Java程序打印出0而不是百分比

我正在做一個項目，這部分程序無法正常工作。它要求輸入字符，然後它讀取給定的文本文件，並輸出文本文件中出現的該字母的百分比。下面的代碼：Java程序打印出0而不是百分比

public static void inputLetterFrequency() { 
    String letterInput = JOptionPane.showInputDialog("Please input a letter to find out the frequency"); 
    letterInput.toUpperCase(); 
    char c = letterInput.charAt(0); 
    content = content.toUpperCase(); 

    for (int i = 0; i < content.length(); i++) { 
     if (content.charAt(i) == c) { 
      letterOccurence++; 
     } 
    } 

    letterFrequency = (letterOccurence/numberCharacters) * 100.0; 

    JOptionPane.showMessageDialog(null, "Frequency of letter " + c + " is " + letterFrequency + "%"); 
    String tryAgain = JOptionPane.showInputDialog("Please choose an option: \n1 to input another letter \n2 to exit "); 
    int n = Integer.parseInt(tryAgain); 
    if (n == 1) { 
     CharacterAnalyzer.inputLetterFrequency(); 
    } else { 
     System.exit(0); 
    }

以下是在文件的開頭聲明

public static int numberCharacters; 
public static String Filename = UserPrompt.content; 
public static int letterOccurence; 
public static double letterFrequency; 
public static int digitOccurence; 
public static double digitFrequency;

來源

2012-11-27 user1858131

這是你的代碼計算letterFrequency： -

letterFrequency = (letterOccurence/numberCharacters) * 100.0;

只需更改上面的代碼： -

letterFrequency = letterOccurence * 100.0/numberCharacters;

在第一代碼： - (letterOccurence/numberCharacters)將首先被評估，因爲這是一個integer division，其結果將是0，如果numerator小於denominator。

要使它成爲floating-point division，只需在dividing之前將分子乘以100.0即可。

來源

2012-11-27 23:18:08

Java程序打印出0而不是百分比

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