如何对整数使用charAt之类的东西 [英] How to use something like the charAt for integers

问题描述

我正在尝试制作一个使用三位数的数字来标识项目的程序，并且正在尝试使用诸如charAt方法之类的整数或其他内容.我不太确定.我是一个初学者，对不起，我只需要帮助.我还需要一些帮助来使用if语句和关系运算符.我试图做的是，如果数字中的最后一位数字小于5，则它是{item}，如果数字大于5，则其是这个{item}.这样的事情.提前非常感谢您.

I am trying to make a program that uses three digit numbers to identify items and I am trying to use something like the charAt method for integers or something. Im not too sure. Im a beginner and I apologize i just need help. Also I need a bit of help to use an if statement and relational operators. Im trying to do if the last digit in the number is less than 5 then it is {item} and if its greater than 5 then its this {item}. Something like that. Thank you so much in advance.

    String number;

    System.out.println("Enter three digit number: ");
    number = in.nextLine();

    switch (number.charAt(0))
    {
         //stuff
    }

    if (number > 5)
    {
      //it is this item
    {
    else
    {
      //it is the other item
    {

推荐答案

至少有两种方法可以实现:

There are at least two ways you can do it:

String number = in.nextLine();
char c = number.charAt(i); // i is the position of digit you want to retrieve
int digit = c - '0';

如果要从整数末尾获取第i个数字，请执行以下操作:

if you want to get ith digit from the end of an Integer, do:

int digit = 0;
while(i > 0) {
    digit = n%10;
    n /= 10;
    --i;
}

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