/* 
write a function total_price(double price[], int num_items)  has two parameters
array of doubles (prices) and number of items (integer)
the function reads prices and finds new price for each item prints it and finds and returns
total price using the following discount rules:
if the price <=10 - 5% discount
if the price >10 and price<=20 10%discount
15% discount for all items price>20
write a program that reads a number of items user purchased in the store, num_items 
test function total_price
*/
#include<stdio.h>
#define SIZE 10000
double total_price(double price[], int num_items); //function prototype
int main(){
	double price[SIZE];
	int i,num_items;
	printf("enter number of items\n");
	scanf("%d",&num_items);
	if(num_items>0 && (num_items<=SIZE)){
		
		printf("enter %d prices\n", num_items);
		for(i=0;i<num_items;i++){
			scanf("%lf",&price[i]);
		}
		printf("prices are \n");
		for(i=0;i<num_items;i++){
			printf("%.2f ", price[i]);
		}
		printf("\n");
		printf("total price is %.2f\n",total_price(price, num_items));
	}
	else
		printf("invalid input\n");
	return 0;

}
double total_price(double price[], int num_items){
	int i;
	double new_price, sum=0.0;
	for(i=0;i<num_items;i++){
		if(price[i]<=10)
                	new_price=price[i]*0.95;
                else if(price[i]>10 && price[i]<=20)
                        new_price=price[i]*0.9;
                else
                        new_price=price[i]*0.85;

                printf("new price %.2f\n",new_price);
                sum+=new_price;
         }

	return sum;
}