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charAt()函数
Java charAt() 方法属于Java String类
charAt() 方法用于返回指定索引处的字符。索引范围为从 0 到 length() - 1。
<> <>语法
public char charAt(int index)
<> <>参数
index – 字符的索引。
<> <>返回值
返回指定索引处的字符。
举个例子：
package 做题; import java.util.Scanner; import javax.naming.StringRefAddr;
public class Main { public static void main(String[] args) { Scanner sc = new
Scanner(System.in); String str = sc.nextLine();
System.out.println(str.charAt(5)); } }
题目：
给定一个字符串 a，请你按照下面的要求输出字符串 b。
给定字符串 a的第一个字符的 ASCII 值加第二个字符的 ASCII 值，得到 b的第一个字符；
给定字符串 a的第二个字符的 ASCII 值加第三个字符的 ASCII 值，得到 b的第二个字符；
…
给定字符串 a的倒数第二个字符的 ASCII 值加最后一个字符的 ASCII 值，得到 b的倒数第二个字符；
给定字符串 a的最后一个字符的 ASCII 值加第一个字符的 ASCII 值，得到 b的最后一个字符。
输入格式
输入共一行，包含字符串 a。注意字符串中可能包含空格。数据保证字符串内的字符的 ASCII 值均不超过 63。
输出格式
输出共一行，包含字符串 b。
数据范围
2≤a的长度≤100
输入样例：
1 2 3
输出样例：
QRRSd import java.util.Scanner; import javax.naming.StringRefAddr; public
class Main { public static void main(String[] args) { Scanner sc = new
Scanner(System.in); String str = sc.nextLine(); String res = ""; for(int i = 0
; i < str.length() ; i ++) res += (char)(str.charAt(i) + str.charAt((i +
1)%str.length())); System.out.println(res); } }
