了解嵌套的forloops [英] Understanding nested forloops

问题描述

我想更好地理解嵌套循环。



说我有一个for循环时间，这个实例是一个父循环，如下所示：

Hi,

I am trying to better understand nested loops.

Say I have a for loop for time, this instance a parent loop as follows:

int i;
int j;

for (int i = 0; i <=99; i++)
{
  for (j = 0; i <=99; j++)
  {
    blahh...
  }
}

在这个例子中这是否意味着对于变量i的每次重复，变量j都会被执行？



有点令人困惑。



干杯

Keil

In this instance does this mean that for every repition of variable i, variable j gets executed?

A tad confusing.

Cheers
Keil

推荐答案

内循环中的所有步骤都会在外循环的每次执行时执行。

All the steps in the inner loop gets executed for every single execution of the outer loop.

Quote：

在这种情况下，这是否意味着对于变量i的每次重复，变量j都会被执行？

In this instance does this mean that for every repition of variable i, variable j gets executed?

是的，你是对的。理想情况下应该发生。



对于每一个i，内循环应该持续到j为99.



但你有问题这里。内循环检查条件 i< = 99 ，这是错误的。你应该检查 j< = 99 。

Yes, you are right. Ideally it should happen.

For every i, inner loop should continue till j is 99.

But you have a problem here. The inner loop checks the condition i<=99, which is wrong. You should check j<=99.

for (j = 0; i <=99; j++)

如下所示添加控制台写行，您可以看到每个迭代值的变化方式

add console write line as below, you can see the how each iteration values are changing

for (int i = 0; i <=99; i++)
{
  for (j = 0; j <=99; j++)
  {
    Console.WriteLine(string.Format("i={0}, j={1}", i,j));
  }
}

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