英文:
How do I split an indice of an array into two different pices, I.E to validate that neither number is odd/even?
问题
我必须检查 roomNumber[i]，如果这两个数字（假设是两位数）都不是偶数，也不是奇数，则才能接受这个数字。还需要判断第二位数字是否不小于第一位数字的两倍。我猜我需要将它们分割成两个不同的整数（a、b），但我不太确定。
英文:
I have to check, roomNumber[i], if BOTH numbers (assuming it's two-digit) are not even, and not odd. Only then can I accept the number. Also need to determine if the second digit is not less than double the first. I assume that I need to some how split these into two different ints (a,b), but I'm not sure.
答案1
得分: 1
如果你假设只有两位数，可以按照以下方式处理：
int[] roomNumbers = new int[] { 12, 34, 56, 67, 78 };
for (int num : roomNumbers) {
int second = num % 10;
int first = (num - second) / 10;
System.out.println("first: " + first + " second: " + second);
}
你可以使用取模（%）运算符来获取第二个数字。要获取第一个数字，你需要减去第二个数字然后除以 10。
现在你可以进一步处理这些数字。
英文:
If you assume that you have only two-digit numbers, you can go with it this way:
int[] roomNumbers = new int[] { 12, 34, 56, 67, 78 };
for (int num : roomNumbers) {
int second = num % 10;
int first = (num - second) / 10;
System.out.println("first: " + first + " second: " + second);
}
You take the second number using the modulo (%) operator. To get the first number, you need to subtract the second number and divide it by 10.
Now you can process those numbers further.
答案2
得分: 0
你的问题与数组无关。我们来重新表述一下：
如何检测一个数字是否为偶数？
你可以搜索一下，很容易就能找到答案。提示：使用取模运算符（%）。
如何判断第二位数字是否不小于第一位数字的两倍？
将其分解成较小的部分：首先，你需要将第一位和第二位数字分开。如果你不知道怎么做，同样可以搜索一下（提示：这与第一个问题非常相似。你可以使用取模运算符和除法（/））。
然后，你需要根据规则进行比较。尝试自己写点代码，看看你能想出什么来。
英文:
Your questions have nothing to do with arrays. Let's reword them:
> How do I test if a number is even?
You can google this and easily find the answer. Hint: use the modulus operator (%).
> How do I test if the second digit is not less than double the first digit
Break this into smaller pieces: First you need to separate out the first and second digit. Again, you can google this if you don't know. (Hint: it's very similar to the first question. You can use the % operator and division (/).
Then you have to compare these according to the rule. Try to write something on your own and see what you can come up with.
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