strcat函数

char * strcat(char * des, const char *src)

{

    assert((NULL != des) && (NULL != src));

   

    char * result = des;

    while(*des++)

    {

        ;

    }

   

    while((*des++ = *src++) != 0)                //空间不够咋办？

    {

        ;                                                            

    }
    *des = '/0';

 

    return result;

}