在Java中除法结果总是在零（0）？ [英] Division in Java always results in zero (0)?

问题描述

以下的功能会从共享preferences，体重和身高的两个值，我用这些来计算BMI， 当我打印值的内容，我得到我的共享preFS已经输入的值（这是好的），但后来当我对它们运行除法运算，我总是得到0，结果.. 哪里的错误？

 公众诠释computeBMI（）{
    共享preferences customShared preference = getShared preferences（
            myCustomShared preFS，Activity.MODE_PRIVATE）;

    弦高= customShared preference.getString（高度preF，）;
    柱重量= customShared preference.getString（权重preF，）;

    INT重量=的Integer.parseInt（重量）;
    INT高=的Integer.parseInt（高）;
    Toast.makeText（CalculationsActivity.this，身高++重量，Toast.LENGTH_LONG）.show（）;

    INT BMI =体重/（身高×高）;
    返回BMI;

}
 

解决方案

您正在做的整数师。

您需要转换一个操作数为双。

The function below gets two values from sharedpreferences, weight and height, and I use these to calculate the BMI, When I print the content of the values I get the values i have entered in the sharedprefs ( which is good) but then when i run a division operation on them, I always get 0 as a result.. Where is the error?

public int computeBMI(){
    SharedPreferences customSharedPreference = getSharedPreferences(
            "myCustomSharedPrefs", Activity.MODE_PRIVATE);

    String Height = customSharedPreference.getString("heightpref", "");
    String Weight = customSharedPreference.getString("weightpref", "");

    int weight = Integer.parseInt(Weight);
    int height = Integer.parseInt(Height);
    Toast.makeText(CalculationsActivity.this, Height+" "+ Weight , Toast.LENGTH_LONG).show();

    int bmi = weight/(height*height);
    return bmi;

}

解决方案

You're doing integer division.

You need to cast one operand to double.

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