// Pantea Aria

// array of struct - collection of products

// write a program that stores information for 5 products using a struct with two fields:
// id (integer) 
// price (double)
  
// After reading the data, your program should:
// pass the array to a function to calculate the total price of the 5 products.
// display the total

#include <stdio.h>
#define MAX 5

struct product {
    int id;     // id (integer) 
    double price;   // price (double)  
};  
void input(int size, struct product numbers[]);
double calculate(int size, struct product numbers[]);
int main(void) {
    
    // declare an array of size MAX of type product
    struct product products[MAX];
    // read information of 5 products
    input(MAX, products);
    // call calculate, and return the total price
    double total_price = calculate(MAX, products);

    printf ("Total price is %lf\n", total_price);
    return 0;
}       
void input(int size, struct product numbers[]){
    int i = 0;
    printf ("Enter %d product id and price:", size);
    while(i < size) {
        scanf("%d %lf", &numbers[i].id, &numbers[i].price);
        i++;
    }
    return;
}
double calculate(int size, struct product numbers[]) {
    double total = 0;
    int i = 0;
    while(i < size) {
            total = total + numbers[i].price;
            i++;
    }
    return total;
}