来实现这一点，但是我没有运气，最终得到的值为零，如下所示。

谢谢!

我的守则：

import java.util.Scanner;

public class Prog5 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner console = new Scanner(System.in);

        System.out.println("Welcome to the disemvoweling utility!"); // Initially typed "disemboweling" xD
        System.out.print("Enter text to be disemvoweled: ");
        String inLine = console.nextLine();
        String vowels= inLine.replaceAll("[AEIOUaeiou]", ""); // RegEx for vowel control
        System.out.println("Your disemvoweled text is: " + vowels); // Prints disemvoweled text

    // Used to count all characters without counting white space(s)
    int reducedAmount = 0;
    for (int i = 0, length = inLine.length(); i < length; i++) {
        if (inLine.charAt(i) != ' ') {
            reducedAmount++;
        }
    }

    // newAmount is the number of characters on the disemvoweled text without counting white space(s)
    int newAmount = 0;
    for (int i = 0, length = vowels.length(); i < length; i++) {
        if (vowels.charAt(i) != ' ') {
            newAmount++;
        }
    }

    int reductionRate = ((newAmount - reducedAmount) / reducedAmount); // Percentage of character reduction


    System.out.print("Reduced from " + reducedAmount + " to " + newAmount + ". Reduction rate is " + reductionRate + "%");

    }
}

我的输出：(测试字符串没有引号：“测试请”)

Welcome to the disemvoweling utility!

Enter text to be disemvoweled: Testing please

Your disemvoweled text is: Tstng pls

Reduced from 13 to 8. Reduction rate is 0%

Answer 1

在执行整数除法时计算百分比差时使用了整数数据类型。您需要在方程的右边键入cast变量之一以执行双除法，然后将它们存储在double中。这样做的原因是java整数类型无法保存实数。另外，乘以100就可以得到百分比。

double reductionRate = 100 * ((newAmount - reducedAmount) / (double)reducedAmount);

如果你想要0到1之间的分数，那么

double reductionRate = ((newAmount - reducedAmount) / (double)reducedAmount);

Answer 2

你的公式给出了一个介于0到1之间的值。

整数不能容纳分数，所以它总是显示零。

乘以100得到一个有规律的百分比值。

int reductionRate = 100*(newAmount - reducedAmount) / reducedAmount; // Percentage of character reduction