View Compilation Error

0_0_17736976_25302.cpp: In function 'int main()':
0_0_17736976_25302.cpp:15:43: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
             memset(str , "\0" ,sizeof(str));
                                           ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstring:42:0,
                 from 0_0_17736976_25302.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/string.h:43:18: note: initializing argument 2 of 'void* memset(void*, int, size_t)'
   void * __cdecl memset(void *_Dst,int _Val,size_t _Size);
                  ^