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#define NUM_BOOKS 2
#include <stdio.h> //#define _CRTMSECURE_NO_WARNINGS #include <string.h>
 
typedef struct
{
  char title[20];
  char author[20];
  int pages;
} Book;
 
void insertBooks(Book list[], int N)
{
	int i;
	for (i = 0; i < N; i++)
	{
		printf("title? "); scanf_s("%s", list.title);
		printf("author? "); scanf_s("%s", list.author);
		printf("pages? "); scanf_s("%d", &list.pages);
	}
}
 
void printBooks(Book list[], int N) 
{
	int i;
	for (i = 0; i < N; i++)
	{
		printf("title: %s ", list.title);
	    printf("author: %s ", list.author);
		printf("pages: %d \n", list.pages);
	}
}
 
void saveAsFile(Book list[], int N) // save as "output.txt"
{
	FILE* fp = fopen("output.txt", "wt");
	int i;
	for (i = 0; i < N; i++)
		fprintf(fp, "%s %s %d", list.title, list.author, list.pages);
	fclose(fp);
}
 
int main(void) 
{
	Book list[NUM_BOOKS];
	insertBooks(list, NUM_BOOKS); 
	printBooks(list, NUM_BOOKS); 
	saveAsFile(list, NUM_BOOKS);
	return 0;
}
 

prog.cpp: In function ‘void insertBooks(Book*, int)’:
prog.cpp:16:41: error: request for member ‘title’ in ‘list’, which is of pointer type ‘Book*’ (maybe you meant to use ‘->’ ?)
   printf("title? "); scanf_s("%s", list.title);
                                         ^~~~~
prog.cpp:16:46: error: ‘scanf_s’ was not declared in this scope
   printf("title? "); scanf_s("%s", list.title);
                                              ^
prog.cpp:17:42: error: request for member ‘author’ in ‘list’, which is of pointer type ‘Book*’ (maybe you meant to use ‘->’ ?)
   printf("author? "); scanf_s("%s", list.author);
                                          ^~~~~~
prog.cpp:18:42: error: request for member ‘pages’ in ‘list’, which is of pointer type ‘Book*’ (maybe you meant to use ‘->’ ?)
   printf("pages? "); scanf_s("%d", &list.pages);
                                          ^~~~~
prog.cpp: In function ‘void printBooks(Book*, int)’:
prog.cpp:27:29: error: request for member ‘title’ in ‘list’, which is of pointer type ‘Book*’ (maybe you meant to use ‘->’ ?)
   printf("title: %s ", list.title);
                             ^~~~~
prog.cpp:28:33: error: request for member ‘author’ in ‘list’, which is of pointer type ‘Book*’ (maybe you meant to use ‘->’ ?)
      printf("author: %s ", list.author);
                                 ^~~~~~
prog.cpp:29:31: error: request for member ‘pages’ in ‘list’, which is of pointer type ‘Book*’ (maybe you meant to use ‘->’ ?)
   printf("pages: %d \n", list.pages);
                               ^~~~~
prog.cpp: In function ‘void saveAsFile(Book*, int)’:
prog.cpp:38:32: error: request for member ‘title’ in ‘list’, which is of pointer type ‘Book*’ (maybe you meant to use ‘->’ ?)
   fprintf(fp, "%s %s %d", list.title, list.author, list.pages);
                                ^~~~~
prog.cpp:38:44: error: request for member ‘author’ in ‘list’, which is of pointer type ‘Book*’ (maybe you meant to use ‘->’ ?)
   fprintf(fp, "%s %s %d", list.title, list.author, list.pages);
                                            ^~~~~~
prog.cpp:38:57: error: request for member ‘pages’ in ‘list’, which is of pointer type ‘Book*’ (maybe you meant to use ‘->’ ?)
   fprintf(fp, "%s %s %d", list.title, list.author, list.pages);
                                                         ^~~~~

Standard output is empty