View Compilation Error

0_0_37601725_28158.cpp: In function 'int main()':
0_0_37601725_28158.cpp:4:12: error: storage size of 's' isn't known
     char s[];
            ^
0_0_37601725_28158.cpp:9:41: error: expected primary-expression before ')' token
         printf("6%s\n", s + strlen(s) - );
                                         ^