#include <stdio.h> /*include the standard input output definitions*/

#define OK_NO_PROBLEMS	0 /*this is NOT an instruction - it just says the C pre-processor that OK_NO_PROBLEMS is an alias to zero (0)*/

int hello (FILE *fwhere2print, char *what2print){
	int return_value=0;

	return_value=fprintf (fwhere2print, "%s", what2print);
	if (return_value<0)
		return return_value; /*we had a problem - fprintf returns a negative number if a problem occurs*/
	else
		return OK_NO_PROBLEMS;
};

int main (int number_of_arguments, char *argument_values[]){
	int f=0, return_value=0;

	printf ("This program was called with %d arguments\n", number_of_arguments);
	for (f=0;f<number_of_arguments;f++)
		printf("Argument #%d = %s\n",f,argument_values[f]);

	printf ("But the program does nothing with its arguments :-)\n");

	printf ("Lets just say HELLO WORLD to the standard output...\n");

	return_value=hello (stdout,"HELLO WORLD!\n");

	if (return_value>=OK_NO_PROBLEMS)
		printf ("Program terminates with return code = %d\n",return_value);
	else
		printf ("Oooopsss... there was some problem and the program terminates with an error (return code = %d)\n",return_value);
};