设计一个算法完成两个超长正整数的加法

Question

要求实现函数：
void AddLongInteger(char * pcAddend, char * pcAugend, char * pcAddResult);
输入参数：
char * pcAddend：加数
char * pcAugend：被加数
char * pcAddResult：加法结果
返回值：无

我设计了一个函数
void AddLongInteger(char * pcAddend, char * pcAugend, char * pcAddResult)
{
int pcAddend_len = 0,pcAugend_len = 0,pcAddResult_len = 0;
char* temp_s1 = pcAddend,*temp_s2 = pcAugend;
while(*temp_s1)
{
pcAddend_len++;
temp_s1++;
}
while(*temp_s2)
{
pcAugend_len++;
temp_s2++;
}

char temp_pcAddresult[100] = {0};
int carry = 0;
int k=99;
for(int i=pcAddend_len-1,j=pcAugend_len-1;i>=0||j>=0;i--,j--)
{
    int temp_num;
    if (i<0)
    { temp_num = int(pcAugend[j]-'0') + carry; }
    else if (j<0)
    { temp_num = int(pcAddend[i] - '0') + carry; }
    else
    { temp_num = int(pcAddend[i] - '0') + int(pcAugend[j]-'0') + carry; }
    temp_pcAddresult[k--] = (char)(temp_num%10) + '0';
    carry = temp_num/10;
}
temp_pcAddresult[k] = (char)carry + '0';

for(int i=0;i<100;i++)
{
    if (temp_pcAddresult[i]!='0'&&temp_pcAddresult[i]!=0)
    {
        pcAddResult_len = 100-i;
        break;      
    }
}

char* temp_u = pcAddResult;
for(int i=0;i<pcAddResult_len;i++)
{
    *temp_u = temp_pcAddresult[100-pcAddResult_len+i];
    temp_u++;
}

}

但是传不出子函数中的结果，求大神指点！

Answer 1

http://blog.csdn.net/huasonl88/article/details/4436229
http://www.cnblogs.com/caixu/archive/2011/09/27/2192910.html
http://wenku.baidu.com/link?url=KCxtqR15Vf8gYONoFdoguB-muj8Buu1fqco2XTBA1IsCjFEEfQLpOwEgVX0srDrdN-5zR2hD7yVsCJzcrcleK2X2PSNkPvtfgokQLFIG5ii