Question

//克到磅和盎司

public static String convertGramsToPoundsAndOunces(String grams) {
    double weightInKG = Double.parseDouble(grams) / 1000;
    double pounds = weightInKG / 0.45359237;
    double lbs = Math.floor(pounds);
    double fraction = (pounds - lbs) * 16;
    return String.valueOf(Math.round(lbs) + "lbs" + " " + String.format("%.1f", new BigDecimal(fraction)) + "oz");
}

//磅数和盎司

public static double convertPoundsToGrams(String pounds, String oz) {
    double lbs = 0;
    double ounces = 0;
    double grams = 0;
    try {
        if (pounds != null && pounds.trim().length() != 0) {
            lbs = Double.parseDouble(pounds);
        }
        if (oz != null && oz.trim().length() != 0) {
            ounces = Double.parseDouble(oz) * 0.062500;
        }
        grams = (lbs + ounces) / 0.0022046;
        return grams;
    } catch (NumberFormatException nfe) {
        System.err.println("Invalid input.");
    }
    return grams;
}

我尝试将磅和盎司转换为克数，并通过转换克数显示相同的磅数和盎司。

我输入1磅和0.9盎司转换回克，但当我将克转换回磅和盎司时我得到1磅和1.1磅... [0.2 ounces is getting increased each time]

Answer 1

convertPoundsToGrams返回double值。要将克数恢复为磅数和盎司，您应该将返回的克（双）值的类型更改为String的类型，因为convertGramsToPoundsAndOunces的参数为String。

试试这个：

double grams = convertPoundsToGrams("1", "0.9"); 
System.out.println(grams);
String grams2PO = String.valueOf(grams);
System.out.println(convertGramsToPoundsAndOunces(grams2PO));

Answer 2

适合我：

double grams = convertPoundsToGrams("1", "0.9");
Log.d(TAG, "Grams: " + grams);
Log.d(TAG, "String grams:" + String.valueOf(grams));
String pounds = convertGramsToPoundsAndOunces(String.valueOf(grams));
Log.d(TAG, "Pound/Oz string: " + pounds);

返回的字符串是“1lbs 0.9oz”。

我猜你是如何将convertPoundsToGrams（返回一个双精度型）的结果转换/传递给convertGramsToPoundsAndOunces，这需要一个字符串。

每次都会增加值的分数

2 个答案: