Question

我正在尝试将结果从公里转换为英里，但我得到的结果并不正确。

这里似乎有什么问题？

when {
    // TIME: To calculate your time, fill in your distance and pace
    time == null -> {
        val calculatedTime = distance!!.toLong() * timeToSeconds(pace.toString())
        result.text = "The runner's time is ${secondsToTime(calculatedTime)}"
    }
    // DISTANCE: To calculate your distance, fill in your time and pace
    distance == null -> {
        val calculatedDistance = ((timeToSeconds(time).div(timeToSeconds
        (pace.toString()))) * 0.621371).format(2)
        result.text = "Distance is $calculatedDistance Miles"
    }
    // PACE: To calculate your pace, fill in your time and distance
    pace == null -> {
        // Calculate Pace
        val calculatedPace: Long = timeToSeconds(time).toLong() / distance.toLong()

        Log.i("PaceSeconds", calculatedPace.toString() +
                secondsToTime(calculatedPace))

        result.text = "The runner's pace in miles is ${secondsToTime(calculatedPace)}"
    }
}

Answer 1

这是一个四舍五入的问题。让我们分解一下：

val timeInSeconds = timeToSeconds(time)
val paceInSeconds = timeToSeconds(pace)
val timeDivPace = timeInSeconds.div(paceInSeconds)
val calculatedDistance = timeDivPace * 0.621371

使用评论中的示例数据，timeInSeconds为612，paceInSeconds为83.您希望timeDivPace为7.373494，但实际上为7，因为两个整数的除法返回结果为整数。

修复很简单：将被除数或除数转换为浮点数，例如：

val timeDivPace = timeInSeconds.div(paceInSeconds.toFloat())

单位换算公里到英里不会返回预期结果

1 个答案: