将/etc元素与数组中的下一个元素相加/相减

Question

我有一个数组[25,-6,14,7,100]。预期输出为

Sum:        = 140
Difference: = -90
Product:    = -147000

基本上，循环时下一个元素被减/加到当前元素中。求和和乘积很容易，因为我只需要做

for (int i = 0; i < array.length; i++) {
  System.out.println(" => " + i);
  sum += i;
  product *= i;
}

String[] array = [32] // outputs -32

for (int i = 0; i < arrayNumbers.length; i++) {
  System.out.println(arrayNumbers[i] - arrayNumbers[i + 1]);
}

它在线程“main”java.lang.ArrayIndexOutOfBoundsException中给出了异常：索引1超出了长度1的界限

Answer 1

经过一番反复试验，我找到了答案：

int[] array = {25, -6, 14, 7, 100}

int sum = 0;
if (arrayNumbers[0] >= 0) {
  int difference = array[0] + array[0];
} else {
  int difference = array[0] * 2;
}
int product = 1;

for (int i = 0; i < array.length; i++) {
  sum += i;
  difference -= i;
  product *= i;
}

System.out.println("Sum:\t\t= " + sum)                 // Sum:        = 140
System.out.println("Difference:\t= " + difference)     // Difference: = -90
System.out.println("Product:\t= " + product)           // Product:    = 1470000