简单的嵌套循环的例子 [英] Simple nested for loop example
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问题描述
在这个循环中:
for(int i = 1 ; i <= 3; i ++){
for(int j = 1; j <= 3; j ++){
System.out.println(i ++ j);
$ b $输出是:
1 1
1 2
1 3
2 1
2 2
2 3
3 1
3 2
3 3
我的问题是,我不明白当我读这段代码的时候,我一直认为它应该看起来像这样:
1 1
2 2
3 3
为什么不是这样?
解决方案每一次我的迭代,你开始一个全新的迭代j。
所以,你开始我== 1,然后循环j == 1,2,3。然后我= 2,然后j = 1,2,3循环,等等。
一步一步,这将是有道理的。
Currently I am studying for my Java test. Whist studying I've come across a small problem.
In this for loop:
for ( int i=1; i <= 3 ; i++ ) {
for (int j=1; j <= 3 ; j++ ) {
System.out.println( i + " " + j );
}
}
The output is:
1 1
1 2
1 3
2 1
2 2
2 3
3 1
3 2
3 3
My problem is, I don't understand it. When I read this code I keep thinking it should look like this:
1 1
2 2
3 3
Why is this not the case?
解决方案 Each iteration of i, you're starting a completely new iteration of j.
So, you start with i==1, then j==1,2,3 in a loop. Then i==2, then j==1,2,3 in a loop, etc.
Step through it one step at a time, and it will make sense.
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