递增 for 循环的每隔一次迭代（JAVA）

Question

I want to make a for loop that adds by 1 every other iteration, as long as it doesn't reach a value higher than 5. I've tried with nested forloops but it's still nothing like it.

Eg Given a value x=10 or x=3.

     For i<x && i<=5; i++

and this is where i want a value y, to be added with +1 every other (2th) time it runs the loop.

Thanks in advance.

Answer 1

可以通过添加一个第二可变例如为此s即0上的每个第一和1上的每个第二迭代。

for(int i=0, s=0; i<5; i+=s, s=-s+1)

Answer 2

You can use the % (module) operator in a condition inside the loop with the index variable, like this:

// code where you initialize x and y variables

for (int i=0; i<x && i<=5; i++) {
    if (i % 2 == 0) { // even values for i
        y++; 
    }
}

In this case the loop increments y in the first, third, fifth (.. and so on) iterations. If you want to increment it on the second, fourth, sixth (... and so on), then invert the condition with i % 2 != 0