#include <stdio.h>
#include <errno.h>
#include <stdlib.h>

extern int sys_nerr;
extern int errno;

int main()
{
	char buffer[4];

	for (errno = 0; errno < sys_nerr; ++errno)
	{
		sprintf(buffer, "%3d", errno);
		perror(buffer);
	}

	exit(0);
	/* There is not an error message for 0 and there's no point in 
	 * having one. since 0 is used for successful completion. If the 
	 * program terminated correctly the 0 value is enough and 
	 * there's no need for explanations...
	 */

}