#include <stdlib.h> //getenv, atoi
#include <stdio.h>	//printf

int main()
{
	// pointer to a char
	char *repstext = getenv("reps");
	// atoi reads in the string and converts it to a integer value.
	// This is the tenary operator 'condition ? value_if_true : value_if_false'
	int reps = repstext ? atoi(repstext) : 10;

	char *msg = getenv("msg");
	if (!msg)
		msg = "Hello.";

	for (int i = 0; i < reps; i++)
		printf("%s\n", msg);
}