java为什么我的增量计算不正确？

Question

我运行了一个for循环，它要求他们输入增量数。但当它输出表格时，它实际上是增量的两倍。所以如果我把10放在incr里，它会上升20。请帮忙

for (double x = fah1; x <= fah2; x+=incr) {
    double cel = 5/9.0 * (x-32);
    if (x <= 99){
        System.out.println(x + "               " + df.format(cel);
        x+= incr;
    }
    else {
        System.out.println(x + "              " + df.format(cel));
        x+=incr;
    }
}

Answer 1

递增两次，一次在for循环声明中，一次在if-then-else语句中：

尝试将其更改为：

for (double x = fah1; x <= fah2; x+=incr) {
    double cel = 5/9.0 * (x-32);
    if (x <= 99){
        System.out.println(x + "               " + df.format(cel);
        // Remove the increment from here
    }
    else
    {
        System.out.println(x + "              " + df.format(cel));
        // Remove the increment from here
    }
}