Answer to Question #113231 in C for Robin

Question

Note answer in C language only
Create a struct called Invoice that a hardware store might use to represent an invoice
for an item sold at the store. An Invoice should include four data members—a part
number (type string), a part description (type string), a quantity of the item being
purchased (type int) and a price per item (type float). Your program should initialize the
four data members. In addition, it should calculate the invoice amount (i.e., multiplies the
quantity by the price per item), If the quantity is not positive, it should be set to 0. If the
price per item is not positive, it should be set to 0. Write a test program that demonstrates
struct Invoice’s capabilities.
Note: Perform this work using
1. pointer to 2d arrays and design function for calculating the results by passing array to function by value and by
reference.

Answer 1

#include <stdio.h>

struct invoice {
    char partNumber[25];
    char partDescription[25];
    int itemQuantity;
    float itemPrice;
};

float invoice_amount(int quantity, float price) {
    if (quantity < 0) { quantity = 0; }
    return quantity * price;
}

int main() {
    struct invoice Invoice1 = {"ed34", "Screw Guage", 2, 30};
    struct invoice Invoice2 = {"e322", "Screws", 10, 3};
    printf("Invoice1's initial part number is: %s,"
           "\npart description is: %s, "
           "\nquantity per item is: %d, "
           "\nprice per item is: %f, "
           "\ninvoice amount: %f ",
           Invoice1.partNumber,
           Invoice1.partDescription,
           Invoice1.itemQuantity,
           Invoice1.itemPrice,
           invoice_amount(Invoice1.itemQuantity, Invoice1.itemPrice));

    printf("\n\nInvoice2's initial part number is: %s,"
           "\npart description is: %s, "
           "\nquantity per item is: %d, "
           "\nprice per item is: %f, "
           "\ninvoice amount: %f ",
           Invoice2.partNumber,
           Invoice2.partDescription,
           Invoice2.itemQuantity,
           Invoice2.itemPrice,
           invoice_amount(Invoice2.itemQuantity, Invoice2.itemPrice));
    return 0;
}