这没有IDE连个字符转数字都写得乱七八糟

package top.actim.test09;

import java.util.Iterator;
import java.util.LinkedList;


public class Test03 {
    
    

	public static void main(String[] args) {
    
    
		Test03 test03 = new Test03();
		System.out.println(test03.cal("6shb", "7bs"));
		System.out.println(test03.cal("a", "a"));
		System.out.println(test03.cal("k", "a"));
		System.out.println(test03.cal("u", "a"));
	}
	
	int c2n(char c) {
    
    
		if(c >= '0' && c <= '9') {
    
    
			return c - '0';
		}else {
    
    
			return c - 'a' + 10;
		}
	}
	
	char n2c(int n) {
    
    
		if(n < 10) {
    
    
			return (char)(n + '0');
		}else {
    
    
			return (char)(n + 'a' - 10);
		}
	}
	
	String cal(String a, String b) {
    
    
		
		LinkedList<Character> ans = new LinkedList<>(); 
		
		char[] arr_a = a.toCharArray();
		char[] arr_b = b.toCharArray();
		
		if(arr_a.length < arr_b.length) {
    
    
			char[] temp = arr_a;
			arr_a = arr_b;
			arr_b = temp;
		}
		
		int flag = 0;
		
		for(int i = 0; i < arr_a.length; i++) {
    
    
			// 带进位加
			int sum = c2n(arr_a[arr_a.length - 1 - i]) + c2n(i >= arr_b.length ? '0': arr_b[arr_b.length - 1 - i]) + flag; 
			flag = sum >= 32 ? 1 : 0;
			sum %= 32;
			ans.addFirst(n2c(sum));
		}
		
		if(flag > 0) {
    
    
			ans.addFirst(n2c(flag));
		}
		
		StringBuilder sb = new StringBuilder();
		for (Iterator<Character> iterator = ans.iterator(); iterator.hasNext();) {
    
    
			Character character = (Character) iterator.next();
			sb.append(character);
		}
		
		return sb.toString();
	}

}