CSCI 159 exam practice sample solutions

CSCI 159: exam practice sample solutions (Mar 22/23 questions)

Question 1: struct definitions

(i) Write the declaration for a struct datatype, ItemData, with three fields:

a character array of size 80, iname, to be used to hold the item name
a float field, iprice, to be used to hold the item price
an integer field, iquantity, to be used to track how many of the item are currently in stock

Sample answer:
struct ItemData {
   char iname[80];
   float iprice;
   int iquantity;
};

(ii) In a main routine, write code to declare a variable of type ItemData and set its field contents to "Fancy Widget", 19.99, and 314.
(Suggestion: strcpy(str, "blah blah blah") can be used to copy a text string into a char array.)

Sample answer:
int main()
{
   ItemData fw;
   strcpy(fw.iname, "Fancy Widget");
   fw.iprice = 19.99;
   fw.iquantity= 314;
}

Question 2: Arrays of structs

Write a function that takes two parameters: an array of ItemData elements and the array size, and for each item in the array displays the item name and the value of the in-stock items (i.e. that item's price times its quantity).

Sample answer:
void displayItems(ItemData items[], int size)
{
   for (int i = 0; i < size; i++) {
       float value = items[i].iprice * items[i].iquantity;
       cout << "Item: " << items[i].iname;
       cout << " has total stock value $" << value << endl;
   }
}