View Compilation Error

0_0_6090484_20416.cpp: In function `int main()':
0_0_6090484_20416.cpp:30: error: invalid conversion from `int (*)(const c*, const c*)' to `int (*)(const void*, const void*)'
0_0_6090484_20416.cpp:30: error:   initializing argument 4 of `void qsort(void*, size_t, size_t, int (*)(const void*, const void*))'