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

int main(void)
{
	int age = 1; // Declare variable and initialise to 1

	do {

	printf ("\nPlease enter your age: ");
	scanf("%d", &age);
	printf ("You are %d years old\n", age);

	if (age == 18 || age == 21) {
		printf("You have come of age\n");
	}

	// Code  now goes back and repeats the test with the value of age just entered
	} while ( age != 0); // Loop as long as age is not zero
	return 0; // Exit code
}