#include <stdio.h> #include <stdlib.h> int main(void) { char * ptr1 = NULL; char * newptr = NULL; ptr1 = (char *) malloc(8 * sizeof(int)); if (ptr1 == NULL) exit(EXIT_FAILURE...

I have the following DAG (Directed Acyclic Graph) data structure: struct dag { struct dag **children; // Array of pointers to DAGs int n_children; // Number of children }; I want thi...

My question is why i have to assign NULL to pointer after freeing allocated memory? free(*ptr); *ptr = NULL; I mean situation like this, why it is necesssary?

Please help, I can't figure out how to free memory correctly. There is a code below #include <stdio.h> #include <stdlib.h> #include <string.h> #define INT_MSG_LEN 25; enum {NO_ERRO...