Question

Project 8 – Populating a struct and saving it.

This is another “switch” assignment. Rather like the scenarios, here you must select someone else's posted .h file, post a claim, and using it, codepopulating their struct with values you choose. Here “populate” means to give each member a value, using assignment operators and strcpy ( ) as needed.

This all assumes you completed Project 7 first! You can't skip ahead on this one.

I populated the Cat fluffy in my example in Project 7. Let's pretend someone else created it so I can do this part.

a. Post a claim for a header file/struct, not your own. As usual, up to two people can claim the same struct, but your solutions (C code) must be different.

b. At the top of your .c file, #include the header file you claimed.

#include “cat.h:

in my case.

c. You must create five instances of the struct you claim. That means I need to create five Cats. (Don't worry, I have nine). So I might code:

Cat fluffy ;

Cat fuzzy ;

Cat stinky ;

Cat gaz ;

Cat biyombo ;

followed by C code in my main function to set the name, color, etc., etc. for each of the five cats.

strcpy( fluffy.color, “calico” ) ;

strcpy( fuzzy.color “gray” ) ;

and so on.

Copy and paste will really make this easier, just make sure the information for every instance of your selected struct is different. No two cats with the same name,. in my example. This is only difficult if you make lots of typos.

d. Save your populated structs – use the fwrite ( ) C library method described in zyBook Chapter 11.6. This chapter deals specifically with binary files, which is what your structs will become when they get written out. General information about opening and closing files is covered in zyBook Chapter 9 as well.

e. Submit your .c code on this assignment.

f. Post your binary file struct output file by attaching it to a reply in the discussion forum. Use the same thread on which you claimed the topic.

So to summarize Project 8:

• Claim someone else's Project 7, (not your own) struct .h file by posting a reply.

• #include that .h file into the main.c you code.

• Code completely populating the members of the struct for five separate instances. (Like my five cats)

• Use fwrite ( ) code to save your populated structs to a binary file.

• Name the file with the name of your struct. In my example. Using cat.h, my binary output file would be cat.dat

• Submit your .c code here

• Post the binary file output file from running your code as a reply to your claim of the .h file. Be sure to attach the file – do not try to in-line it in the post – won't work very well for a binary file.

• I clamied topic Games

• Language C

Answer 1

// File name: cat.h
#ifndef FILECREATOR_H
#define FILECREATOR_H
#define MAX 20
#include <stdio.h>
#include <string.h>

// Defines a structure to store cat name and color
typedef struct
{
char name[MAX];
char color[MAX];
}Cat;// End of structure

// Creates an array of Cats object of size MAX
Cat cats[MAX];
// Record counter
int len = 0;

// Function to check duplicate cat
// if no duplicate record found adds the cat to the list
void addCat(Cat cat)
{
// Loop variable
int c = 0;
// To store duplicate status
int flag = -1;

// Loops till number of records
for(c = 0; c < len; c++)
{
// Checks if current object name is equals to parameter object name
if(strcmp(cats[c].name, cat.name) == 0)
{
// Sets the flag to loop variable
flag = c;
// Stop the loop
break;
}// End of if condition
}// End of for loop

// Checks if flag value is -1 then no duplicate record found
if(flag == -1)
{
// Copies the parameter cat name to current object cat name
strcpy(cats[c].name, cat.name);
// Copies the parameter cat color to current object cat color
strcpy(cats[c].color, cat.color);

// Increase the record counter by one
len = len + 1;
}// End of if condition

// Otherwise duplicate record, display error message
else
printf("\n Duplicate cat name %s not allowed.", cat.name);
}// End of function

// Function to display all Cats information
void showCats()
{
// Loop variable
int c;

// Loops till number of records
for(c = 0; c < len; c++)
// Displays each cat name and color
printf("\n\n Cat Name: %s \n Cat Color: %s", cats[c].name, cats[c].color);
}// End of function

// Function to display all Cats information
void writeCats()
{
// Loop variable
int c;
// Opens a file to write in binary mode
FILE *writeF = fopen("catInfo.txt", "wb+");

// Loops till number of records
for(c = 0; c < len; c++)
// Writes the cats information to file
fwrite(&cats[c], sizeof(Cat), 1, writeF);
// Close the file
fclose(writeF);
}// End of function
#endif

----------------------------------------------------------------------------------------------------------

#include "cat.h"

// main function definition
int main()
{
// Declares objects of Cat
Cat fluffy;
Cat fuzzy;
Cat stinky;
Cat gaz;
Cat biyombo;

// Assigns name and color to cat object
strcpy(fluffy.color, "calico");
strcpy(fluffy.name, "fluffy");
// Calls the function to add the object
addCat(fluffy);

// Assigns name and color to cat object
strcpy(fuzzy.color, "gray");
strcpy(fuzzy.name, "fuzzy");
// Calls the function to add the object
addCat(fuzzy);

// Assigns name and color to cat object
strcpy(stinky.color, "white");
strcpy(stinky.name, "stinky");
// Calls the function to add the object
addCat(stinky);

// Assigns name and color to cat object
strcpy(gaz.color, "black");
strcpy(gaz.name, "gaz");
// Calls the function to add the object
addCat(gaz);

// Assigns name and color to cat object
strcpy(biyombo.color, "red");
strcpy(biyombo.name, "biyombo");
// Calls the function to add the object
addCat(biyombo);

printf("\n Adds a duplicate Cat %s to test: \n", biyombo.name);
Cat duplicate;
// Assigns name and color to cat object
strcpy(duplicate.color, "red");
strcpy(duplicate.name, "biyombo");
// Calls the function to add the object
addCat(duplicate);

// Calls the function to display cats information
showCats();

// Calls the function to write cats information
writeCats();
}// End of main function

Sample Output:

Adds a duplicate Cat biyombo to test:

Duplicate cat name biyombo not allowed.

Cat Name: fluffy
Cat Color: calico

Cat Name: fuzzy
Cat Color: gray

Cat Name: stinky
Cat Color: white

Cat Name: gaz
Cat Color: black

Cat Name: biyombo
Cat Color: red

catInfo.txt file contents

fluffy calico   
fuzzy gray   
stinky white
gaz black
biyombo red