char s[MAX] ={0};        //´æ·ÅÔ´×Ö´®
    char s1[MAX]={0};        //´æ·Å×Ó×Ö´®
    char s2[MAX]={0};        //´æ·ÅÌæ»»×Ö´®
    char result_a[2000] = {0};//´æ·ÅÌæ»»½á¹û;

字符数组同赋初值，所有都是0，相当于'\0'