程序代码：

int mycompress(const char * strin, char * strout)
{
    char curChar = '\0';
    unsigned int i = 0, j=0;
    unsigned int charCount = 0;

    for(i=0; strin[i]!='\0'; i++)
    {
        if((strin[i]>='a' && strin[i]<='z') || (strin[i]>='A' && strin[i]<='Z'))
        {
            //current count
            if(curChar == strin[i])
            {
                charCount++;
            }
            else
            {
                //save old count
                if(curChar != '\0')
                {
                    if(charCount > 1)
                    {
                        j += sprintf(&strout[j], "%c%u", curChar, charCount);
                    }
                    else
                    {
                        j += sprintf(&strout[j], "%c", curChar);
                    }
                }

                //begin new count
                curChar = strin[i];
                charCount=1;
            }
        }
        else
        {
            fprintf(stderr, "format error! %c is not allowed!\n", strin[i]);
            return -1;
        }
    }
    if(curChar != '\0')
    {
        j += sprintf(&strout[j], "%c%u", curChar, charCount);
    }
    strout[j] = '\0';

    return 0;
}


int main(int argc, char * argv[])
{
    char strin[] = "eeeeeaaaff";
    char strout[sizeof(strin)];

    mycompress(strin, strout);
    printf("%s %s\n", strin, strout);
    
    return 0;
}

程序代码：

int main()
{
    char* t="beeettteeaddddaaffhhhhhj";
    char k[100]={'\0'};
    char*p=k;
    int i=0;
    while(*t!='\0')
    {
        *p=*t;
        while(*t!='\0')
        {
            if(*p!=*(++t))
            {
                i++;
                break;
            }
            else i++;
        }
        p++;
        *p++=i+0x30;
        i=0;
    }
    printf("%s\n",k);
    return 0;
}