我在跟踪数组练习时得到的结果与编译器不同 [英] Im getting a different result than the compiler when tracing array excercise

问题描述

当我跟踪代码获得答案的1,3,5,7时，编译器会打印1,3,6,10
我无法理解这种情况的发生，谁能解释

when i trace the code im getting 1,3,5,7 for the answer but the compiler prints 1,3,6,10
im having trouble understanding how this happens could anyone explain

int [] a= new int[5];  // create array
for (int i =1; i<=4; i++)    
{
  a[i]=a[i-1]+i;
  System.out.print(a[i]+" ");
}

推荐答案

当我 trace 代码

您调试它.调试时，您可以一行计算出几种操作:

when i trace the code

You debug it. While debugging you figure several operations in one line:

for (int i =1; i<=4; i++)    
{
  a[i]=a[i-1]+i;
  System.out.print(a[i]+" ");
}

应该是

should be

for (int i =1; i<=4; i++)    
{
  int iNumber = a[i-1]; // get number of previous field
  iNumber += i; // add counter
  a[i]=iNumber; // place result
  System.out.print(a[i]+" ");
}

这样，您可以计算每个步骤并查看输出是否为"1 3 6 10".

This way you can figure every step and see that the output if this is "1 3 6 10".

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