# 三十六进制加法

```public class Solution
{
/**
* num1 num2 为两个三十六进制的数，计算相加结果
* @param num1
* @param num2
* @return
*/
public String add(String num1, String num2)
{
StringBuilder result = new StringBuilder();
int carry = 0;
int len1 = num1.length() - 1;
int len2 = num2.length() - 1;
for(; len1>=0 && len2>=0; len1--, len2--)
{
carry = add(num1, num2, result, carry, len1, len2);
}

while(len1>=0)
{
carry = add(num1, num2, result, carry, len1, len2);
len1--;
}
while(len2>=0)
{
carry = add(num1, num2, result, carry, len1, len2);
len2--;
}
if(carry > 0)
result.append(carry);
System.out.println(result.toString());
return result.reverse().toString();
}

private int add(String num1, String num2, StringBuilder result, int carry, int len1, int len2)
{
int n1 = 0, n2 = 0;
if(len1 >= 0)
{
n1 = getNumByChar(num1.charAt(len1));
}
if(len2 >= 0)
{
n2 = getNumByChar(num2.charAt(len2));
}
int sum = n1 + n2 + carry;
carry = sum / 36;
result.append(getCharByNum(sum % 36));
return carry;
}

public char getCharByNum(int n)
{
if(n<10)
{
return (char)((int)‘0‘ + n);
}
else
{
return (char)((int)‘a‘ + (n-10));
}
}

public int getNumByChar(char c)
{
if(c>=0 && c<=9)
{
return c - ‘0‘;
}
else
{
return (c - ‘a‘) + 10;
}
}

public static void main(String[] args)
{
}

}```

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