Question

我正在尝试创建代码来计算最小值和最大值（含）之间的百分比。此代码的输出应为50.0，但我的值为100.0。有什么想法为什么会这样？谢谢！编辑：代码可以编译，并且我没有除法问题。我对为什么数字不同感到困惑。谢谢！

public class Test {
  public static double tempCheck(double[][] temps, double minTemp, double maxTemp) {
    int i;
    int betweenTemps = 0;
    double percentage = 0.0;
    int j;
    int numVals = 0;
    for (i = 0; i < temps.length; i++) {
      for (j = 0; j < temps[i].length; j++) {
        if (temps[i][j] >= minTemp && temps[i][j] <= maxTemp) {
          betweenTemps++;
        }
      }
      numVals++;
    }
    percentage = (betweenTemps / numVals) * 100;
    return percentage;
  }
  public static void main(String[] args) {
    double[][] temps = {
      { 72.0, 78.0, 74.5 },
      { 79.0, 80.0, 71.0 }
    };
    double minTemp = 70.0;
    double maxTemp = 75.0;
    System.out.println(tempCheck(temps, minTemp, maxTemp));
  }
}

Answer 1

https://ideone.com/B8rDJA

public class Test {
  public static double tempCheck(double[][] temps, double minTemp, double maxTemp) {
    int i;
    int betweenTemps = 0;
    double percentage = 0.0;
    int j;
    int numVals = 0;
    for (i = 0; i < temps.length; i++) {
      for (j = 0; j < temps[i].length; j++) {
        if (temps[i][j] >= minTemp && temps[i][j] <= maxTemp) {
          betweenTemps++;
        }
        numVals++;
      }
    }
    percentage = ((double) betweenTemps / (double) numVals) * 100.0;
    return percentage;
  }
  public static void main(String[] args) {
    double[][] temps = {
      { 72.0, 78.0, 74.5 },
      { 79.0, 80.0, 71.0 }
    };
    double minTemp = 70.0;
    double maxTemp = 75.0;
    System.out.println(tempCheck(temps, minTemp, maxTemp));
  }
}

您需要在嵌套循环内递增numVals，并将结果转换为两倍以得到准确的结果。

为什么此代码的输出不正确？

1 个答案: