View Compilation Error

0_0_18896856_17279.cpp: In function 'int main()':
0_0_18896856_17279.cpp:15:23: error: invalid conversion from 'char' to 'const char*' [-fpermissive]
         l=strlen(str[i]);
                       ^
In file included from 0_0_18896856_17279.cpp:3:0:
GCC4.9.2/x86_64-w64-mingw32/include/string.h:54:18: note: initializing argument 1 of 'size_t strlen(const char*)'
   size_t __cdecl strlen(const char *_Str);
                  ^