1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
int main(int argc, char* argv[]) {
int* a_n = malloc(sizeof(*a_n));
*a_n = 81;
printf("My integer is %d stored at %p\n", *a_n, (void*)a_n);
free(a_n);
a_n = NULL;
// ...
// pitfall: double free
// fix: conditional to make sure it was not freed
// requires setting the address to NULL after freeing
if (a_n != NULL) {
free(a_n);
}
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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