## util.h
void printLines(int x);

## util.c
#include <stdio.h>
#include "util.h"

void printLines(int x){
	for (int i=0; i<x; i++) {
		printf("Line %d\n", i + 1);
	}
}


## main.c
#include "util.h"
#include <stdio.h>
#define SENTINEL -999

// Declare a structure called Person with 3 members:
// name, telNumber, age
struct Person {
	char name[20];
	char telNumber[11];
	int age;
}User;

// Prototype for function displayPerson
void displayPerson(struct Person c);

int main (int argc, const char * argv[]) {

	// Declare integer
	int nLines = 0, nEntry = 0;
    printf("Please enter the number of lines you require: \n");

	// Request integer from user
	fflush(stdin);
	scanf("%d", &nLines);

	// Check request is greater than zero
	if (nLines > 0) {

		// If greater than 0 perform printLines with
		// requested number of lines as parameter
		printLines(nLines);
	}

	printf("Entering do while loop. Please enter number of times to iterate\n Will print minimum of one time\n");

	// Output to user and take input
	// Break loop once user enters SENTINEL (-999)
	do {
		printf("Integer) Continue -999) Stop \n");
		fflush(stdin);
		scanf("%d", &nEntry);
	} while (nEntry != SENTINEL);


	// Promt for name from user and assign to Person structure
	// User.name
	printf("Please enter your first name for array demonstration\n");
	fflush(stdin);
	scanf("%s", User.name);

	// Display the 2nd letter of the name (array)
	printf("The 2nd letter of your name is: %c\n", User.name[1]);

	// Promt for the age from the user and assign to Person structure
	// User.age   requires address of operator as not an array
	printf("Please enter your age:\n");
	fflush(stdin);
	scanf("%d", &User.age);

	// Prompt for the tel number and assign to Person structure
	// User.telNumber (string to keep leading zero)
	printf("Please enter your Telephone number:\n");
	fflush(stdin);
	scanf("%s", User.telNumber);

	// Call displayPerson using User as parameter
	displayPerson(User);

    return 0;
}

// Function displayPerson declaration
// Takes structure Person as parameter
void displayPerson(struct Person c){

	printf("Outputting information stored in structure\n");

	// Output name member
	printf("Your name is: %s\n",c.name);

	// Output age member
	printf("You are %d years old\n", c.age);

	// Output telNumber member
	printf("Your telephone number is %s\n", c.telNumber);
}