Question

我从我的函数收到不一致的结果，它将减去32位不同长度的数组中的元素。它不是从两个数组的末尾开始，而是从第二个数组的开始处开始直到结束。我有点困惑，为什么，因为我的循环从最后开始。任何帮助将不胜感激。

int carry = 0;
    int total = Math.max(tempArray.length, tempArrayTwo.length);
    int[] subArray = new int[total];
    for (int i = differenceArray.length - 1; i >= 0; i--) {
        int first = i < tempArray.length ? tempArray[tempArray.length - i - 1] : 0;
        int second = i >= tempArrayTwo.length ?  0 : tempTwoArray[tempTwoArray.length - i - 1];
        int difference = first - second - carry;
        carry = 0;
        if (difference < 0) {
            difference = difference + 10;
            System.out.println(difference);
            carry = 1;
        } 
        subArray[subArray.length - 1 - i] = difference;

我遇到的问题是，数组1的大小为6，总数为46，数组2的大小为3（总数为24），减法将从第一个第24个字符的开头开始数组和第二个数组的第一个元素。

(at the 24th of 46 slot of array One)

00003333 33333333 33333333 array One

10000000 00000000 00000000 arrayTwo

它不是从arrayOne的3和arrayTwo的0开始，而是从arrayOne的0和arrayTwo的1开始。很奇怪，特别是因为它有时会相应地起作用。 fyi表示较大阵列的额外数字。只是这些特殊的数字被搞砸了。

Answer 1

您的问题是如何索引数组

int carry = 0;
int total = Math.max(tempArray.length, tempArrayTwo.length);
int[] subArray = new int[total];
//you want subArray below, not differenceArray
for (int i = subArray.length - 1; i >= 0; i--) {
    int first = i < tempArray.length ? tempArray[tempArray.length - i - 1] : 0;
    //Line above probably should just be int first = tempArray[i];
    int second = i >= tempArrayTwo.length ?  0 : tempTwoArray[tempTwoArray.length - i - 1];
    //Line above probably should just be int second = tempTwoArray[i];
    int difference = first - second - carry;
    carry = 0;
    if (difference < 0) {
        difference = difference + 10;
        System.out.println(difference);
        carry = 1;
    } 
    subArray[subArray.length - 1 - i] = difference;

减去不同长度循环问题的数组

1 个答案: