Question

var numbers = [45, 73, 195, 53]

//Write your code here
 //Replace this comment with your code.
var computedNumbers : [Double] = Array() 
for i in 0...numbers.count-1 {computedNumbers[i] = Double(numbers[i])*Double(numbers[i])}
print(computedNumbers)

当我尝试在快速代码上运行代码时，出现以下错误：致命错误：索引超出范围。我正在尝试通过将数字数组中的每个元素本身相乘来复制double数组。

Answer 1

您的calculatedNumbers数组为空，并且您尝试在for循环中访问为空的calculatedNumbers [i]值。如果要在其中添加数据，请尝试以下方法：

var numbers = [45, 73, 195, 53]

//Write your code here
 //Replace this comment with your code.
var computedNumbers : [Double] = []
for i in 0...numbers.count-1 {
  let num = Double(numbers[i])*Double(numbers[i])
  computedNumbers.append(num)
} 
print(computedNumbers)

为什么由于索引超出范围而导致致命错误？

1 个答案: