View Compilation Error

0_0_27783462_6184.cpp: In function 'int main()':
0_0_27783462_6184.cpp:20:24: error: invalid conversion from 'char' to 'const char*' [-fpermissive]
    if(strncmp(s1,a[j][8],8)==0)
                        ^
In file included from 0_0_27783462_6184.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/string.h:76:15: note: initializing argument 2 of 'int strncmp(const char*, const char*, size_t)'
   int __cdecl strncmp(const char *_Str1,const char *_Str2,size_t _MaxCount);
               ^
0_0_27783462_6184.cpp:27:24: error: invalid conversion from 'char' to 'const char*' [-fpermissive]
    if(strncmp(s2,a[j][8],8)==0)
                        ^
In file included from 0_0_27783462_6184.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/string.h:76:15: note: initializing argument 2 of 'int strncmp(const char*, const char*, size_t)'
   int __cdecl strncmp(const char *_Str1,const char *_Str2,size_t _MaxCount);
               ^