Unable to free const pointers in C

Question

How can I free a const char*? I allocated new memory using malloc, and when I\'m trying to free it I always receive the error \"incompatible pointe

Answer 1

You cannot free const char * because it is const. Store pointers received from malloc in non-const pointer variables, so that you can pass them to free. You can pass char * arguments to functions taking const char * arguments but opposite is not always true.

void foo (const char *x);
char *ptr = malloc (...);
foo (ptr);
free (ptr);