#include <stdio.h>    /* C */
#include <stdlib.h>   /* for getenv, EXIT_SUCCESS, EXIT_FAILURE */

int main()
{
	/* Print the value of $HOME, p. 199. */

	const char *const p = getenv("HOME");
	if (p == NULL) {
		return EXIT_FAILURE;
	}

	printf("%s\n", p);
	return EXIT_SUCCESS;
}