/* Assignment 4 - Repetition using while					*/
/* CSC 157													*/
/* Author: John Tracey										*/
/* email: jstracey456@yahoo.com								*/
/*		This program asks for the number of customers		*/
/* to purchase zip disks. Each customer's data is entered	*/
/* specifically, the number of disks. If a customer buys	*/
/* more than 10 disks, a 10% discount apples to the entire	*/
/* order. If not, the customer pays $6.95 per disk.	The		*/
/* program prints relevant cost information for each		*/
/* customer and provides summary data for the total order	*/
/* batch.													*/
#include <stdio.h>
int main() {
	/* define double precision variables for cost data		*/
	/* zip_cost is $6.95									*/
	/* total_cost is the total for each individual customer	*/
	/* grand_total_cost is the summary cost for all			*/
	/*    in the batch.										*/
	double grand_total_cost, total_cost, zip_cost;
	/* define integer variables								*/
	/* counter tracks the customer batch size for looping 	*/
	/* total_zip is total for each customer					*/
	/* regular_zip tracks  number of non-discounted disks	*/
	/* discount_zip tracks discounted disks					*/
	/* number_zip tracks total in batch						*/
	/* munber_of_customers is an input for size of batch	*/
	int counter, total_zip, regular_zip, discount_zip, number_zip, number_of_customers;
	/* initialize variables for proper calculation			*/
	grand_total_cost = 0.0;
	counter = 1;			/* initial value for while loop */
	total_zip=0;
	regular_zip=0;
	discount_zip = 0;
	zip_cost = 6.95;
	printf ("How many customers will be handled at this time? ");
	scanf ("%d", &number_of_customers);
	/*		This while loop repeats for the number of customers in the batch and compares the	*/
	/*counter which is initialized at one to the number of customers, which can be any non-zero	*/
	/*value. Inside the loop, if the customer purchases 10 or more disks, a 10% discount applies*/
	/*to the enire order. If less than 10 disks are purchased,the regular price of $6.95 applies*/
 	while (counter <=number_of_customers) {
		printf ("\n\nPlease enter the number of zip disks ordered by customer%4d: ", counter);
		scanf ("%d", &number_zip);
		/* increment total for each customer	*/
		total_zip=total_zip + number_zip;
		/* branch for discount pricing			*/
		if (number_zip >= 10) {	
			total_cost = 0.9*zip_cost*number_zip;		/* caculate discount					*/			
			discount_zip=discount_zip + number_zip;		/*accumulate totals for discounted disks*/
		}
		/* branch for non-discounted disks		*/
		else {
			total_cost = zip_cost*number_zip;			
			regular_zip = regular_zip + number_zip;
		}
		/* print summary data for each customer	*/
		printf ("\n\nCustomer:%4d\t#Zips:%4d\tCost:%6.2f", counter, number_zip, total_cost);
		grand_total_cost = grand_total_cost + total_cost;/* increment total cost for batch		*/
		total_zip = regular_zip + discount_zip;			 /* increment total disks sold per batch*/	
		counter++;								/* increment counter by 1 and repeat while loop	*/
												/* Exit the loop when counter is greater than   */
												/* the number_of_customers.						*/
	}
	/* Print summary data for all customers in the batch	*/
	printf ("\n\nSummary Data:\n");
	printf ("-----------------\n");
	printf ("\tNumber of Zip Disks:                %4d\n", total_zip);
	printf ("\tNumber of Zip Disks Discounted:     %4d\n", discount_zip);
	printf ("\tRevenue from Zip Disks:           %6.2f\n\n", grand_total_cost);

	return 0;
	}