main()
{
int ctr;
struct bookInfo books[3]; // Array of three structure variables
// Get the information about each book from the user
for (ctr = 0; ctr < 3; ctr++)
{
printf("What is the name of the book #%d?\n", (ctr+1));
gets(books[ctr].title);
puts("Who is the author? ");
gets(books[ctr].author);
puts("How much did the book cost? ");
scanf(" $%f", &books[ctr].price);
puts("How many pages in the book? ");
scanf(" %d", &books[ctr].pages);
getchar(); //Clears last newline for next loop
}
// Print a header line and then loop through and print the info
printf("\n\nHere is the collection of books: \n");
for (ctr = 0; ctr < 3; ctr++)
{
printf("#%d: %s by %s", (ctr+1), books[ctr].title,
books[ctr].author);
printf("\nIt is %d pages and costs $%.2f", books[ctr].pages,
books[ctr].price);
printf("\n\n");
}
return(0);
}If you stored the structures on the heap, you couldn’t use the dot operator because the dot operator
requires a variable name. Use -> to store data in heap structures. -> requires a pointer on the left
and a member name on the right. Here is an equivalent program to the previous one, except that the
heap and -> are used instead of structure variables and the dot operator.
Click here to view code image
// Example program #2 from Chapter 27 of Absolute Beginner's Guide
// to C, 3rd Edition
// File Chapter27ex2.c
/* The program again looks to fill three book structures with info,
but it uses a pointer array this time. */
//First include the file with the structure definition
#include "bookinfo.h"
#include <stdio.h>
#include <stdlib.h>
main()
{
int ctr;