高精度数组的集大成

做的时候在和高中同学叙叙旧，差点寄掉

代码如下：

#include<stdio.h>
void expand(int len);
const char hexadecimal[17] = "0123456789ABCDEF";
int result[20], mid[20], l_result[100];

int main(void)
{
    char tmp;
    int len, length = 0, len2 = 1;
    scanf("%c %d", &tmp, &len);
    for(int i = 0; i <= 15; i++)
        if(hexadecimal[i] == tmp)
        {
            mid[len - 1] = i;
            break;
        }
    while(mid[len - 1] <= 15)
    {
        int ext = 0, i;
        expand(len);
        for(i = 0; i < len; i++)
        {
            ext += result[i] + mid[i];
            result[i] = ext % 16;
            ext /= 16;
        }
        while(ext)
        {
            ext += result[i];
            result[i++] = ext % 16;
            ext /= 16;
        }
        length = (length > i) ? length : i;
        mid[len - 1]++;
    }
    //转换
    for(int i = length - 1; i >= 0; i--)
    {
        int ext = 0, j;
        for(j = 0; j < len2; j++)
        {
            ext += l_result[j] * 16;
            l_result[j] = ext % 10;
            ext /= 10;
        }
        while(ext)
        {
            ext += l_result[j];
            l_result[j++] = ext % 10;
            ext /= 10;
        }
        len2 = (len2 > j) ? len2 : j;
        ext = result[i], j = 0;
        while(ext)
        {
            ext += l_result[j];
            l_result[j++] = ext % 10;
            ext /= 10;
        }
        len2 = (len2 > j) ? len2 : j;
    }
    //输出
    for(int i = len2 - 1; i >= 0; i--)
        printf("%d", l_result[i]);

    return 0;
}
void expand(int len)
{
    for(int i = len - 2, j = 1; i >= 0; i--, j++)
        mid[i] = (mid[len - 1] + j) % 16;
    return;
}

写的有点草，进制的转换方法我之前写过，就不赘述了