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#include <iostream>
#include <stdlib.h>
using namespace std;
 
int main() {
  char *p = (char*)malloc(100);
  free(p);
 
  const int *a = (const int*)malloc(sizeof(int) * 10);  
  free(a);
 
  return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:10:9: error: invalid conversion from ‘const void*’ to ‘void*’ [-fpermissive]
   free(a);
         ^
In file included from /usr/include/c++/6/cstdlib:75:0,
                 from /usr/include/c++/6/ext/string_conversions.h:41,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/stdlib.h:444:13: note:   initializing argument 1 of ‘void free(void*)’
 extern void free (void *__ptr) __THROW;
             ^~~~

Standard output is empty